MediaWiki: Wikimedia\Rdbms\Database Class Reference

Stable to override

decodeExpiry ( $expiry, $format=TS_MW)

Decode an expiry time into a DBMS independent format.

delete ( $table, $conds, $fname=__METHOD__)

Delete all rows in a table that match a condition.

deleteJoin ( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname=__METHOD__)

DELETE where the condition is a join.MySQL overrides this to use a multi-table DELETE syntax, in other databases we use sub-selectsFor safety, an empty $conds will not delete everything. If you want to delete all rows where the join condition matches, set $conds=IDatabase::ALL_ROWS.DO NOT put the join condition in $conds.

Parameters

string	$delTable	The table to delete from.
string	$joinTable	The other table.
string	$delVar	The variable to join on, in the first table.
string	$joinVar	The variable to join on, in the second table.
array \| string	$conds	Condition array of field names mapped to variables, ANDed together in the WHERE clause
string	$fname	Calling function name (use METHOD) for logs/profiling

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

doAtomicSection ( $fname, callable $callback, $cancelable=self::ATOMIC_NOT_CANCELABLE)

Perform an atomic section of reversable SQL statements from a callback.

dropTable ( $table, $fname=__METHOD__)

Delete a table.

duplicateTableStructure ( $oldName, $newName, $temporary=false, $fname=__METHOD__)

Creates a new table with structure copied from existing table.Note that unlike most database abstraction functions, this function does not automatically append database prefix, because it works at a lower abstraction level. The table names passed to this function shall not be quoted (this function calls addIdentifierQuotes() when needed).

Parameters

string	$oldName	Name of table whose structure should be copied
string	$newName	Name of table to be created
bool	$temporary	Whether the new table should be temporary
string	$fname	Calling function name

Returns: bool True if operation was successful

Exceptions

RuntimeException

Stable to override

encodeBlob ( $b)

Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted.To insert into such a field, pass the data through this function before passing it to IDatabase::insert().

Parameters

string $b

Returns: string|Blob

Exceptions

Stable to override

encodeExpiry ( $expiry)

Encode an expiry time into the DBMS dependent format.

endAtomic ( $fname=__METHOD__)

Ends an atomic section of SQL statements.

estimateRowCount ( $tables, $var=' *', $conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Estimate the number of rows in dataset.MySQL allows you to estimate the number of rows that would be returned by a SELECT query, using EXPLAIN SELECT. The estimate is provided using index cardinality statistics, and is notoriously inaccurate, especially when large numbers of rows have recently been added or deleted.For DBMSs that don't support fast result size estimation, this function will actually perform the SELECT COUNT(*).Takes the same arguments as IDatabase::select().

Parameters

string \| string[]	$tables	Table name(s)
string	$var	Column for which NULL values are not counted [default "*"]
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select
array \| string	$join_conds	Join conditions

Returns: int Row count

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

explicitTrxActive ()

fieldExists ( $table, $field, $fname=__METHOD__)

Determines whether a field exists in a table.

flushSnapshot ( $fname=__METHOD__, $flush=self::FLUSHING_ONE)

Commit any transaction but error out if writes or callbacks are pending.

freeResult ( $res)

Free a result object returned by query() or select()It's usually not necessary to call this, just use unset() or let the variable holding the result object go out of scope.

Parameters

mixed $res A SQL result

Stable to override

getDBname ()

Get the current DB name.

getDomainID ()

Return the currently selected domain ID.

getFlag ( $flag)

Returns a boolean whether the flag $flag is set for this connection.

getInfinity ()

Find out when 'infinity' is.Most DBMSes support this. This is a special keyword for timestamps in PostgreSQL, and works with CHAR(14) as well because "i" sorts after all numbers.

Returns: string

Stable to override

getLag ()

Get the amount of replication lag for this database server.

getLBInfo ( $name=null)

Get properties passed down from the server info array of the load balancer.

getMasterPos ()

Get the position of this master.

Returns: DBMasterPos|bool False if this is not a master

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

getReplicaPos ()

Get the replication position of this replica DB.

Returns: DBMasterPos|bool False if this is not a replica DB

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

getScopedLockAndFlush ( $lockKey, $fname, $timeout)

Acquire a named lock, flush any transaction, and return an RAII style unlocker object.

getServer ()

Get the server hostname or IP address.

getServerInfo ()

Get a human-readable string describing the current software version.

getServerUptime ()

Determines how long the server has been up.

Returns: int

Exceptions

Stable to override

getSessionLagStatus ()

Get the replica DB lag when the current transaction started or a general lag estimate if not transaction is active.

getTopologyRole ()

Get the replication topology role of this server.

getTopologyRootMaster ()

Get the host (or address) of the root master server for the replication topology.

ignoreIndexClause ( $index)

IGNORE INDEX clause.

implicitOrderby ()

Returns true if this database does an implicit order by when the column has an index For example: SELECT page_title FROM page LIMIT 1.

Returns: bool

Stable to override

indexExists ( $table, $index, $fname=__METHOD__)

Determines whether an index exists.

indexInfo ( $table, $index, $fname=__METHOD__)

Get information about an index into an object.

indexUnique ( $table, $index, $fname=__METHOD__)

Determines if a given index is unique.

Parameters

string	$table
string	$index
string	$fname	Calling function name

Returns: bool

Stable to override

initConnection ()

Initialize the connection to the database over the wire (or to local files)

insert ( $table, $rows, $fname=__METHOD__, $options=[])

Insert the given row(s) into a table.

insertSelect ( $destTable, $srcTable, $varMap, $conds, $fname=__METHOD__, $insertOptions=[], $selectOptions=[], $selectJoinConds=[])

INSERT SELECT wrapper.

isOpen ()

isQuotedIdentifier ( $name)

Returns if the given identifier looks quoted or not according to the database convention for quoting identifiers.

isReadOnly ()

lastDoneWrites ()

Get the last time the connection may have been used for a write query.

lastQuery ()

Get the last query that sent on account of IDatabase::query()

limitResult ( $sql, $limit, $offset=false)

Construct a LIMIT query with optional offset.The SQL should be adjusted so that only the first $limit rows are returned. If $offset is provided as well, then the first $offset rows should be discarded, and the next $limit rows should be returned. If the result of the query is not ordered, then the rows to be returned are theoretically arbitrary.$sql is expected to be a SELECT, if that makes a difference.

Parameters

string	$sql	SQL query we will append the limit too
int	$limit	The SQL limit
int \| bool	$offset	The SQL offset (default false)

Returns: string

Since: 1.34

Stable to override

listTables ( $prefix=null, $fname=__METHOD__)

List all tables on the database.

Parameters

string \| null	$prefix	Only show tables with this prefix, e.g. mw_
string	$fname	Calling function name

Exceptions

Referenced by Wikimedia\Rdbms\Database\buildGroupConcatField(), Wikimedia\Rdbms\Database\buildLike(), Wikimedia\Rdbms\Database\buildSuperlative(), Wikimedia\Rdbms\DatabaseMysqlBase\lock(), Wikimedia\Rdbms\DatabaseMysqlBase\lockIsFree(), Wikimedia\Rdbms\Database\makeList(), Wikimedia\Rdbms\DatabaseMysqlBase\masterPosWait(), Wikimedia\Rdbms\DatabaseMysqlBase\open(), Wikimedia\Rdbms\Database\replaceVars(), and Wikimedia\Rdbms\DatabaseMysqlBase\unlock().

Returns: array

Stable to override

listViews ( $prefix=null, $fname=__METHOD__)

Lists all the VIEWs in the database.

Parameters

string \| null	$prefix	Only show VIEWs with this prefix, eg. unit_test_
string	$fname	Name of calling function

Exceptions

RuntimeException

Returns: array

Stable to override

lock ( $lockName, $method, $timeout=5)

Acquire a named lock.Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to aquire
string	$method	Name of the calling method
int	$timeout	Acquisition timeout in seconds (0 means non-blocking)

Returns: bool Success

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

lockForUpdate ( $table, $conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Lock all rows meeting the given conditions/options FOR UPDATE.

lockIsFree ( $lockName, $method)

Check to see if a named lock is not locked by any thread (non-blocking)

Parameters

string	$lockName	Name of lock to poll
string	$method	Name of method calling us

Returns: bool

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.20

Stable to override

lockTables (array $read, array $write, $method)

Lock specific tables.

makeList (array $a, $mode=self::LIST_COMMA)

Makes an encoded list of strings from an array.

makeWhereFrom2d ( $data, $baseKey, $subKey)

Build a partial where clause from a 2-d array such as used for LinkBatch.

masterPosWait (DBMasterPos $pos, $timeout)

Wait for the replica DB to catch up to a given master position.Note that this does not start any new transactions. If any existing transaction is flushed, and this is called, then queries will reflect the point the DB was synced up to (on success) without interference from REPEATABLE-READ snapshots.

Parameters

DBMasterPos	$pos
int	$timeout	The maximum number of seconds to wait for synchronisation

Returns: int|null Zero if the replica DB was past that position already, greater than zero if we waited for some period of time, less than zero if it timed out, and null on error

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

maxListLen ()

Return the maximum number of items allowed in a list, or 0 for unlimited.

Returns: int

Stable to override

namedLocksEnqueue ()

Check to see if a named lock used by lock() use blocking queues.

Returns: bool

Since: 1.26

Stable to override

newSelectQueryBuilder ()

Create an empty SelectQueryBuilder which can be used to run queries against this connection.

Returns: SelectQueryBuilder

nextSequenceValue ( $seqName)

Deprecated method, calls should be removed.

onAtomicSectionCancel (callable $callback, $fname=__METHOD__)

Run a callback when the atomic section is cancelled.

onTransactionCommitOrIdle (callable $callback, $fname=__METHOD__)

Run a callback as soon as there is no transaction pending.

onTransactionIdle (callable $callback, $fname=__METHOD__)

Alias for onTransactionCommitOrIdle() for backwards-compatibility.

onTransactionPreCommitOrIdle (callable $callback, $fname=__METHOD__)

Run a callback before the current transaction commits or now if there is none.

onTransactionResolution (callable $callback, $fname=__METHOD__)

Run a callback as soon as the current transaction commits or rolls back.

pendingWriteAndCallbackCallers ()

List the methods that have write queries or callbacks for the current transaction.

pendingWriteCallers ()

Get the list of method names that did write queries for this transaction.

pendingWriteQueryDuration ( $type=self::ESTIMATE_TOTAL)

Get the time spend running write queries for this transaction.

pendingWriteRowsAffected ()

Get the number of affected rows from pending write queries.

ping (&$rtt=null)

Ping the server and try to reconnect if it there is no connection.

preCommitCallbacksPending ()

query ( $sql, $fname=__METHOD__, $flags=self::QUERY_NORMAL)

Run an SQL query and return the result.

replace ( $table, $uniqueKeys, $rows, $fname=__METHOD__)

Insert row(s) into a table, deleting all conflicting rows beforehand.

reportQueryError ( $error, $errno, $sql, $fname, $ignore=false)

Report a query error.

restoreFlags ( $state=self::RESTORE_PRIOR)

Restore the flags to their prior state before the last setFlag/clearFlag call.

rollback ( $fname=__METHOD__, $flush=self::FLUSHING_ONE)

Rollback a transaction previously started using begin()

runOnTransactionIdleCallbacks ( $trigger)

Actually consume and run any "on transaction idle/resolution" callbacks.

runOnTransactionPreCommitCallbacks ()

Actually consume and run any "on transaction pre-commit" callbacks.

runTransactionListenerCallbacks ( $trigger)

Actually run any "transaction listener" callbacks.

select ( $table, $vars, $conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Execute a SELECT query constructed using the various parameters provided.

selectDB ( $db)

Change the current database.

selectDomain ( $domain)

Set the current domain (database, schema, and table prefix)

selectField ( $table, $var, $cond='', $fname=__METHOD__, $options=[], $join_conds=[])

A SELECT wrapper which returns a single field from a single result row.

selectFieldValues ( $table, $var, $cond='', $fname=__METHOD__, $options=[], $join_conds=[])

A SELECT wrapper which returns a list of single field values from result rows.

selectRow ( $table, $vars, $conds, $fname=__METHOD__, $options=[], $join_conds=[])

Wrapper to IDatabase::select() that only fetches one row (via LIMIT)

selectRowCount ( $tables, $var=' *', $conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Get the number of rows in dataset.

selectSQLText ( $table, $vars, $conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Take the same arguments as IDatabase::select() and return the SQL it would use.This can be useful for making UNION queries, where the SQL text of each query is needed. In general, however, callers outside of Database classes should just use select().

See also: IDatabase::select()

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
string \| array	$join_conds	Join conditions

Returns: string SQL query string

Stable to override

serverIsReadOnly ()

Returns: bool Whether the DB is marked as read-only server-side

Since: 1.28

Stable to override

setBigSelects ( $value=true)

Allow or deny "big selects" for this session only.This is done by setting the sql_big_selects session variable.This is a MySQL-specific feature.

Parameters

bool | string $value True for allow, false for deny, or "default" to restore the initial value

Stable to override

setFlag ( $flag, $remember=self::REMEMBER_NOTHING)

Set a flag for this connection.

setIndexAliases (array $aliases)

Convert certain index names to alternative names before querying the DB.Note that this applies to indexes regardless of the table they belong to.This can be employed when an index was renamed X => Y in code, but the new Y-named indexes were not yet built on all DBs. After all the Y-named ones are added by the DBA, the aliases can be removed, and then the old X-named indexes dropped.

Parameters

string[] $aliases

Since: 1.31

Stable to override

setLBInfo ( $nameOrArray, $value=null)

Set the entire array or a particular key of the managing load balancer info array.

setLogger (LoggerInterface $logger)

Set the PSR-3 logger interface to use for query logging.

setSchemaVars ( $vars)

Set schema variables to be used when streaming commands from SQL files or stdin.

setSessionOptions (array $options)

Override database's default behavior.$options include: 'connTimeout' : Set the connection timeout value in seconds. May be useful for very long batch queries such as full-wiki dumps, where a single query reads out over hours or days.

Parameters

array $options

Returns: void

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

setTableAliases (array $aliases)

Make certain table names use their own database, schema, and table prefix when passed into SQL queries pre-escaped and without a qualified database name.For example, "user" can be converted to "myschema.mydbname.user" for convenience. Appearances like user, somedb.user, somedb.someschema.user will used literally.Calling this twice will completely clear any old table aliases. Also, note that callers are responsible for making sure the schemas and databases actually exist.

Parameters

array[] $aliases Map of (table => (dbname, schema, prefix) map)

Since: 1.28

Stable to override

setTransactionListener ( $name, callable $callback=null)

Run a callback after each time any transaction commits or rolls back.

setTrxEndCallbackSuppression ( $suppress)

Whether to disable running of post-COMMIT/ROLLBACK callbacks.

sourceFile ( $filename, callable $lineCallback=null, callable $resultCallback=null, $fname=false, callable $inputCallback=null)

Read and execute SQL commands from a file.

sourceStream ( $fp, callable $lineCallback=null, callable $resultCallback=null, $fname=__METHOD__, callable $inputCallback=null)

Read and execute commands from an open file handle.

startAtomic ( $fname=__METHOD__, $cancelable=self::ATOMIC_NOT_CANCELABLE)

Begin an atomic section of SQL statements.

streamStatementEnd (&$sql, &$newLine)

Called by sourceStream() to check if we've reached a statement end.

strencode ( $s)

Wrapper for addslashes()

strreplace ( $orig, $old, $new)

Returns a SQL expression for simple string replacement (e.g.REPLACE() in mysql)

Parameters

string	$orig	Column to modify
string	$old	Column to seek
string	$new	Column to replace with

Returns: string

Stable to override

tableExists ( $table, $fname=__METHOD__)

Query whether a given table exists.

tableLocksHaveTransactionScope ()

Checks if table locks acquired by lockTables() are transaction-bound in their scope.

tableName ( $name, $format='quoted')

Format a table name ready for use in constructing an SQL query.This does two important things: it quotes the table names to clean them up, and it adds a table prefix if only given a table name with no quotes.All functions of this object which require a table name call this function themselves. Pass the canonical name to such functions. This is only needed when calling query() directly.

Note: This function does not sanitize user input. It is not safe to use this function to escape user input.

Parameters

string	$name	Database table name
string	$format	One of: quoted - Automatically pass the table name through addIdentifierQuotes() so that it can be used in a query. raw - Do not add identifier quotes to the table name

Returns: string Full database name

Stable to override

tableNames (... $tables)

Fetch a number of table names into an array This is handy when you need to construct SQL for joins.

tableNamesN (... $tables)

Fetch a number of table names into an zero-indexed numerical array This is handy when you need to construct SQL for joins.

tablePrefix ( $prefix=null)

Get/set the table prefix.

textFieldSize ( $table, $field)

Returns the size of a text field, or -1 for "unlimited".

Parameters

string	$table
string	$field

Returns: int

Stable to override

timestamp ( $ts=0)

Convert a timestamp in one of the formats accepted by ConvertibleTimestamp to the format used for inserting into timestamp fields in this DBMS.The result is unquoted, and needs to be passed through addQuotes() before it can be included in raw SQL.

Parameters

string | int $ts

Returns: string

Stable to override

timestampOrNull ( $ts=null)

Convert a timestamp in one of the formats accepted by ConvertibleTimestamp to the format used for inserting into timestamp fields in this DBMS.

truncate ( $tables, $fname=__METHOD__)

Delete all data in a table(s) and reset any sequences owned by that table(s)

trxLevel ()

Gets the current transaction level.

trxStatus ()

trxTimestamp ()

Get the UNIX timestamp of the time that the transaction was established.

unionConditionPermutations ( $table, $vars, array $permute_conds, $extra_conds='', $fname=__METHOD__, $options=[], $join_conds=[])

Construct a UNION query for permutations of conditions.

unionQueries ( $sqls, $all)

Construct a UNION query.This is used for providing overload point for other DB abstractions not compatible with the MySQL syntax.

Parameters

array	$sqls	SQL statements to combine
bool	$all	Either IDatabase::UNION_ALL or IDatabase::UNION_DISTINCT

Returns: string SQL fragment

Stable to override

unionSupportsOrderAndLimit ()

Determine if the RDBMS supports ORDER BY and LIMIT for separate subqueries within UNION.

Returns: bool

Stable to override

unlock ( $lockName, $method)

Release a lock.Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to release
string	$method	Name of the calling method

Returns: bool Success

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

unlockTables ( $method)

Unlock all tables locked via lockTables()

update ( $table, $set, $conds, $fname=__METHOD__, $options=[])

Update all rows in a table that match a given condition.

upsert ( $table, array $rows, $uniqueKeys, array $set, $fname=__METHOD__)

Upsert the given row(s) into a table.

useIndexClause ( $index)

USE INDEX clause.

wasConnectionError ( $errno)

Do not use this method outside of Database/DBError classes.

wasConnectionLoss ()

Determines if the last query error was due to a dropped connection.Note that during a connection loss, the prior transaction will have been lost

Returns: bool

Since: 1.31

Stable to override

wasDeadlock ()

Determines if the last failure was due to a deadlock.Note that during a deadlock, the prior transaction will have been lost

Returns: bool

Stable to override

wasErrorReissuable ()

Determines if the last query error was due to something outside of the query itself.

wasLockTimeout ()

Determines if the last failure was due to a lock timeout.Note that during a lock wait timeout, the prior transaction will have been lost

Returns: bool

Stable to override

wasReadOnlyError ()

Determines if the last failure was due to the database being read-only.

Returns: bool

Stable to override

writesOrCallbacksPending ()

Whether there is a transaction open with either possible write queries or unresolved pre-commit/commit/resolution callbacks pending.

writesPending ()

Public Member Functions inherited from Wikimedia\Rdbms\IDatabase

buildSubString ( $input, $startPosition, $length=null)

Build a SUBSTRING function.

dataSeek ( $res, $row)

Change the position of the cursor in a result object.

fetchObject ( $res)

Fetch the next row from the given result object, in object form.

fetchRow ( $res)

Fetch the next row from the given result object, in associative array form.

fieldName ( $res, $n)

Get a field name in a result object.

getServerVersion ()

A string describing the current software version, like from mysql_get_server_info()

getSoftwareLink ()

Returns a wikitext style link to the DB's website (e.g.

getType ()

Get the type of the DBMS (e.g.

insertId ()

Get the inserted value of an auto-increment row.

lastErrno ()

Get the last error number.

lastError ()

Get a description of the last error.

numFields ( $res)

Get the number of fields in a result object.

numRows ( $res)

Get the number of rows in a query result.

Public Member Functions inherited from Wikimedia\Rdbms\IMaintainableDatabase

fieldInfo ( $table, $field)

mysql_fetch_field() wrapper Returns false if the field doesn't exist

Static Public Member Functions
static	attributesFromType ( $dbType, $driver=null)

static	factory ( $type, $params=[], $connect=self::NEW_CONNECTED)
	Construct a Database subclass instance given a database type and parameters.

static	getCacheSetOptions (IDatabase $db1, IDatabase $db2=null)
	Merge the result of getSessionLagStatus() for several DBs using the most pessimistic values to estimate the lag of any data derived from them in combination.

Protected Member Functions
	assertBuildSubstringParams ( $startPosition, $length)
	Check type and bounds for parameters to self::buildSubstring()

	assertConditionIsNotEmpty ( $conds, string $fname, bool $deprecate)
	Check type and bounds conditions parameters for update.

	assertHasConnectionHandle ()
	Make sure there is an open connection handle (alive or not) as a sanity check.

	assertIsWritableMaster ()
	Make sure that this server is not marked as a replica nor read-only as a sanity check.

	buildSuperlative ( $sqlfunc, $fields, $values)
	Build a superlative function statement comparing columns/values.

	closeConnection ()
	Closes underlying database connection.

	doBegin ( $fname)
	Issues the BEGIN command to the database server.

	doCommit ( $fname)
	Issues the COMMIT command to the database server.

	doDropTable ( $table, $fname)

	doGetLag ()
	Stable to override

	doHandleSessionLossPreconnect ()
	Reset any additional subclass trx* and session* fields Stable to override.

	doInitConnection ()
	Actually connect to the database over the wire (or to local files)

	doInsert ( $table, array $rows, $fname)

	doInsertNonConflicting ( $table, array $rows, $fname)

	doInsertSelectGeneric ( $destTable, $srcTable, array $varMap, $conds, $fname, array $insertOptions, array $selectOptions, $selectJoinConds)
	Implementation of insertSelect() based on select() and insert()

	doInsertSelectNative ( $destTable, $srcTable, array $varMap, $conds, $fname, array $insertOptions, array $selectOptions, $selectJoinConds)
	Native server-side implementation of insertSelect() for situations where we don't want to select everything into memory.

	doLockTables (array $read, array $write, $method)
	Helper function for lockTables() that handles the actual table locking.

	doQuery ( $sql)
	Run a query and return a DBMS-dependent wrapper or boolean.

	doReleaseSavepoint ( $identifier, $fname)
	Release a savepoint.

	doReplace ( $table, array $uniqueKeys, array $rows, $fname)

	doRollback ( $fname)
	Issues the ROLLBACK command to the database server.

	doRollbackToSavepoint ( $identifier, $fname)
	Rollback to a savepoint.

	doSavepoint ( $identifier, $fname)
	Create a savepoint.

	doSelectDomain (DatabaseDomain $domain)
	Stable to override.

	doTruncate (array $tables, $fname)

	doUnlockTables ( $method)
	Helper function for unlockTables() that handles the actual table unlocking.

	doUpsert ( $table, array $rows, array $uniqueKeys, array $set, $fname)

	escapeLikeInternal ( $s, $escapeChar='`')
	Stable to override.

	executeQuery ( $sql, $fname, $flags)
	Execute a query, retrying it if there is a recoverable connection loss.

	extractSingleFieldFromList ( $var)

	fetchAffectedRowCount ()

	fieldHasBit ( $field, $flags)

	fieldNamesWithAlias ( $fields)
	Gets an array of aliased field names.

	fieldNameWithAlias ( $name, $alias=false)
	Get an aliased field name e.g.

	getApproximateLagStatus ()
	Get a replica DB lag estimate for this server at the start of a transaction.

	getBindingHandle ()
	Get the underlying binding connection handle.

	getDefaultSchemaVars ()
	Get schema variables to use if none have been set via setSchemaVars().

	getLastPHPError ()

	getLazyMasterHandle ()
	Get a handle to the master server of the cluster to which this server belongs.

	getLogContext (array $extras=[])
	Create a log context to pass to PSR-3 logger functions.

	getQueryVerb ( $sql)

	getReadOnlyReason ()

	getRecordedTransactionLagStatus ()
	Get the replica DB lag when the current transaction started.

	getSchemaVars ()
	Get schema variables.

	getTempTableWrites ( $sql, $pseudoPermanent)

	getTransactionRoundId ()

	indexName ( $index)
	Allows for index remapping in queries where this is not consistent across DBMS.

	installErrorHandler ()
	Set a custom error handler for logging errors during database connection.

	isFlagInOptions ( $option, array $options)

	isInsertSelectSafe (array $insertOptions, array $selectOptions)
	Stable to override.

	isPristineTemporaryTable ( $table)
	Check if the table is both a TEMPORARY table and has not yet received CRUD operations.

	isTransactableQuery ( $sql)
	Determine whether a SQL statement is sensitive to isolation level.

	isWriteQuery ( $sql, $flags)
	Determine whether a query writes to the DB.

	makeConditionCollidesUponKeys (array $rows, array $uniqueKeys)

	makeGroupByWithHaving ( $options)
	Returns an optional GROUP BY with an optional HAVING.

	makeInsertLists (array $rows)
	Make SQL lists of columns, row tuples for INSERT/VALUES expressions.

	makeInsertNonConflictingVerbAndOptions ()
	Stable to override.

	makeOrderBy ( $options)
	Returns an optional ORDER BY.

	makeSelectOptions (array $options)
	Returns an optional USE INDEX clause to go after the table, and a string to go at the end of the query.

	makeUpdateOptions ( $options)
	Make UPDATE options for the Database::update function.

	makeUpdateOptionsArray ( $options)
	Make UPDATE options array for Database::makeUpdateOptions.

	newExceptionAfterConnectError ( $error)

	normalizeConditions ( $conds, $fname)

	normalizeOptions ( $options)

	normalizeRowArray (array $rowOrRows)

	normalizeUpsertKeys ( $uniqueKeys)

	open ( $server, $user, $password, $dbName, $schema, $tablePrefix)
	Open a new connection to the database (closing any existing one)

	qualifiedTableComponents ( $name)
	Get the table components needed for a query given the currently selected database.

	registerTempWrites ( $ret, array $changes)

	relationSchemaQualifier ()
	Stable to override.

	replaceLostConnection ( $fname)
	Close any existing (dead) database connection and open a new connection.

	replaceVars ( $ins)
	Database independent variable replacement.

	restoreErrorHandler ()
	Restore the previous error handler and return the last PHP error for this DB.

	resultObject ( $result)
	Take a query result and wrap it in an iterable result wrapper if necessary.

	tableNamesWithIndexClauseOrJOIN ( $tables, $use_index=[], $ignore_index=[], $join_conds=[])
	Get the aliased table name clause for a FROM clause which might have a JOIN and/or USE INDEX or IGNORE INDEX clause.

	tableNameWithAlias ( $table, $alias=false)
	Get an aliased table name.

	wasKnownStatementRollbackError ()
	Stable to override.

	wasQueryTimeout ( $error, $errno)
	Checks whether the cause of the error is detected to be a timeout.

Static Protected Member Functions
static	getAttributes ()
	Stable to override.

Protected Attributes
integer null	$affectedRowCount
	Rows affected by the last query to query() or its CRUD wrappers.

string	$agent
	Agent name for query profiling.

bool	$cliMode
	Whether this PHP instance is for a CLI script.

object resource null	$conn
	Database connection.

array	$connectionParams
	Parameters used by initConnection() to establish a connection.

string[] int[] float[]	$connectionVariables
	SQL variables values to use for all new connections.

LoggerInterface	$connLogger

DatabaseDomain	$currentDomain

string	$delimiter = ';'
	Current SQL query delimiter.

callable	$deprecationLogger
	Deprecation logging callback.

callable	$errorLogger
	Error logging callback.

int	$flags
	Current bit field of class DBO_* constants.

string[]	$indexAliases = []
	Current map of (index alias => index)

array	$lbInfo = []
	Current LoadBalancer tracking information.

int	$nonNativeInsertSelectBatchSize
	Row batch size to use for emulated INSERT SELECT queries.

string	$password
	Password used to establish the current connection.

callable null	$profiler

LoggerInterface	$queryLogger

LoggerInterface	$replLogger

array null	$schemaVars
	Current variables use for schema element placeholders.

string	$server
	Server that this instance is currently connected to.

array	$sessionDirtyTempTables = []
	Map of (table name => 1) for current TEMPORARY tables.

array	$sessionNamedLocks = []
	Map of (name => 1) for locks obtained via lock()

array	$sessionTempTables = []
	Map of (table name => 1) for current TEMPORARY tables.

BagOStuff	$srvCache
	APC cache.

array[]	$tableAliases = []
	Current map of (table => (dbname, schema, prefix) map)

string	$topologyRole
	Replication topology role of the server; one of the class ROLE_* constants.

string null	$topologyRootMaster
	Host (or address) of the root master server for the replication topology.

TransactionProfiler	$trxProfiler

string	$user
	User that this instance is currently connected under the name of.

Static Protected Attributes
static int	$DBO_MUTABLE
	Bit field of all DBO_* flags that can be changed after connection.

static string[]	$MUTABLE_FLAGS
	List of DBO_* flags that can be changed after connection.

Private Member Functions
	assertQueryIsCurrentlyAllowed ( $sql, $fname)
	Error out if the DB is not in a valid state for a query via query()

	beginIfImplied ( $sql, $fname)
	Start an implicit transaction if DBO_TRX is enabled and no transaction is active.

	canRecoverFromDisconnect ( $sql, $priorWritesPending)
	Determine whether it is safe to retry queries after a database connection is lost.

	consumeTrxShortId ()
	Reset the transaction ID and return the old one.

	currentAtomicSectionId ()

	executeQueryAttempt ( $sql, $commentedSql, $isPermWrite, $fname, $flags)
	Wrapper for doQuery() that handles DBO_TRX, profiling, logging, affected row count tracking, and reconnects (without retry) on query failure due to connection loss.

	flatAtomicSectionList ()

	getQueryException ( $error, $errno, $sql, $fname)

	getQueryExceptionAndLog ( $error, $errno, $sql, $fname)

	handleSessionLossPostconnect ()
	Clean things up after session (and thus transaction) loss after reconnect.

	handleSessionLossPreconnect ()
	Clean things up after session (and thus transaction) loss before reconnect.

	makeConditionCollidesUponKey (array $rows, array $uniqueKey)

	modifyCallbacksForCancel (array $sectionIds, AtomicSectionIdentifier $newSectionId=null)
	Update callbacks that were owned by cancelled atomic sections.

	nextSavepointId ( $fname)

	pingAndCalculateLastTrxApplyTime ()

	prependDatabaseOrSchema ( $namespace, $relation, $format)

	reassignCallbacksForSection (AtomicSectionIdentifier $old, AtomicSectionIdentifier $new)
	Hoist callback ownership for callbacks in a section to a parent section.

	runOnAtomicSectionCancelCallbacks ( $trigger, array $sectionIds=null)
	Actually run any "atomic section cancel" callbacks.

	selectFieldsOrOptionsAggregate ( $fields, $options)

	selectOptionsIncludeLocking ( $options)

	updateTrxWriteQueryTime ( $sql, $runtime, $affected)
	Update the estimated run-time of a query, not counting large row lock times.

Static Private Member Functions
static	getClass ( $dbType, $driver=null)

Private Attributes
string bool null	$htmlErrors
	Stashed value of html_errors INI setting.

string bool	$lastPhpError = false

float	$lastPing = 0.0
	UNIX timestamp.

string	$lastQuery = ''
	The last SQL query attempted.

float	$lastRoundTripEstimate = 0.0
	Query round trip time estimate.

float bool	$lastWriteTime = false
	UNIX timestamp of last write query.

IDatabase null	$lazyMasterHandle
	Lazy handle to the master DB this server replicates from.

int null	$ownerId
	Integer ID of the managing LBFactory instance or null if none.

int[]	$priorFlags = []
	Prior flags member variable values.

int	$trxAtomicCounter = 0
	Counter for atomic savepoint identifiers (reset with each transaction)

array	$trxAtomicLevels = []
	List of (name, unique ID, savepoint ID) for each active atomic section level.

bool	$trxAutomatic = false
	Whether the current transaction was started implicitly due to DBO_TRX.

bool	$trxAutomaticAtomic = false
	Whether the current transaction was started implicitly by startAtomic()

bool	$trxDoneWrites = false
	Whether possible write queries were done in the last transaction started.

array[]	$trxEndCallbacks = []
	List of (callable, method name, atomic section id) -var array<array{0:callable,1:string,2:AtomicSectionIdentifier\|null}>

bool	$trxEndCallbacksSuppressed = false
	Whether to suppress triggering of transaction end callbacks.

string	$trxFname = null
	Name of the function that start the last transaction.

array[]	$trxIdleCallbacks = []
	List of (callable, method name, atomic section id)

array[]	$trxPreCommitCallbacks = []
	List of (callable, method name, atomic section id)

callable[]	$trxRecurringCallbacks = []
	Map of (name => callable)

float	$trxReplicaLag = null
	Replication lag estimate at the time of BEGIN for the last transaction.

array[]	$trxSectionCancelCallbacks = []
	List of (callable, method name, atomic section id)

string	$trxShortId = ''
	ID of the active transaction or the empty string otherwise.

int	$trxStatus = self::STATUS_TRX_NONE
	Transaction status.

Exception null	$trxStatusCause
	The last error that caused the status to become STATUS_TRX_ERROR.

array null	$trxStatusIgnoredCause
	Error details of the last statement-only rollback.

float null	$trxTimestamp = null
	UNIX timestamp at the time of BEGIN for the last transaction.

float	$trxWriteAdjDuration = 0.0
	Like trxWriteQueryCount but excludes lock-bound, easy to replicate, queries.

int	$trxWriteAdjQueryCount = 0
	Number of write queries counted in trxWriteAdjDuration.

int	$trxWriteAffectedRows = 0
	Number of rows affected by write queries for the current transaction.

string[]	$trxWriteCallers = []
	Write query callers of the current transaction.

float	$trxWriteDuration = 0.0
	Seconds spent in write queries for the current transaction.

int	$trxWriteQueryCount = 0
	Number of write queries for the current transaction.

Static Private Attributes
static int	$DEADLOCK_DELAY_MAX = 1500000
	Maximum time to wait before retry.

static int	$DEADLOCK_DELAY_MIN = 500000
	Minimum time to wait before retry, in microseconds.

static int	$DEADLOCK_TRIES = 4
	Number of times to re-try an operation in case of deadlock.

static string	$NOT_APPLICABLE = 'n/a'
	Idiom used when a cancelable atomic section started the transaction.

static string	$PING_QUERY = 'SELECT 1 AS ping'
	Dummy SQL query.

static int	$PING_TTL = 1.0
	How long before it is worth doing a dummy query to test the connection.

static string	$SAVEPOINT_PREFIX = 'wikimedia_rdbms_atomic'
	Prefix to the atomic section counter used to make savepoint IDs.

static float	$SLOW_WRITE_SEC = 0.500
	Consider a write slow if it took more than this many seconds.

static float	$SMALL_WRITE_ROWS = 100
	Assume an insert of this many rows or less should be fast to replicate.

static int	$TEMP_NORMAL = 1
	Writes to this temporary table do not affect lastDoneWrites()

static int	$TEMP_PSEUDO_PERMANENT = 2
	Writes to this temporary table effect lastDoneWrites()

static float	$TINY_WRITE_SEC = 0.010
	Guess of how many seconds it takes to replicate a small insert.

Detailed Description

Relational database abstraction object.

Stable to extend

Since: 1.28

Definition at line 50 of file Database.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\Database::__construct ( array $params )

Note: exceptions for missing libraries/drivers should be thrown in initConnection() Stable to call

Parameters

array $params Parameters passed from Database::factory()

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 258 of file Database.php.

◆ __destruct()

Wikimedia\Rdbms\Database::__destruct ( )

Run a few simple sanity checks and close dangling connections.

Definition at line 5546 of file Database.php.

References Wikimedia\Rdbms\Database\closeConnection(), Wikimedia\Rdbms\Database\pendingWriteAndCallbackCallers(), and Wikimedia\Rdbms\Database\trxLevel().

Member Function Documentation

◆ __clone()

Wikimedia\Rdbms\Database::__clone ( )

Make sure that copies do not share the same client binding handle.

Exceptions

DBConnectionError

Definition at line 5509 of file Database.php.

References Wikimedia\Rdbms\Database\handleSessionLossPreconnect(), Wikimedia\Rdbms\Database\isOpen(), and Wikimedia\Rdbms\Database\open().

◆ __sleep()

Wikimedia\Rdbms\Database::__sleep ( )

Called by serialize.

Throw an exception when DB connection is serialized. This causes problems on some database engines because the connection is not restored on unserialize.

Definition at line 5538 of file Database.php.

◆ __toString()

Wikimedia\Rdbms\Database::__toString ( )

Get a debugging string that mentions the database type, the ID of this instance, and the ID of any underlying connection resource or driver object if one is present.

Returns: string "<db type> object #<X>" or "<db type> object #<X> (resource/handle id #<Y>)"

Since: 1.34

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5484 of file Database.php.

References Wikimedia\Rdbms\IDatabase\getType().

◆ addIdentifierQuotes()

Wikimedia\Rdbms\Database::addIdentifierQuotes ( $s )

Escape a SQL identifier (e.g.table, column, database) for use in a SQL queryDepending on the database this will either be backticks or "double quotes"

Parameters

string $s

Returns: string

Since: 1.33

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3143 of file Database.php.

References $s.

◆ addQuotes()

Wikimedia\Rdbms\Database::addQuotes ( $s )

Escape and quote a raw value string for use in a SQL query.

Parameters

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3124 of file Database.php.

References $s, and Wikimedia\Rdbms\Database\strencode().

◆ affectedRows()

Wikimedia\Rdbms\Database::affectedRows ( )

Get the number of rows affected by the last write query.

Similar to https://www.php.net/mysql_affected_rows but includes rows matched but not changed (ie. an UPDATE which sets all fields to the same value they already have). To get the old mysql_affected_rows behavior, include non-equality of the fields in WHERE.

Returns: int

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4775 of file Database.php.

References Wikimedia\Rdbms\Database\$affectedRowCount, and Wikimedia\Rdbms\Database\fetchAffectedRowCount().

Referenced by Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doReplace(), Wikimedia\Rdbms\Database\doUpsert(), Wikimedia\Rdbms\Database\executeQueryAttempt(), and Wikimedia\Rdbms\Database\updateTrxWriteQueryTime().

◆ aggregateValue()

Wikimedia\Rdbms\Database::aggregateValue	(	$valuedata,
		$valuename = `'value'`
	)

Return aggregated value alias.

Parameters

array	$valuedata
string	$valuename

Returns: array|string

Deprecated:: Since 1.33

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 2575 of file Database.php.

◆ anyChar()

Wikimedia\Rdbms\Database::anyChar ( )

Returns a token for buildLike() that denotes a '_' to be used in a LIKE query.

Returns: LikeMatch

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3204 of file Database.php.

◆ anyString()

Wikimedia\Rdbms\Database::anyString ( )

Returns a token for buildLike() that denotes a '' to be used in a LIKE query.

Returns: LikeMatch

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3208 of file Database.php.

◆ assertBuildSubstringParams()

Wikimedia\Rdbms\Database::assertBuildSubstringParams	(	$startPosition,
		$length
	)

protected

Check type and bounds for parameters to self::buildSubstring()

All supported databases have substring functions that behave the same for positive $startPosition and non-negative $length, but behaviors differ when given 0 or negative $startPosition or negative $length. The simplest solution to that is to just forbid those values.

Parameters

int	$startPosition
int \| null	$length

Since: 1.31

Definition at line 2707 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\buildSubstring(), and Wikimedia\Rdbms\DatabaseSqlite\buildSubstring().

◆ assertConditionIsNotEmpty()

Wikimedia\Rdbms\Database::assertConditionIsNotEmpty	(		$conds,
		string	$fname,
		bool	$deprecate
	)

protected

Check type and bounds conditions parameters for update.

In order to prevent possible performance or replication issues, empty condition for 'update' queries isn't allowed

Parameters

array \| string	$conds	conditions to be validated on emptiness
string	$fname	caller's function name to be passed to exception
bool	$deprecate	define the assertion type. If true then wfDeprecated will be called, otherwise DBUnexpectedError will be raised.

Since: 1.35

Definition at line 2733 of file Database.php.

References wfDeprecated().

Referenced by Wikimedia\Rdbms\Database\delete(), and Wikimedia\Rdbms\Database\update().

◆ assertHasConnectionHandle()

Wikimedia\Rdbms\Database::assertHasConnectionHandle ( )

finalprotected

Make sure there is an open connection handle (alive or not) as a sanity check.

This guards against fatal errors to the binding handle not being defined in cases where open() was never called or close() was already called

Exceptions

DBUnexpectedError

Definition at line 990 of file Database.php.

References Wikimedia\Rdbms\Database\isOpen().

Referenced by Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\executeQuery(), Wikimedia\Rdbms\Database\rollback(), and Wikimedia\Rdbms\DatabaseSqlite\serverIsReadOnly().

◆ assertIsWritableMaster()

Wikimedia\Rdbms\Database::assertIsWritableMaster ( )

protected

Make sure that this server is not marked as a replica nor read-only as a sanity check.

Exceptions

DBReadOnlyError

Definition at line 1001 of file Database.php.

References $source, and Wikimedia\Rdbms\Database\getReadOnlyReason().

Referenced by Wikimedia\Rdbms\Database\executeQuery().

◆ assertNoOpenTransactions()

Wikimedia\Rdbms\Database::assertNoOpenTransactions ( )

Assert that all explicit transactions or atomic sections have been closed.

Exceptions

DBTransactionError

Since: 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1531 of file Database.php.

References Wikimedia\Rdbms\Database\explicitTrxActive(), and Wikimedia\Rdbms\Database\flatAtomicSectionList().

◆ assertQueryIsCurrentlyAllowed()

Wikimedia\Rdbms\Database::assertQueryIsCurrentlyAllowed	(	$sql,
		$fname
	)

private

Error out if the DB is not in a valid state for a query via query()

Parameters

string	$sql
string	$fname

Exceptions

DBTransactionStateError

Definition at line 1504 of file Database.php.

References Wikimedia\Rdbms\Database\$trxStatusIgnoredCause, Wikimedia\Rdbms\Database\getQueryVerb(), and Wikimedia\Rdbms\Database\trxStatus().

Referenced by Wikimedia\Rdbms\Database\query().

◆ attributesFromType()

static Wikimedia\Rdbms\Database::attributesFromType	(	$dbType,
		$driver = `null`
	)

staticfinal

Parameters

string	$dbType	A possible DB type (sqlite, mysql, postgres,...)
string \| null	$driver	Optional name of a specific DB client driver

Returns: array Map of (Database::ATTR_* constant => value) for all such constants

Exceptions

InvalidArgumentException

Since: 1.31

Definition at line 460 of file Database.php.

References Wikimedia\Rdbms\Database\getClass().

Referenced by Wikimedia\Rdbms\LoadBalancer\getServerAttributes().

◆ begin()

Wikimedia\Rdbms\Database::begin	(	$fname = `__METHOD__`,
		$mode = `self::TRANSACTION_EXPLICIT`
	)

final

Begin a transaction.

Only call this from code with outer transcation scope. See https://www.mediawiki.org/wiki/Database_transactions for details. Nesting of transactions is not supported.

Note that when the DBO_TRX flag is set (which is usually the case for web requests, but not for maintenance scripts), any previous database query will have started a transaction automatically.

Nesting of transactions is not supported. Attempts to nest transactions will cause a warning, unless the current transaction was started automatically because of the DBO_TRX flag.

Parameters

string	$fname	Calling function name
string	$mode	A situationally valid IDatabase::TRANSACTION_* constant [optional]

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4484 of file Database.php.

References Wikimedia\Rdbms\Database\assertHasConnectionHandle(), Wikimedia\Rdbms\Database\doBegin(), Wikimedia\Rdbms\Database\flatAtomicSectionList(), Wikimedia\Rdbms\Database\getApproximateLagStatus(), Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\trxLevel(), Wikimedia\Rdbms\Database\trxStatus(), and Wikimedia\Rdbms\Database\trxTimestamp().

Referenced by Wikimedia\Rdbms\Database\beginIfImplied(), Wikimedia\Rdbms\Database\deadlockLoop(), Wikimedia\Rdbms\Database\onTransactionCommitOrIdle(), Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle(), and Wikimedia\Rdbms\Database\startAtomic().

◆ beginIfImplied()

Wikimedia\Rdbms\Database::beginIfImplied	(	$sql,
		$fname
	)

private

Start an implicit transaction if DBO_TRX is enabled and no transaction is active.

Parameters

string	$sql
string	$fname

Definition at line 1452 of file Database.php.

References Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\isTransactableQuery(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt().

◆ bitAnd()

Wikimedia\Rdbms\Database::bitAnd	(	$fieldLeft,
		$fieldRight
	)

Parameters

string \| int	$fieldLeft
string \| int	$fieldRight

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2591 of file Database.php.

◆ bitNot()

Wikimedia\Rdbms\Database::bitNot ( $field )

Parameters

string | int $field

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2583 of file Database.php.

◆ bitOr()

Wikimedia\Rdbms\Database::bitOr	(	$fieldLeft,
		$fieldRight
	)

Parameters

string \| int	$fieldLeft
string \| int	$fieldRight

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2599 of file Database.php.

◆ buildConcat()

Wikimedia\Rdbms\Database::buildConcat ( $stringList )

Build a concatenation list to feed into a SQL query.

Parameters

string[] $stringList Raw SQL expression list; caller is responsible for escaping

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2607 of file Database.php.

◆ buildGreatest()

Wikimedia\Rdbms\Database::buildGreatest	(	$fields,
		$values
	)

Build a GREATEST function statement comparing columns/values.Integer and float values in $values will not be quotedIf $fields is an array, then each value with a string key is treated as an expression (which must be manually quoted); such string keys do not appear in the SQL and are only descriptive aliases.

Parameters

string \| string[]	$fields	Name(s) of column(s) with values to compare
string \| int \| float \| string[] \| int[] \| float[]	$values	Values to compare

Returns: mixed

Since: 1.35

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2627 of file Database.php.

References Wikimedia\Rdbms\Database\buildSuperlative().

◆ buildGroupConcatField()

Wikimedia\Rdbms\Database::buildGroupConcatField	(	$delim,
		$table,
		$field,
		$conds = `''`,
		$join_conds = `[]`
	)

Build a GROUP_CONCAT or equivalent statement for a query.This is useful for combining a field for several rows into a single string. NULL values will not appear in the output, duplicated values will appear, and the resulting delimiter-separated values have no defined sort order. Code using the results may need to use the PHP unique() or sort() methods.

Parameters

string	$delim	Glue to bind the results together
string \| array	$table	Table name
string	$field	Field name
string \| array	$conds	Conditions
string \| array	$join_conds	Join conditions

Returns: string SQL text

Since: 1.23

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2615 of file Database.php.

References Wikimedia\Rdbms\Database\addQuotes(), and Wikimedia\Rdbms\Database\selectSQLText().

◆ buildIntegerCast()

Wikimedia\Rdbms\Database::buildIntegerCast ( $field )

Parameters

string $field Field or column to cast

Returns: string

Since: 1.31

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 2758 of file Database.php.

◆ buildLeast()

Wikimedia\Rdbms\Database::buildLeast	(	$fields,
		$values
	)

Build a LEAST function statement comparing columns/values.Integer and float values in $values will not be quotedIf $fields is an array, then each value with a string key is treated as an expression (which must be manually quoted); such string keys do not appear in the SQL and are only descriptive aliases.

Parameters

string \| string[]	$fields	Name(s) of column(s) with values to compare
string \| int \| float \| string[] \| int[] \| float[]	$values	Values to compare

Returns: mixed

Since: 1.35

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2635 of file Database.php.

References Wikimedia\Rdbms\Database\buildSuperlative().

◆ buildLike()

Wikimedia\Rdbms\Database::buildLike	(	$param,
		$params
	)

LIKE statement wrapper.This takes a variable-length argument list with parts of pattern to match containing either string literals that will be escaped or tokens returned by anyChar() or anyString(). Alternatively, the function could be provided with an array of aforementioned parameters.Example: $dbr->buildLike( 'My_page_title/', $dbr->anyString() ) returns a LIKE clause that searches for subpages of 'My page title'. Alternatively: $pattern = [ 'My_page_title/', $dbr->anyString() ]; $query .= $dbr->buildLike( $pattern );

Since: 1.16

Parameters

array[] \| string \| LikeMatch	$param
	string\|LikeMatch	...$params

Returns: string Fully built LIKE statement

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3177 of file Database.php.

References $s, Wikimedia\Rdbms\Database\addQuotes(), and Wikimedia\Rdbms\Database\escapeLikeInternal().

◆ buildSelectSubquery()

Wikimedia\Rdbms\Database::buildSelectSubquery	(	$table,
		$vars,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Equivalent to IDatabase::selectSQLText() except wraps the result in Subquery.

See also: IDatabase::selectSQLText()

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
string \| array	$join_conds	Join conditions

Returns: Subquery

Since: 1.31

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2762 of file Database.php.

References Wikimedia\Rdbms\Database\selectSQLText().

Referenced by Wikimedia\Rdbms\Database\selectRowCount().

◆ buildStringCast()

Wikimedia\Rdbms\Database::buildStringCast ( $field )

Parameters

string $field Field or column to cast

Returns: string

Since: 1.28

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2748 of file Database.php.

◆ buildSubstring()

Wikimedia\Rdbms\Database::buildSubstring	(	$input,
		$startPosition,
		$length = `null`
	)

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2686 of file Database.php.

References Wikimedia\Rdbms\Database\assertBuildSubstringParams().

◆ buildSuperlative()

Wikimedia\Rdbms\Database::buildSuperlative	(	$sqlfunc,
		$fields,
		$values
	)

protected

Build a superlative function statement comparing columns/values.

Integer and float values in $values will not be quoted

If $fields is an array, then each value with a string key is treated as an expression (which must be manually quoted); such string keys do not appear in the SQL and are only descriptive aliases.

Stable to override

Parameters

string	$sqlfunc	Name of a SQL function
string \| string[]	$fields	Name(s) of column(s) with values to compare
string \| int \| float \| string[] \| int[] \| float[]	$values	Values to compare

Returns: mixed

Since: 1.35

Definition at line 2655 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\addQuotes().

Referenced by Wikimedia\Rdbms\Database\buildGreatest(), Wikimedia\Rdbms\DatabaseSqlite\buildGreatest(), Wikimedia\Rdbms\Database\buildLeast(), and Wikimedia\Rdbms\DatabaseSqlite\buildLeast().

◆ cancelAtomic()

Wikimedia\Rdbms\Database::cancelAtomic	(		$fname = `__METHOD__`,
		AtomicSectionIdentifier	$sectionId = `null`
	)

final

Cancel an atomic section of SQL statements.

This will roll back only the statements executed since the start of the most recent atomic section, and close that section. If a transaction was open before the corresponding startAtomic() call, any statements before that call are not rolled back and the transaction remains open. If the corresponding startAtomic() implicitly started a transaction, that transaction is rolled back.

Note: callers must use additional measures for situations involving two or more (peer) transactions (e.g. updating two database servers at once). The transaction and savepoint logic of startAtomic() are bound to specific IDatabase instances.

Note that a call to IDatabase::rollback() will also roll back any open atomic sections.

Note: As a micro-optimization to save a few DB calls, this method may only be called when startAtomic() was called with the ATOMIC_CANCELABLE flag.

Since: 1.31

See also: IDatabase::startAtomic

Parameters

string	$fname
AtomicSectionIdentifier \| null	$sectionId	Section ID from startAtomic(); passing this enables cancellation of unclosed nested sections [optional]

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4383 of file Database.php.

References Wikimedia\Rdbms\Database\currentAtomicSectionId(), Wikimedia\Rdbms\Database\doRollbackToSavepoint(), Wikimedia\Rdbms\Database\modifyCallbacksForCancel(), Wikimedia\Rdbms\Database\rollback(), Wikimedia\Rdbms\Database\runOnAtomicSectionCancelCallbacks(), Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\trxStatus().

Referenced by Wikimedia\Rdbms\Database\doAtomicSection(), Wikimedia\Rdbms\DatabasePostgres\doInsertNonConflicting(), Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doReplace(), Wikimedia\Rdbms\Database\doUpsert(), and Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle().

◆ canRecoverFromDisconnect()

Wikimedia\Rdbms\Database::canRecoverFromDisconnect	(	$sql,
		$priorWritesPending
	)

private

Determine whether it is safe to retry queries after a database connection is lost.

Parameters

string	$sql	SQL query
bool	$priorWritesPending	Whether there is a transaction open with possible write queries or transaction pre-commit/idle callbacks waiting on it to finish.

Returns: bool True if it is safe to retry the query, false otherwise

Definition at line 1550 of file Database.php.

References Wikimedia\Rdbms\Database\explicitTrxActive().

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt().

◆ clearFlag()

Wikimedia\Rdbms\Database::clearFlag	(	$flag,
		$remember = `self::REMEMBER_NOTHING`
	)

Clear a flag for this connection.

Parameters

int	$flag	One of (IDatabase::DBO_DEBUG, IDatabase::DBO_TRX)
string	$remember	IDatabase::REMEMBER_* constant [default: REMEMBER_NOTHING]

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 791 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks().

◆ close()

Wikimedia\Rdbms\Database::close	(	$fname = `__METHOD__`,
		$owner = `null`
	)

final

Close the database connection.

This should only be called after any transactions have been resolved, aside from read-only automatic transactions (assuming no callbacks are registered). If a transaction is still open anyway, it will be rolled back.

Parameters

string	$fname	Caller name
int \| null	$owner	ID of the calling instance (e.g. the LBFactory ID)

Returns: bool Success

Exceptions

DBError

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 912 of file Database.php.

References Wikimedia\Rdbms\Database\closeConnection(), Wikimedia\Rdbms\Database\flatAtomicSectionList(), Wikimedia\Rdbms\Database\pendingWriteAndCallbackCallers(), Wikimedia\Rdbms\Database\rollback(), Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\writesOrCallbacksPending().

Referenced by Wikimedia\Rdbms\DatabaseSqlite\open(), Wikimedia\Rdbms\DatabaseMysqlBase\open(), and Wikimedia\Rdbms\DatabasePostgres\open().

◆ closeConnection()

Wikimedia\Rdbms\Database::closeConnection ( )

abstractprotected

Closes underlying database connection.

Returns: bool Whether connection was closed successfully

Since: 1.20

Reimplemented in Wikimedia\Rdbms\DatabaseMysqli, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\__destruct(), Wikimedia\Rdbms\Database\close(), and Wikimedia\Rdbms\Database\replaceLostConnection().

◆ commit()

Wikimedia\Rdbms\Database::commit	(	$fname = `__METHOD__`,
		$flush = `self::FLUSHING_ONE`
	)

final

Commits a transaction previously started using begin()

If no transaction is in progress, a warning is issued.

Only call this from code with outer transcation scope. See https://www.mediawiki.org/wiki/Database_transactions for details. Nesting of transactions is not supported.

Parameters

string	$fname
string	$flush	Flush flag, set to situationally valid IDatabase::FLUSHING_* constant to disable warnings about explicitly committing implicit transactions, or calling commit when no transaction is in progress. This will trigger an exception if there is an ongoing explicit transaction. Only set the flush flag if you are sure that these warnings are not applicable, and no explicit transactions are open.

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4548 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\deadlockLoop(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\flushSnapshot(), and Wikimedia\Rdbms\Database\getScopedLockAndFlush().

◆ conditional()

Wikimedia\Rdbms\Database::conditional	(	$cond,
		$trueVal,
		$falseVal
	)

Returns an SQL expression for a simple conditional.This doesn't need to be overridden unless CASE isn't supported in the RDBMS.

Parameters

string \| array	$cond	SQL expression which will result in a boolean value
string	$trueVal	SQL expression to return if true
string	$falseVal	SQL expression to return if false

Returns: string SQL fragment

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3744 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\onAtomicSectionCancel(), Wikimedia\Rdbms\Database\onTransactionCommitOrIdle(), Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle(), and Wikimedia\Rdbms\Database\onTransactionResolution().

◆ connectionErrorLogger()

Wikimedia\Rdbms\Database::connectionErrorLogger	(	$errno,
		$errstr
	)

Error handler for logging errors during database connection This method should not be used outside of Database classes.

Parameters

int	$errno
string	$errstr

Definition at line 891 of file Database.php.

◆ consumeTrxShortId()

Wikimedia\Rdbms\Database::consumeTrxShortId ( )

private

Reset the transaction ID and return the old one.

Returns: string The old transaction ID or the empty string if there wasn't one

Definition at line 1635 of file Database.php.

References Wikimedia\Rdbms\Database\$trxShortId.

Referenced by Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\handleSessionLossPreconnect(), and Wikimedia\Rdbms\Database\rollback().

◆ currentAtomicSectionId()

Wikimedia\Rdbms\Database::currentAtomicSectionId ( )

private

Returns: AtomicSectionIdentifier|null ID of the topmost atomic section level

Definition at line 3960 of file Database.php.

References Wikimedia\Rdbms\Database\trxLevel().

◆ databasesAreIndependent()

Wikimedia\Rdbms\Database::databasesAreIndependent ( )

Returns true if DBs are assumed to be on potentially different servers.In systems like mysql/mariadb, different databases can easily be referenced on a single connection merely by name, even in a single query via JOIN. On the other hand, Postgres treats databases as logically separate, with different database users, requiring special mechanisms like postgres_fdw to "mount" foreign DBs. This is true even among DBs on the same server. Changing the selected database via selectDomain() requires a new connection.

Returns: bool

Since: 1.29

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2775 of file Database.php.

◆ dbSchema()

Wikimedia\Rdbms\Database::dbSchema ( $schema = null )

Get/set the db schema.

Parameters

string | null $schema The database schema to set, or omitted to leave it unchanged

Returns: string The previous db schema

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 587 of file Database.php.

References Wikimedia\Rdbms\Database\getDBname().

Referenced by Wikimedia\Rdbms\Database\relationSchemaQualifier().

◆ deadlockLoop()

Wikimedia\Rdbms\Database::deadlockLoop ( $args )

Perform a deadlock-prone transaction.This function invokes a callback function to perform a set of write queries. If a deadlock occurs during the processing, the transaction will be rolled back and the callback function will be called again.Avoid using this method outside of Job or Maintenance classes.Usage: $dbw->deadlockLoop( callback, ... );Extra arguments are passed through to the specified callback function. This method requires that no transactions are already active to avoid causing premature commits or exceptions.Returns whatever the callback function returned on its successful, iteration, or false on error, for example if the retry limit was reached.

Parameters

mixed ...$args

Returns: mixed

Exceptions

DBUnexpectedError
Exception

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3834 of file Database.php.

References $args, Wikimedia\Rdbms\Database\$DEADLOCK_TRIES, Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\rollback(), and Wikimedia\Rdbms\Database\wasDeadlock().

◆ decodeBlob()

Wikimedia\Rdbms\Database::decodeBlob ( $b )

Some DBMSs return a special placeholder object representing blob fields in result objects.Pass the object through this function to return the original string.

Parameters

string | Blob $b

Returns: string

Exceptions

References Wikimedia\Rdbms\Database\$affectedRowCount, $res, Wikimedia\Rdbms\Database\affectedRows(), Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\fieldNameWithAlias(), Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\select(), and Wikimedia\Rdbms\Database\startAtomic().

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 4987 of file Database.php.

◆ decodeExpiry()

Wikimedia\Rdbms\Database::decodeExpiry	(	$expiry,
		$format = `TS_MW`
	)

Decode an expiry time into a DBMS independent format.

Parameters

string	$expiry	DB timestamp field value for expiry
int	$format	TS_* constant, defaults to TS_MW

Returns: string

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5397 of file Database.php.

References Wikimedia\Rdbms\Database\getInfinity().

◆ delete()

Wikimedia\Rdbms\Database::delete	(	$table,
		$conds,
		$fname = `__METHOD__`
	)

Delete all rows in a table that match a condition.

Parameters

string	$table	Table name
string \| array	$conds	Array of conditions. See $conds in IDatabase::select() In order to prevent possible performance or replication issues or damaging a data accidentally, an empty condition for 'delete' queries isn't allowed. IDatabase::ALL_ROWS should be passed explicitely in order to delete all rows.
string	$fname	Name of the calling function

Returns: bool Return true if no exception was thrown (deprecated since 1.33)

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3452 of file Database.php.

References Wikimedia\Rdbms\Database\assertConditionIsNotEmpty(), Wikimedia\Rdbms\Database\makeList(), Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

◆ deleteJoin()

Wikimedia\Rdbms\Database::deleteJoin	(	$delTable,
		$joinTable,
		$delVar,
		$joinVar,
		$conds,
		$fname = `__METHOD__`
	)

DELETE where the condition is a join.MySQL overrides this to use a multi-table DELETE syntax, in other databases we use sub-selectsFor safety, an empty $conds will not delete everything. If you want to delete all rows where the join condition matches, set $conds=IDatabase::ALL_ROWS.DO NOT put the join condition in $conds.

Parameters

string	$delTable	The table to delete from.
string	$joinTable	The other table.
string	$delVar	The variable to join on, in the first table.
string	$joinVar	The variable to join on, in the second table.
array \| string	$conds	Condition array of field names mapped to variables, ANDed together in the WHERE clause
string	$fname	Calling function name (use METHOD) for logs/profiling

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3413 of file Database.php.

References Wikimedia\Rdbms\Database\makeList(), Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

◆ doAtomicSection()

Wikimedia\Rdbms\Database::doAtomicSection	(		$fname,
		callable	$callback,
			$cancelable = `self::ATOMIC_NOT_CANCELABLE`
	)

final

Perform an atomic section of reversable SQL statements from a callback.

The $callback takes the following arguments:

This database object
The value of $fname

This will execute the callback inside a pair of startAtomic()/endAtomic() calls. If any exception occurs during execution of the callback, it will be handled as follows:

If $cancelable is ATOMIC_CANCELABLE, cancelAtomic() will be called to back out any (and only) statements executed during the atomic section. If that succeeds, then the exception will be re-thrown; if it fails, then a different exception will be thrown and any further query attempts will fail until rollback() is called.
If $cancelable is ATOMIC_NOT_CANCELABLE, cancelAtomic() will be called to mark the end of the section and the error will be re-thrown. Any further query attempts will fail until rollback() is called.

This method is convenient for letting calls to the caller of this method be wrapped in a try/catch blocks for exception types that imply that the caller failed but was able to properly discard the changes it made in the transaction. This method can be an alternative to explicit calls to startAtomic()/endAtomic()/cancelAtomic().

Example usage, "RecordStore::save" method:

$dbw->doAtomicSection( __METHOD__, function ( $dbw ) use ( $record ) {
    // Create new record metadata row
    $dbw->insert( 'records', $record->toArray(), __METHOD__ );
    // Figure out where to store the data based on the new row's ID
    $path = $this->recordDirectory . '/' . $dbw->insertId();
    // Write the record data to the storage system;
    // blob store throughs StoreFailureException on failure
    $this->blobStore->create( $path, $record->getJSON() );
    // Try to cleanup files orphaned by transaction rollback
    $dbw->onTransactionResolution(
        function ( $type ) use ( $path ) {
            if ( $type === IDatabase::TRIGGER_ROLLBACK ) {
                $this->blobStore->delete( $path );
            }
        },
        __METHOD__
     );
}, $dbw::ATOMIC_CANCELABLE );

Example usage, caller of the "RecordStore::save" method:

$dbw->startAtomic( __METHOD__ );
// ...various SQL writes happen...
try {
    $recordStore->save( $record );
} catch ( StoreFailureException $e ) {
    // ...various SQL writes happen...
}
// ...various SQL writes happen...
$dbw->endAtomic( __METHOD__ );

See also: Database::startAtomic; Database::endAtomic; Database::cancelAtomic

Parameters

string	$fname	Caller name (usually METHOD)
callable	$callback	Callback that issues DB updates
string	$cancelable	Pass self::ATOMIC_CANCELABLE to use a savepoint and enable self::cancelAtomic() for this section.

Returns: mixed $res Result of the callback (since 1.28)

Exceptions

DBError	If an error occurs, see IDatabase::query()
Exception	If an error occurs in the callback

Since: 1.27; prior to 1.31 this did a rollback() instead of cancelAtomic(), and assumed no callers up the stack would ever try to catch the exception.

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4468 of file Database.php.

References $res, Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\endAtomic(), and Wikimedia\Rdbms\Database\startAtomic().

◆ doBegin()

Wikimedia\Rdbms\Database::doBegin ( $fname )

protected

Issues the BEGIN command to the database server.

See also: Database::begin() Stable to override

Parameters

string $fname

Exceptions

DBError

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 4544 of file Database.php.

References Wikimedia\Rdbms\Database\query().

Referenced by Wikimedia\Rdbms\Database\begin().

◆ doCommit()

Wikimedia\Rdbms\Database::doCommit ( $fname )

protected

Issues the COMMIT command to the database server.

Stable to override

See also: Database::commit()

Parameters

string $fname

Exceptions

DBError

Definition at line 4618 of file Database.php.

References Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\commit().

◆ doDropTable()

Wikimedia\Rdbms\Database::doDropTable	(	$table,
		$fname
	)

protected

See also: Database::dropTable() Stable to override

Parameters

string	$table
string	$fname

Definition at line 5345 of file Database.php.

References Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\dropTable().

◆ doGetLag()

Wikimedia\Rdbms\Database::doGetLag ( )

protected

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 4963 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\getLag().

◆ doHandleSessionLossPreconnect()

Wikimedia\Rdbms\Database::doHandleSessionLossPreconnect ( )

protected

Reset any additional subclass trx* and session* fields Stable to override.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 1607 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\handleSessionLossPreconnect().

◆ doInitConnection()

Wikimedia\Rdbms\Database::doInitConnection ( )

protected

Actually connect to the database over the wire (or to local files)

Exceptions

DBConnectionError

Since: 1.31

Definition at line 328 of file Database.php.

References Wikimedia\Rdbms\Database\open().

Referenced by Wikimedia\Rdbms\Database\initConnection().

◆ doInsert()

Wikimedia\Rdbms\Database::doInsert	(		$table,
		array	$rows,
			$fname
	)

protected

See also: Database::insert() Stable to override

Parameters

string	$table
array	$rows	Non-empty list of rows
string	$fname

Since: 1.35

Definition at line 2351 of file Database.php.

References Wikimedia\Rdbms\Database\makeInsertLists(), Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\replace(), and Wikimedia\Rdbms\Database\upsert().

◆ doInsertNonConflicting()

Wikimedia\Rdbms\Database::doInsertNonConflicting	(		$table,
		array	$rows,
			$fname
	)

protected

See also: Database::insert() Stable to override

Parameters

string	$table
array	$rows	Non-empty list of rows
string	$fname

Since: 1.35

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 2368 of file Database.php.

References Wikimedia\Rdbms\Database\makeInsertLists(), Wikimedia\Rdbms\Database\makeInsertNonConflictingVerbAndOptions(), Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\insert().

◆ doInsertSelectGeneric()

Wikimedia\Rdbms\Database::doInsertSelectGeneric	(		$destTable,
			$srcTable,
		array	$varMap,
			$conds,
			$fname,
		array	$insertOptions,
		array	$selectOptions,
			$selectJoinConds
	)

protected

Implementation of insertSelect() based on select() and insert()

See also: IDatabase::insertSelect()

Parameters

string	$destTable
string \| array	$srcTable
array	$varMap
array	$conds
string	$fname
array	$insertOptions
array	$selectOptions
array	$selectJoinConds

Since: 1.35

Definition at line 3539 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabasePostgres\doInsertSelectNative(), and Wikimedia\Rdbms\Database\insertSelect().

◆ doInsertSelectNative()

Wikimedia\Rdbms\Database::doInsertSelectNative	(		$destTable,
			$srcTable,
		array	$varMap,
			$conds,
			$fname,
		array	$insertOptions,
		array	$selectOptions,
			$selectJoinConds
	)

protected

Native server-side implementation of insertSelect() for situations where we don't want to select everything into memory.

See also: IDatabase::insertSelect()

Parameters

string	$destTable
string \| array	$srcTable
array	$varMap
array	$conds
string	$fname
array	$insertOptions
array	$selectOptions
array	$selectJoinConds

Since: 1.35

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 3604 of file Database.php.

References Wikimedia\Rdbms\Database\isFlagInOptions(), Wikimedia\Rdbms\Database\makeInsertNonConflictingVerbAndOptions(), Wikimedia\Rdbms\Database\query(), Wikimedia\Rdbms\Database\selectSQLText(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\insertSelect().

◆ doLockTables()

Wikimedia\Rdbms\Database::doLockTables	(	array	$read,
		array	$write,
			$method
	)

protected

Helper function for lockTables() that handles the actual table locking.

Stable to override

Parameters

array	$read	Array of tables to lock for read access
array	$write	Array of tables to lock for write access
string	$method	Name of caller

Returns: true

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabasePostgres.

Definition at line 5304 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\lockTables().

◆ doQuery()

Wikimedia\Rdbms\Database::doQuery ( $sql )

abstractprotected

Run a query and return a DBMS-dependent wrapper or boolean.

This is meant to handle the basic command of actually sending a query to the server via the driver. No implicit transaction, reconnection, nor retry logic should happen here. The higher level query() method is designed to handle those sorts of concerns. This method should not trigger such higher level methods.

The lastError() and lastErrno() methods should meaningfully reflect what error, if any, occurred during the last call to this method. Methods like executeQuery(), query(), select(), insert(), update(), delete(), and upsert() implement their calls to doQuery() such that an immediately subsequent call to lastError()/lastErrno() meaningfully reflects any error that occurred during that public query method call.

For SELECT queries, this returns either:

a) A driver-specific value/resource, only on success. This can be iterated over by calling fetchObject()/fetchRow() until there are no more rows. Alternatively, the result can be passed to resultObject() to obtain an IResultWrapper instance which can then be iterated over via "foreach".
b) False, on any query failure

For non-SELECT queries, this returns either:

a) A driver-specific value/resource, only on success
b) True, only on success (e.g. no meaningful result other than "OK")
c) False, on any query failure

Parameters

string $sql SQL query

Returns: mixed|bool An object, resource, or true on success; false on failure

Reimplemented in Wikimedia\Rdbms\DatabaseMysqli, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt().

◆ doReleaseSavepoint()

Wikimedia\Rdbms\Database::doReleaseSavepoint	(	$identifier,
		$fname
	)

protected

Release a savepoint.

This is used internally to implement atomic sections. It should not be used otherwise.

Stable to override

Since: 1.31

Parameters

string	$identifier	Identifier for the savepoint
string	$fname	Calling function name

Definition at line 4279 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\query().

Referenced by Wikimedia\Rdbms\Database\endAtomic().

◆ doReplace()

Wikimedia\Rdbms\Database::doReplace	(		$table,
		array	$uniqueKeys,
		array	$rows,
			$fname
	)

protected

See also: Database::replace() Stable to override

Parameters

string	$table
string[][]	$uniqueKeys	Non-empty list of unique keys
array	$rows	Non-empty list of rows
string	$fname

Since: 1.35

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3273 of file Database.php.

References Wikimedia\Rdbms\Database\$affectedRowCount, Wikimedia\Rdbms\Database\affectedRows(), Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\makeConditionCollidesUponKeys(), and Wikimedia\Rdbms\Database\startAtomic().

Referenced by Wikimedia\Rdbms\Database\replace().

◆ doRollback()

Wikimedia\Rdbms\Database::doRollback ( $fname )

protected

Issues the ROLLBACK command to the database server.

Stable to override

See also: Database::rollback()

Parameters

string $fname

Exceptions

DBError

Definition at line 4688 of file Database.php.

References Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\rollback().

◆ doRollbackToSavepoint()

Wikimedia\Rdbms\Database::doRollbackToSavepoint	(	$identifier,
		$fname
	)

protected

Rollback to a savepoint.

This is used internally to implement atomic sections. It should not be used otherwise.

Stable to override

Since: 1.31

Parameters

string	$identifier	Identifier for the savepoint
string	$fname	Calling function name

Definition at line 4295 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\query().

Referenced by Wikimedia\Rdbms\Database\cancelAtomic().

◆ doSavepoint()

Wikimedia\Rdbms\Database::doSavepoint	(	$identifier,
		$fname
	)

protected

Create a savepoint.

This is used internally to implement atomic sections. It should not be used otherwise.

Stable to override

Since: 1.31

Parameters

string	$identifier	Identifier for the savepoint
string	$fname	Calling function name

Definition at line 4263 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\query().

Referenced by Wikimedia\Rdbms\Database\startAtomic().

◆ doSelectDomain()

Wikimedia\Rdbms\Database::doSelectDomain ( DatabaseDomain $domain )

protected

Stable to override.

Parameters

DatabaseDomain $domain

Exceptions

DBConnectionError
DBError

Since: 1.32

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2800 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\selectDomain().

◆ doTruncate()

Wikimedia\Rdbms\Database::doTruncate	(	array	$tables,
			$fname
	)

protected

See also: Database::truncate() Stable to override

Parameters

string[]	$tables
string	$fname

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5376 of file Database.php.

References Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\truncate().

◆ doUnlockTables()

Wikimedia\Rdbms\Database::doUnlockTables ( $method )

protected

Helper function for unlockTables() that handles the actual table unlocking.

Stable to override

Parameters

string $method Name of caller

Returns: true

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 5325 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\unlockTables().

◆ doUpsert()

Wikimedia\Rdbms\Database::doUpsert	(		$table,
		array	$rows,
		array	$uniqueKeys,
		array	$set,
			$fname
	)

protected

See also: Database::upsert() Stable to override

Parameters

string	$table
array[]	$rows	Non-empty list of rows
string[][]	$uniqueKeys	Non-empty list of unique keys
array	$set
string	$fname

Since: 1.35

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3385 of file Database.php.

References Wikimedia\Rdbms\Database\$affectedRowCount, Wikimedia\Rdbms\Database\affectedRows(), Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\makeConditionCollidesUponKeys(), Wikimedia\Rdbms\Database\startAtomic(), and Wikimedia\Rdbms\Database\update().

Referenced by Wikimedia\Rdbms\Database\upsert().

◆ dropTable()

Wikimedia\Rdbms\Database::dropTable	(	$table,
		$fname = `__METHOD__`
	)

Delete a table.

Parameters

string	$table
string	$fname

Returns: bool Whether the table already existed

Exceptions

DBError If an error occurs

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5329 of file Database.php.

References Wikimedia\Rdbms\Database\doDropTable(), and Wikimedia\Rdbms\Database\tableExists().

◆ duplicateTableStructure()

Wikimedia\Rdbms\Database::duplicateTableStructure	(	$oldName,
		$newName,
		$temporary = `false`,
		$fname = `__METHOD__`
	)

Creates a new table with structure copied from existing table.Note that unlike most database abstraction functions, this function does not automatically append database prefix, because it works at a lower abstraction level. The table names passed to this function shall not be quoted (this function calls addIdentifierQuotes() when needed).

Parameters

string	$oldName	Name of table whose structure should be copied
string	$newName	Name of table to be created
bool	$temporary	Whether the new table should be temporary
string	$fname	Calling function name

Returns: bool True if operation was successful

Exceptions

RuntimeException

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 4735 of file Database.php.

◆ encodeBlob()

Wikimedia\Rdbms\Database::encodeBlob ( $b )

Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted.To insert into such a field, pass the data through this function before passing it to IDatabase::insert().

Parameters

string $b

Returns: string|Blob

Exceptions

References Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\currentAtomicSectionId(), Wikimedia\Rdbms\Database\doReleaseSavepoint(), Wikimedia\Rdbms\Database\reassignCallbacksForSection(), and Wikimedia\Rdbms\Database\trxLevel().

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 4979 of file Database.php.

◆ encodeExpiry()

Wikimedia\Rdbms\Database::encodeExpiry ( $expiry )

Encode an expiry time into the DBMS dependent format.

Parameters

string $expiry Timestamp for expiry, or the 'infinity' string

Returns: string

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5391 of file Database.php.

References Wikimedia\Rdbms\Database\getInfinity(), and Wikimedia\Rdbms\Database\timestamp().

◆ endAtomic()

Wikimedia\Rdbms\Database::endAtomic ( $fname = __METHOD__ )

final

Ends an atomic section of SQL statements.

Ends the next section of atomic SQL statements and commits the transaction if necessary.

Since: 1.23

See also: IDatabase::startAtomic

Parameters

string $fname

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4349 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\doAtomicSection(), Wikimedia\Rdbms\DatabasePostgres\doInsertNonConflicting(), Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doReplace(), Wikimedia\Rdbms\DatabaseSqlite\doTruncate(), Wikimedia\Rdbms\Database\doUpsert(), Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle(), and Wikimedia\Rdbms\Database\unlockTables().

◆ escapeLikeInternal()

Wikimedia\Rdbms\Database::escapeLikeInternal	(	$s,
		$escapeChar = '`'
	)

protected

Stable to override.

Parameters

string	$s
string	$escapeChar

Returns: string

Definition at line 3167 of file Database.php.

References $s.

Referenced by Wikimedia\Rdbms\Database\buildLike(), and Wikimedia\Rdbms\DatabaseMysqlBase\tableExists().

◆ estimateRowCount()

Wikimedia\Rdbms\Database::estimateRowCount	(	$tables,
		$var = `'*'`,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Estimate the number of rows in dataset.MySQL allows you to estimate the number of rows that would be returned by a SELECT query, using EXPLAIN SELECT. The estimate is provided using index cardinality statistics, and is notoriously inaccurate, especially when large numbers of rows have recently been added or deleted.For DBMSs that don't support fast result size estimation, this function will actually perform the SELECT COUNT(*).Takes the same arguments as IDatabase::select().

Parameters

string \| string[]	$tables	Table name(s)
string	$var	Column for which NULL values are not counted [default "*"]
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select
array \| string	$join_conds	Join conditions

Returns: int Row count

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabasePostgres.

Definition at line 2037 of file Database.php.

References $res, Wikimedia\Rdbms\Database\extractSingleFieldFromList(), Wikimedia\Rdbms\IDatabase\fetchRow(), Wikimedia\Rdbms\Database\normalizeConditions(), and Wikimedia\Rdbms\Database\select().

◆ executeQuery()

Wikimedia\Rdbms\Database::executeQuery	(	$sql,
		$fname,
		$flags
	)

finalprotected

Execute a query, retrying it if there is a recoverable connection loss.

This is similar to query() except:

It does not prevent all non-ROLLBACK queries if there is a corrupted transaction
It does not disallow raw queries that are supposed to use dedicated IDatabase methods
It does not throw exceptions for common error cases

This is meant for internal use with Database subclasses.

Parameters

string	$sql	Original SQL query
string	$fname	Name of the calling function
int	$flags	Bit field of class QUERY_* constants

Returns

array An n-tuple of:

mixed|bool: An object, resource, or true on success; false on failure
string: The result of calling lastError()
int: The result of calling lastErrno()
bool: Whether a rollback is needed to allow future non-rollback queries

Exceptions

DBUnexpectedError

Definition at line 1267 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\doSelectDomain(), and Wikimedia\Rdbms\Database\query().

◆ executeQueryAttempt()

Wikimedia\Rdbms\Database::executeQueryAttempt	(	$sql,
		$commentedSql,
		$isPermWrite,
		$fname,
		$flags
	)

private

Wrapper for doQuery() that handles DBO_TRX, profiling, logging, affected row count tracking, and reconnects (without retry) on query failure due to connection loss.

Parameters

string	$sql	Original SQL query
string	$commentedSql	SQL query with debugging/trace comment
bool	$isPermWrite	Whether the query is a (non-temporary table) write
string	$fname	Name of the calling function
int	$flags	Bit field of class QUERY_* constants

Returns

array An n-tuple of:

mixed|bool: An object, resource, or true on success; false on failure
string: The result of calling lastError()
int: The result of calling lastErrno()
- bool: Whether a statement rollback error occurred
bool: Whether a disconnect both happened and was recoverable
bool: Whether a reconnection attempt was both made and succeeded

Exceptions

DBUnexpectedError

Definition at line 1364 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\executeQuery().

◆ explicitTrxActive()

Wikimedia\Rdbms\Database::explicitTrxActive ( )

Returns: bool Whether an explicit transaction or atomic sections are still open

Since: 1.28

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4727 of file Database.php.

References Wikimedia\Rdbms\Database\$trxAutomatic, and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\assertNoOpenTransactions(), Wikimedia\Rdbms\Database\canRecoverFromDisconnect(), and Wikimedia\Rdbms\Database\flushSnapshot().

◆ extractSingleFieldFromList()

Wikimedia\Rdbms\Database::extractSingleFieldFromList ( $var )

finalprotected

Parameters

array | string $var Field parameter in the style of select()

Returns: string|null Column name or null; ignores aliases

Definition at line 2260 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\estimateRowCount(), Wikimedia\Rdbms\DatabasePostgres\estimateRowCount(), Wikimedia\Rdbms\Database\estimateRowCount(), and Wikimedia\Rdbms\Database\selectRowCount().

◆ factory()

static Wikimedia\Rdbms\Database::factory	(	$type,
		$params = `[]`,
		$connect = `self::NEW_CONNECTED`
	)

staticfinal

Construct a Database subclass instance given a database type and parameters.

This also connects to the database immediately upon object construction

Parameters

string	$type	A possible DB type (sqlite, mysql, postgres,...)
array	$params	Parameter map with keys: host : The hostname of the DB server user : The name of the database user the client operates under password : The password for the database user dbname : The name of the database to use where queries do not specify one. The database must exist or an error might be thrown. Setting this to the empty string will avoid any such errors and make the handle have no implicit database scope. This is useful for queries like SHOW STATUS, CREATE DATABASE, or DROP DATABASE. Note that a "database" in Postgres is rougly equivalent to an entire MySQL server. This the domain in which user names and such are defined, e.g. users are database-specific in Postgres. schema : The database schema to use (if supported). A "schema" in Postgres is roughly equivalent to a "database" in MySQL. Note that MySQL and SQLite do not use schemas. tablePrefix : Optional table prefix that is implicitly added on to all table names recognized in queries. This can be used in place of schemas for handle site farms. flags : Optional bit field of DBO_* constants that define connection, protocol, buffering, and transaction behavior. It is STRONGLY adviced to leave the DBO_DEFAULT flag in place UNLESS this this database simply acts as a key/value store. driver: Optional name of a specific DB client driver. For MySQL, there is only the 'mysqli' driver; the old one 'mysql' has been removed. variables: Optional map of session variables to set after connecting. This can be used to adjust lock timeouts or encoding modes and the like. topologyRole: Optional IDatabase::ROLE_* constant for the server. topologicalMaster: Optional name of the master server within the replication topology. lbInfo: Optional map of field/values for the managing load balancer instance. The "master" and "replica" fields are used to flag the replication role of this database server and whether methods like getLag() should actually issue queries. lazyMasterHandle: lazy-connecting IDatabase handle to the master DB for the cluster that this database belongs to. This is used for replication status purposes. connLogger: Optional PSR-3 logger interface instance. queryLogger: Optional PSR-3 logger interface instance. profiler : Optional callback that takes a section name argument and returns a ScopedCallback instance that ends the profile section in its destructor. These will be called in query(), using a simplified version of the SQL that also includes the agent as a SQL comment. trxProfiler: Optional TransactionProfiler instance. errorLogger: Optional callback that takes an Exception and logs it. deprecationLogger: Optional callback that takes a string and logs it. cliMode: Whether to consider the execution context that of a CLI script. agent: Optional name used to identify the end-user in query profiling/logging. srvCache: Optional BagOStuff instance to an APC-style cache. nonNativeInsertSelectBatchSize: Optional batch size for non-native INSERT SELECT. ownerId: Optional integer ID of a LoadBalancer instance that manages this instance.
int	$connect	One of the class constants (NEW_CONNECTED, NEW_UNCONNECTED) [optional]

Returns: Database|null If the database driver or extension cannot be found

Exceptions

InvalidArgumentException If the database driver or extension cannot be found

Since: 1.18

Definition at line 405 of file Database.php.

References Wikimedia\Rdbms\Database\$conn, $type, and Wikimedia\Rdbms\Database\getClass().

Referenced by Wikimedia\Rdbms\DatabaseSqlite\newStandaloneInstance(), and Wikimedia\Rdbms\LoadBalancer\reallyOpenConnection().

◆ fetchAffectedRowCount()

Wikimedia\Rdbms\Database::fetchAffectedRowCount ( )

abstractprotected

Returns: int Number of retrieved rows according to the driver

Reimplemented in Wikimedia\Rdbms\DatabaseMysqli, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\affectedRows().

◆ fieldExists()

Wikimedia\Rdbms\Database::fieldExists	(	$table,
		$field,
		$fname = `__METHOD__`
	)

Determines whether a field exists in a table.

Parameters

string	$table	Table name
string	$field	Filed to check on that table
string	$fname	Calling function name (optional)

Returns: bool Whether $table has filed $field

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2292 of file Database.php.

References Wikimedia\Rdbms\IMaintainableDatabase\fieldInfo().

◆ fieldHasBit()

Wikimedia\Rdbms\Database::fieldHasBit	(	$field,
		$flags
	)

finalprotected

Parameters

int	$field
int	$flags

Returns: bool

Since: 1.34

Definition at line 5457 of file Database.php.

References Wikimedia\Rdbms\Database\$flags.

Referenced by Wikimedia\Rdbms\Database\executeQuery(), Wikimedia\Rdbms\Database\isWriteQuery(), and Wikimedia\Rdbms\Database\query().

◆ fieldNamesWithAlias()

Wikimedia\Rdbms\Database::fieldNamesWithAlias ( $fields )

protected

Gets an array of aliased field names.

Parameters

array $fields [ [alias] => field ]

Returns: string[] See fieldNameWithAlias()

Definition at line 2999 of file Database.php.

References Wikimedia\Rdbms\Database\fieldNameWithAlias().

Referenced by Wikimedia\Rdbms\Database\selectSQLText().

◆ fieldNameWithAlias()

Wikimedia\Rdbms\Database::fieldNameWithAlias	(	$name,
		$alias = `false`
	)

protected

Get an aliased field name e.g.

fieldName AS newFieldName

Stable to override

Parameters

string	$name	Field name
string \| bool	$alias	Alias (optional)

Returns: string SQL name for aliased field. Will not alias a field to its own name

Definition at line 2985 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes().

Referenced by Wikimedia\Rdbms\Database\doInsertSelectGeneric(), and Wikimedia\Rdbms\Database\fieldNamesWithAlias().

◆ flatAtomicSectionList()

Wikimedia\Rdbms\Database::flatAtomicSectionList ( )

private

Returns: string

Definition at line 766 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\assertNoOpenTransactions(), Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\close(), and Wikimedia\Rdbms\Database\commit().

◆ flushSnapshot()

Wikimedia\Rdbms\Database::flushSnapshot	(	$fname = `__METHOD__`,
		$flush = `self::FLUSHING_ONE`
	)

Commit any transaction but error out if writes or callbacks are pending.

This is intended for clearing out REPEATABLE-READ snapshots so that callers can see a new point-in-time of the database. This is useful when one of many transaction rounds finished and significant time will pass in the script's lifetime. It is also useful to call on a replica DB after waiting on replication to catch up to the master.

Parameters

string	$fname	Calling function name
string	$flush	Flush flag, set to situationally valid IDatabase::FLUSHING_* constant to disable warnings about explicitly committing implicit transactions, or calling commit when no transaction is in progress. This will trigger an exception if there is an ongoing explicit transaction. Only set the flush flag if you are sure that these warnings are not applicable, and no explicit transactions are open.

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.28; 1.34 Added $flush parameter

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4695 of file Database.php.

References Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\explicitTrxActive(), Wikimedia\Rdbms\Database\getTransactionRoundId(), Wikimedia\Rdbms\Database\pendingWriteAndCallbackCallers(), Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\writesOrCallbacksPending().

◆ freeResult()

Wikimedia\Rdbms\Database::freeResult ( $res )

Free a result object returned by query() or select()It's usually not necessary to call this, just use unset() or let the variable holding the result object go out of scope.

Parameters

mixed $res A SQL result

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 1740 of file Database.php.

◆ getApproximateLagStatus()

Wikimedia\Rdbms\Database::getApproximateLagStatus ( )

protected

Get a replica DB lag estimate for this server at the start of a transaction.

This is a no-op unless the server is known a priori to be a replica DB

Stable to override

Returns: array ('lag': seconds or false on error, 'since': UNIX timestamp of estimate)

Since: 1.27

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 4906 of file Database.php.

References Wikimedia\Rdbms\Database\getLag().

Referenced by Wikimedia\Rdbms\Database\begin(), and Wikimedia\Rdbms\Database\getSessionLagStatus().

◆ getAttributes()

static Wikimedia\Rdbms\Database::getAttributes ( )

staticprotected

Stable to override.

Returns: array Map of (Database::ATTR_* constant => value)

Since: 1.31

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 530 of file Database.php.

◆ getBindingHandle()

Wikimedia\Rdbms\Database::getBindingHandle ( )

protected

Get the underlying binding connection handle.

Makes sure the connection resource is set (disconnects and ping() failure can unset it). This catches broken callers than catch and ignore disconnection exceptions. Unlike checking isOpen(), this is safe to call inside of open().

Stable to override

Returns: mixed

Exceptions

DBUnexpectedError

Since: 1.26

Reimplemented in Wikimedia\Rdbms\DatabaseMysqli, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5473 of file Database.php.

References Wikimedia\Rdbms\Database\$conn.

Referenced by Wikimedia\Rdbms\DatabasePostgres\addQuotes(), Wikimedia\Rdbms\DatabasePostgres\doQuery(), Wikimedia\Rdbms\DatabasePostgres\fetchObject(), Wikimedia\Rdbms\DatabasePostgres\fetchRow(), Wikimedia\Rdbms\DatabasePostgres\getServerVersion(), Wikimedia\Rdbms\DatabasePostgres\numRows(), and Wikimedia\Rdbms\DatabasePostgres\strencode().

◆ getCacheSetOptions()

static Wikimedia\Rdbms\Database::getCacheSetOptions	(	IDatabase	$db1,
		IDatabase	$db2 = `null`
	)

static

Merge the result of getSessionLagStatus() for several DBs using the most pessimistic values to estimate the lag of any data derived from them in combination.

This is information is useful for caching modules

See also: WANObjectCache::set(); WANObjectCache::getWithSetCallback()

Parameters

IDatabase	$db1
IDatabase \| null	$db2	[optional]

Returns

array Map of values:

lag: highest lag of any of the DBs or false on error (e.g. replication stopped)
since: oldest UNIX timestamp of any of the DB lag estimates
pending: whether any of the DBs have uncommitted changes

Exceptions

DBError

Since: 1.27

Definition at line 4932 of file Database.php.

References $res, and Wikimedia\Rdbms\IDatabase\getSessionLagStatus().

◆ getClass()

static Wikimedia\Rdbms\Database::getClass	(	$dbType,
		$driver = `null`
	)

staticprivate

Parameters

string	$dbType	A possible DB type (sqlite, mysql, postgres,...)
string \| null	$driver	Optional name of a specific DB client driver

Returns: string Database subclass name to use

Exceptions

InvalidArgumentException

Definition at line 478 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\attributesFromType(), and Wikimedia\Rdbms\Database\factory().

◆ getDBname()

Wikimedia\Rdbms\Database::getDBname ( )

Get the current DB name.

Returns: string|null

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2804 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseSqlite\attachDatabasesFromTableAliases(), Wikimedia\Rdbms\Database\dbSchema(), Wikimedia\Rdbms\DatabaseMysqlBase\doSelectDomain(), Wikimedia\Rdbms\DatabasePostgres\doSelectDomain(), Wikimedia\Rdbms\DatabaseSqlite\doSelectDomain(), Wikimedia\Rdbms\DatabaseSqlite\getDbFilePath(), Wikimedia\Rdbms\Database\getLogContext(), and Wikimedia\Rdbms\DatabaseMysqlBase\listViews().

◆ getDefaultSchemaVars()

Wikimedia\Rdbms\Database::getDefaultSchemaVars ( )

protected

Get schema variables to use if none have been set via setSchemaVars().

Override this in derived classes to provide variables for tables.sql and SQL patch files.

Stable to override

Returns: array

Definition at line 5200 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\getSchemaVars().

◆ getDomainID()

Wikimedia\Rdbms\Database::getDomainID ( )

Return the currently selected domain ID.

Null components (database/schema) might change once a connection is established

Returns: string

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 823 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseSqlite\__construct(), Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\executeQueryAttempt(), Wikimedia\Rdbms\Database\handleSessionLossPreconnect(), and Wikimedia\Rdbms\Database\rollback().

◆ getFlag()

Wikimedia\Rdbms\Database::getFlag ( $flag )

Returns a boolean whether the flag $flag is set for this connection.

Parameters

int $flag One of the class IDatabase::DBO_* constants

Returns: bool

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 819 of file Database.php.

◆ getInfinity()

Wikimedia\Rdbms\Database::getInfinity ( )

Find out when 'infinity' is.Most DBMSes support this. This is a special keyword for timestamps in PostgreSQL, and works with CHAR(14) as well because "i" sorts after all numbers.

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5387 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\decodeExpiry(), and Wikimedia\Rdbms\Database\encodeExpiry().

◆ getLag()

Wikimedia\Rdbms\Database::getLag ( )

Get the amount of replication lag for this database server.

Callers should avoid using this method while a transaction is active

Returns: int|bool Database replication lag in seconds or false on error

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4949 of file Database.php.

References Wikimedia\Rdbms\Database\doGetLag().

Referenced by Wikimedia\Rdbms\Database\getApproximateLagStatus().

◆ getLastPHPError()

Wikimedia\Rdbms\Database::getLastPHPError ( )

protected

Returns: string|bool Last PHP error for this DB (typically connection errors)

Definition at line 873 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabasePostgres\lastError(), and Wikimedia\Rdbms\Database\restoreErrorHandler().

◆ getLazyMasterHandle()

Wikimedia\Rdbms\Database::getLazyMasterHandle ( )

protected

Get a handle to the master server of the cluster to which this server belongs.

Returns: IDatabase|null

Since: 1.27

Definition at line 649 of file Database.php.

References Wikimedia\Rdbms\Database\$lazyMasterHandle.

◆ getLBInfo()

Wikimedia\Rdbms\Database::getLBInfo ( $name = null )

Get properties passed down from the server info array of the load balancer.

Parameters

string | null $name The entry of the info array to get, or null to get the whole array

Returns: array|mixed|null

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 617 of file Database.php.

References Wikimedia\Rdbms\Database\$lbInfo.

Referenced by Wikimedia\Rdbms\LoadBalancer\applyTransactionRoundFlags(), Wikimedia\Rdbms\Database\getReadOnlyReason(), Wikimedia\Rdbms\Database\getTransactionRoundId(), and Wikimedia\Rdbms\LoadBalancer\undoTransactionRoundFlags().

◆ getLogContext()

Wikimedia\Rdbms\Database::getLogContext ( array $extras = [] )

protected

Create a log context to pass to PSR-3 logger functions.

Parameters

array $extras Additional data to add to context

Returns: array

Definition at line 901 of file Database.php.

References Wikimedia\Rdbms\Database\getDBname().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\getLagFromPtHeartbeat(), Wikimedia\Rdbms\Database\getQueryExceptionAndLog(), Wikimedia\Rdbms\DatabaseMysqlBase\masterPosWait(), Wikimedia\Rdbms\Database\newExceptionAfterConnectError(), and Wikimedia\Rdbms\DatabaseSqlite\open().

◆ getMasterPos()

Wikimedia\Rdbms\Database::getMasterPos ( )

Get the position of this master.

Returns: DBMasterPos|bool False if this is not a master

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3891 of file Database.php.

◆ getQueryException()

Wikimedia\Rdbms\Database::getQueryException	(	$error,
		$errno,
		$sql,
		$fname
	)

private

Parameters

string	$error
string \| int	$errno
string	$sql
string	$fname

Returns: DBError

Definition at line 1707 of file Database.php.

References Wikimedia\Rdbms\Database\wasConnectionError(), and Wikimedia\Rdbms\Database\wasQueryTimeout().

Referenced by Wikimedia\Rdbms\Database\executeQuery(), and Wikimedia\Rdbms\Database\getQueryExceptionAndLog().

◆ getQueryExceptionAndLog()

Wikimedia\Rdbms\Database::getQueryExceptionAndLog	(	$error,
		$errno,
		$sql,
		$fname
	)

private

Parameters

string	$error
string \| int	$errno
string	$sql
string	$fname

Returns: DBError

Definition at line 1683 of file Database.php.

References Wikimedia\Rdbms\Database\getLogContext(), and Wikimedia\Rdbms\Database\getQueryException().

Referenced by Wikimedia\Rdbms\Database\reportQueryError().

◆ getQueryVerb()

Wikimedia\Rdbms\Database::getQueryVerb ( $sql )

protected

Parameters

string $sql

Returns: string|null

Definition at line 1100 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\assertQueryIsCurrentlyAllowed(), Wikimedia\Rdbms\Database\isTransactableQuery(), Wikimedia\Rdbms\DatabaseSqlite\isTransactableQuery(), and Wikimedia\Rdbms\Database\updateTrxWriteQueryTime().

◆ getReadOnlyReason()

Wikimedia\Rdbms\Database::getReadOnlyReason ( )

protected

Returns: array|bool Tuple of (read-only reason, "role" or "lb") or false if it is not

Definition at line 5420 of file Database.php.

References Wikimedia\Rdbms\Database\getLBInfo().

Referenced by Wikimedia\Rdbms\Database\assertIsWritableMaster(), and Wikimedia\Rdbms\Database\isReadOnly().

◆ getRecordedTransactionLagStatus()

Wikimedia\Rdbms\Database::getRecordedTransactionLagStatus ( )

finalprotected

Get the replica DB lag when the current transaction started.

This is useful when transactions might use snapshot isolation (e.g. REPEATABLE-READ in innodb), so the "real" lag of that data is this lag plus transaction duration. If they don't, it is still safe to be pessimistic. This returns null if there is no transaction.

This returns null if the lag status for this transaction was not yet recorded.

Returns: array|null ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)

Since: 1.27

Definition at line 4891 of file Database.php.

References Wikimedia\Rdbms\Database\$trxReplicaLag, Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\trxTimestamp().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\getLagFromPtHeartbeat(), and Wikimedia\Rdbms\Database\getSessionLagStatus().

◆ getReplicaPos()

Wikimedia\Rdbms\Database::getReplicaPos ( )

Get the replication position of this replica DB.

Returns: DBMasterPos|bool False if this is not a replica DB

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3882 of file Database.php.

◆ getSchemaVars()

Wikimedia\Rdbms\Database::getSchemaVars ( )

protected

Get schema variables.

If none have been set via setSchemaVars(), then use some defaults from the current object.

Returns: array

Definition at line 5187 of file Database.php.

References Wikimedia\Rdbms\Database\getDefaultSchemaVars().

Referenced by Wikimedia\Rdbms\Database\replaceVars().

◆ getScopedLockAndFlush()

Wikimedia\Rdbms\Database::getScopedLockAndFlush	(	$lockKey,
		$fname,
		$timeout
	)

Acquire a named lock, flush any transaction, and return an RAII style unlocker object.

Only call this from outer transcation scope and when only one DB will be affected. See https://www.mediawiki.org/wiki/Database_transactions for details.

This is suitiable for transactions that need to be serialized using cooperative locks, where each transaction can see each others' changes. Any transaction is flushed to clear out stale REPEATABLE-READ snapshot data. Once the returned object falls out of PHP scope, the lock will be released unless a transaction is active. If one is active, then the lock will be released when it either commits or rolls back.

If the lock acquisition failed, then no transaction flush happens, and null is returned.

Parameters

string	$lockKey	Name of lock to release
string	$fname	Name of the calling method
int	$timeout	Acquisition timeout in seconds

Returns: ScopedCallback|null

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.27

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5235 of file Database.php.

References Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\lock(), Wikimedia\Rdbms\Database\onTransactionResolution(), Wikimedia\Rdbms\Database\pendingWriteAndCallbackCallers(), Wikimedia\Rdbms\Database\trxLevel(), Wikimedia\Rdbms\Database\unlock(), and Wikimedia\Rdbms\Database\writesOrCallbacksPending().

◆ getServer()

Wikimedia\Rdbms\Database::getServer ( )

Get the server hostname or IP address.

Returns: string

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2808 of file Database.php.

References Wikimedia\Rdbms\Database\$server.

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt(), Wikimedia\Rdbms\DatabaseMysqlBase\getApproximateLagStatus(), Wikimedia\Rdbms\DatabaseMysqlBase\getMasterServerInfo(), Wikimedia\Rdbms\Database\replaceLostConnection(), and Wikimedia\Rdbms\LoadBalancer\reportConnectionError().

◆ getServerInfo()

Wikimedia\Rdbms\Database::getServerInfo ( )

Get a human-readable string describing the current software version.

Use getServerVersion() to get machine-friendly information.

Returns: string Version information from the database server

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 545 of file Database.php.

References Wikimedia\Rdbms\IDatabase\getServerVersion().

◆ getServerUptime()

Wikimedia\Rdbms\Database::getServerUptime ( )

Determines how long the server has been up.

Returns: int

Exceptions

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\ignoreIndexClause(), Wikimedia\Rdbms\DatabaseMysqlBase\indexInfo(), Wikimedia\Rdbms\DatabaseSqlite\indexInfo(), Wikimedia\Rdbms\DatabasePostgres\indexUnique(), Wikimedia\Rdbms\DatabaseSqlite\indexUnique(), Wikimedia\Rdbms\Database\replaceVars(), and Wikimedia\Rdbms\DatabaseMysqlBase\useIndexClause().

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3764 of file Database.php.

◆ getSessionLagStatus()

Wikimedia\Rdbms\Database::getSessionLagStatus ( )

Get the replica DB lag when the current transaction started or a general lag estimate if not transaction is active.

This is useful when transactions might use snapshot isolation (e.g. REPEATABLE-READ in innodb), so the "real" lag of that data is this lag plus transaction duration. If they don't, it is still safe to be pessimistic. In AUTOCOMMIT mode, this still gives an indication of the staleness of subsequent reads.

Returns: array ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.27

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4874 of file Database.php.

References Wikimedia\Rdbms\Database\getApproximateLagStatus(), and Wikimedia\Rdbms\Database\getRecordedTransactionLagStatus().

◆ getTempTableWrites()

Wikimedia\Rdbms\Database::getTempTableWrites	(	$sql,
		$pseudoPermanent
	)

protected

Parameters

string	$sql	SQL query
bool	$pseudoPermanent	Treat any table from CREATE TEMPORARY as pseudo-permanent

Returns

array[] List of change n-tuples with:

int: self::TEMP_* constant for temp table operations
string: SQL query verb from $sql
string: Name of the temp table changed in $sql

Definition at line 1134 of file Database.php.

References Wikimedia\Rdbms\Database\$TEMP_NORMAL, and Wikimedia\Rdbms\Database\$TEMP_PSEUDO_PERMANENT.

Referenced by Wikimedia\Rdbms\Database\executeQuery().

◆ getTopologyRole()

Wikimedia\Rdbms\Database::getTopologyRole ( )

Get the replication topology role of this server.

Returns: string One of the class ROLE_* constants

Since: 1.34

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 549 of file Database.php.

References Wikimedia\Rdbms\Database\$topologyRole.

◆ getTopologyRootMaster()

Wikimedia\Rdbms\Database::getTopologyRootMaster ( )

Get the host (or address) of the root master server for the replication topology.

Returns: string|null Master server name or null if not known

Since: 1.34

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 553 of file Database.php.

References Wikimedia\Rdbms\Database\$topologyRootMaster.

◆ getTransactionRoundId()

Wikimedia\Rdbms\Database::getTransactionRoundId ( )

finalprotected

Returns: string|null

Definition at line 690 of file Database.php.

References Wikimedia\Rdbms\Database\getFlag(), and Wikimedia\Rdbms\Database\getLBInfo().

Referenced by Wikimedia\Rdbms\Database\flushSnapshot(), Wikimedia\Rdbms\Database\onTransactionCommitOrIdle(), and Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle().

◆ handleSessionLossPostconnect()

Wikimedia\Rdbms\Database::handleSessionLossPostconnect ( )

private

Clean things up after session (and thus transaction) loss after reconnect.

Definition at line 1614 of file Database.php.

References Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks(), and Wikimedia\Rdbms\Database\runTransactionListenerCallbacks().

Referenced by Wikimedia\Rdbms\Database\replaceLostConnection().

◆ handleSessionLossPreconnect()

Wikimedia\Rdbms\Database::handleSessionLossPreconnect ( )

private

Clean things up after session (and thus transaction) loss before reconnect.

Definition at line 1575 of file Database.php.

References Wikimedia\Rdbms\Database\consumeTrxShortId(), Wikimedia\Rdbms\Database\doHandleSessionLossPreconnect(), Wikimedia\Rdbms\Database\getDomainID(), and Wikimedia\Rdbms\Database\pendingWriteQueryDuration().

Referenced by Wikimedia\Rdbms\Database\__clone(), and Wikimedia\Rdbms\Database\replaceLostConnection().

◆ ignoreIndexClause()

Wikimedia\Rdbms\Database::ignoreIndexClause ( $index )

IGNORE INDEX clause.

The inverse of Database::useIndexClause.

Stable to override

Parameters

string $index

Returns: string

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3242 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\makeSelectOptions(), and Wikimedia\Rdbms\Database\tableNamesWithIndexClauseOrJOIN().

◆ implicitOrderby()

Wikimedia\Rdbms\Database::implicitOrderby ( )

Returns true if this database does an implicit order by when the column has an index For example: SELECT page_title FROM page LIMIT 1.

Returns: bool

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 657 of file Database.php.

◆ indexExists()

Wikimedia\Rdbms\Database::indexExists	(	$table,
		$index,
		$fname = `__METHOD__`
	)

Determines whether an index exists.

Parameters

string	$table
string	$index
string	$fname

Returns: bool|null

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2298 of file Database.php.

References Wikimedia\Rdbms\Database\indexInfo(), and Wikimedia\Rdbms\Database\tableExists().

◆ indexInfo()

Wikimedia\Rdbms\Database::indexInfo	(	$table,
		$index,
		$fname = `__METHOD__`
	)

abstract

Get information about an index into an object.

Stable to override

Parameters

string	$table	Table name
string	$index	Index name
string	$fname	Calling function name

Returns: mixed Database-specific index description class or false if the index does not exist

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\indexExists(), and Wikimedia\Rdbms\Database\indexUnique().

◆ indexName()

Wikimedia\Rdbms\Database::indexName ( $index )

protected

Allows for index remapping in queries where this is not consistent across DBMS.

Parameters

string $index

Returns: string

Definition at line 3116 of file Database.php.

◆ indexUnique()

Wikimedia\Rdbms\Database::indexUnique	(	$table,
		$index,
		$fname = `__METHOD__`
	)

Determines if a given index is unique.

Parameters

string	$table
string	$index
string	$fname	Calling function name

Returns: bool

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2317 of file Database.php.

References Wikimedia\Rdbms\Database\indexInfo().

◆ initConnection()

Wikimedia\Rdbms\Database::initConnection ( )

final

Initialize the connection to the database over the wire (or to local files)

Exceptions

LogicException
InvalidArgumentException
DBConnectionError

Since: 1.31

Definition at line 314 of file Database.php.

References Wikimedia\Rdbms\Database\doInitConnection(), and Wikimedia\Rdbms\Database\isOpen().

◆ insert()

Wikimedia\Rdbms\Database::insert	(	$table,
		$rows,
		$fname = `__METHOD__`,
		$options = `[]`
	)

Insert the given row(s) into a table.

Parameters

string	$table	Table name
array \| array[]	$rows	Row(s) to insert, as either: A string-keyed map of (column name => value) defining a new row. Values are treated as literals and quoted appropriately; null is interpreted as NULL. An integer-keyed list of such string-keyed maps, defining a list of new rows. The keys in each map must be identical to each other and in the same order. The rows must not collide with each other.
string	$fname	Calling function name (use METHOD) for logs/profiling
string \| array	$options	Combination map/list where each string-keyed entry maps a non-boolean option to the option parameters and each integer-keyed value is the name of a boolean option. Supported options are: IGNORE: Boolean: skip insertion of rows that would cause unique key conflicts. IDatabase::affectedRows() can be used to determine how many rows were inserted.

Returns: bool Return true if no exception was thrown (deprecated since 1.33)

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2327 of file Database.php.

References Wikimedia\Rdbms\Database\doInsert(), Wikimedia\Rdbms\Database\doInsertNonConflicting(), Wikimedia\Rdbms\Database\isFlagInOptions(), Wikimedia\Rdbms\Database\normalizeOptions(), and Wikimedia\Rdbms\Database\normalizeRowArray().

Referenced by Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doReplace(), and Wikimedia\Rdbms\Database\doUpsert().

◆ insertSelect()

Wikimedia\Rdbms\Database::insertSelect	(	$destTable,
		$srcTable,
		$varMap,
		$conds,
		$fname = `__METHOD__`,
		$insertOptions = `[]`,
		$selectOptions = `[]`,
		$selectJoinConds = `[]`
	)

final

INSERT SELECT wrapper.

Warning: If the insert will use an auto-increment or sequence to determine the value of a column, this may break replication on databases using statement-based replication if the SELECT is not deterministically ordered.

Parameters

string	$destTable	The table name to insert into
string \| array	$srcTable	May be either a table name, or an array of table names to include in a join.
array	$varMap	Must be an associative array of the form [ 'dest1' => 'source1', ... ]. Source items may be literals rather than field names, but strings should be quoted with IDatabase::addQuotes()
array	$conds	Condition array. See $conds in IDatabase::select() for the details of the format of condition arrays. May be "*" to copy the whole table.
string	$fname	The function name of the caller, from METHOD
array	$insertOptions	Options for the INSERT part of the query, see IDatabase::insert() for details. Also, one additional option is available: pass 'NO_AUTO_COLUMNS' to hint that the query does not use an auto-increment or sequence to determine any column values.
array	$selectOptions	Options for the SELECT part of the query, see IDatabase::select() for details.
array	$selectJoinConds	Join conditions for the SELECT part of the query, see IDatabase::select() for details.

Returns: bool Return true if no exception was thrown (deprecated since 1.33)

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3470 of file Database.php.

References Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doInsertSelectNative(), Wikimedia\Rdbms\Database\isInsertSelectSafe(), and Wikimedia\Rdbms\Database\normalizeOptions().

◆ installErrorHandler()

Wikimedia\Rdbms\Database::installErrorHandler ( )

protected

Set a custom error handler for logging errors during database connection.

Definition at line 850 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\open(), and Wikimedia\Rdbms\DatabasePostgres\open().

◆ isFlagInOptions()

Wikimedia\Rdbms\Database::isFlagInOptions	(		$option,
		array	$options
	)

finalprotected

Parameters

string	$option	Query option flag (e.g. "IGNORE" or "FOR UPDATE")
array	$options	Combination option/value map and boolean option list

Returns: bool Whether the option appears as an integer-keyed value in the options

Since: 1.35

Definition at line 2246 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\doInsertSelectNative(), and Wikimedia\Rdbms\Database\insert().

◆ isInsertSelectSafe()

Wikimedia\Rdbms\Database::isInsertSelectSafe	(	array	$insertOptions,
		array	$selectOptions
	)

protected

Stable to override.

Parameters

array	$insertOptions	INSERT options
array	$selectOptions	SELECT options

Returns: bool Whether an INSERT SELECT with these options will be replication safe

Since: 1.31

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3521 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\insertSelect().

◆ isOpen()

Wikimedia\Rdbms\Database::isOpen ( )

Returns: bool Whether a connection to the database open

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 772 of file Database.php.

References Wikimedia\Rdbms\Database\$conn.

Referenced by Wikimedia\Rdbms\Database\__clone(), Wikimedia\Rdbms\Database\assertHasConnectionHandle(), Wikimedia\Rdbms\Database\initConnection(), Wikimedia\Rdbms\Database\ping(), and Wikimedia\Rdbms\DatabaseSqlite\setTableAliases().

◆ isPristineTemporaryTable()

Wikimedia\Rdbms\Database::isPristineTemporaryTable ( $table )

protected

Check if the table is both a TEMPORARY table and has not yet received CRUD operations.

Parameters

string $table

Returns: bool

Since: 1.35

Definition at line 1221 of file Database.php.

References Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\truncate().

◆ isQuotedIdentifier()

Wikimedia\Rdbms\Database::isQuotedIdentifier ( $name )

Returns if the given identifier looks quoted or not according to the database convention for quoting identifiers.

Stable to override

Note: Do not use this to determine if untrusted input is safe. A malicious user can trick this function.

Parameters

string $name

Returns: bool

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3157 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\prependDatabaseOrSchema(), and Wikimedia\Rdbms\Database\tableName().

◆ isReadOnly()

Wikimedia\Rdbms\Database::isReadOnly ( )

Returns: bool Whether this DB is read-only

Since: 1.27

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5413 of file Database.php.

References Wikimedia\Rdbms\Database\getReadOnlyReason().

◆ isTransactableQuery()

Wikimedia\Rdbms\Database::isTransactableQuery ( $sql )

protected

Determine whether a SQL statement is sensitive to isolation level.

A SQL statement is considered transactable if its result could vary depending on the transaction isolation level. Operational commands such as 'SET' and 'SHOW' are not considered to be transactable.

Main purpose: Used by query() to decide whether to begin a transaction before the current query (in DBO_TRX mode, on by default).

Stable to override

Parameters

string $sql

Returns: bool

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 1118 of file Database.php.

References Wikimedia\Rdbms\Database\getQueryVerb().

Referenced by Wikimedia\Rdbms\Database\beginIfImplied().

◆ isWriteQuery()

Wikimedia\Rdbms\Database::isWriteQuery	(	$sql,
		$flags
	)

protected

Determine whether a query writes to the DB.

When in doubt, this returns true.

Main use cases:

Subsequent web requests should not need to wait for replication from the master position seen by this web request, unless this request made changes to the master. This is handled by ChronologyProtector by checking doneWrites() at the end of the request. doneWrites() returns true if any query set lastWriteTime; which query() does based on isWriteQuery().
Reject write queries to replica DBs, in query().

Parameters

string	$sql
int	$flags	Query flags to query()

Returns: bool

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 1068 of file Database.php.

References Wikimedia\Rdbms\Database\$flags, and Wikimedia\Rdbms\Database\fieldHasBit().

Referenced by Wikimedia\Rdbms\Database\executeQuery().

◆ lastDoneWrites()

Wikimedia\Rdbms\Database::lastDoneWrites ( )

Get the last time the connection may have been used for a write query.

Returns: int|float UNIX timestamp or false

Since: 1.24

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 665 of file Database.php.

◆ lastQuery()

Wikimedia\Rdbms\Database::lastQuery ( )

Get the last query that sent on account of IDatabase::query()

Returns: string SQL text or empty string if there was no such query

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 661 of file Database.php.

References Wikimedia\Rdbms\Database\$lastQuery.

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt().

◆ limitResult()

Wikimedia\Rdbms\Database::limitResult	(	$sql,
		$limit,
		$offset = `false`
	)

Construct a LIMIT query with optional offset.The SQL should be adjusted so that only the first $limit rows are returned. If $offset is provided as well, then the first $offset rows should be discarded, and the next $limit rows should be returned. If the result of the query is not ordered, then the rows to be returned are theoretically arbitrary.$sql is expected to be a SELECT, if that makes a difference.

Parameters

string	$sql	SQL query we will append the limit too
int	$limit	The SQL limit
int \| bool	$offset	The SQL offset (default false)

Returns: string

Since: 1.34

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 3637 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\selectSQLText(), and Wikimedia\Rdbms\Database\unionConditionPermutations().

◆ listTables()

Wikimedia\Rdbms\Database::listTables	(	$prefix = `null`,
		$fname = `__METHOD__`
	)

List all tables on the database.

Parameters

string \| null	$prefix	Only show tables with this prefix, e.g. mw_
string	$fname	Calling function name

Exceptions

Returns: array

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 4745 of file Database.php.

◆ listViews()

Wikimedia\Rdbms\Database::listViews	(	$prefix = `null`,
		$fname = `__METHOD__`
	)

Lists all the VIEWs in the database.

Parameters

string \| null	$prefix	Only show VIEWs with this prefix, eg. unit_test_
string	$fname	Name of calling function

Exceptions

RuntimeException

Returns: array

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 4753 of file Database.php.

◆ lock()

Wikimedia\Rdbms\Database::lock	(	$lockName,
		$method,
		$timeout = `5`
	)

Acquire a named lock.Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to aquire
string	$method	Name of the calling method
int	$timeout	Acquisition timeout in seconds (0 means non-blocking)

Returns: bool Success

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5219 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\getScopedLockAndFlush().

◆ lockForUpdate()

Wikimedia\Rdbms\Database::lockForUpdate	(	$table,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Lock all rows meeting the given conditions/options FOR UPDATE.

Parameters

string \| string[]	$table	Table name(s)
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select ("FOR UPDATE" is added automatically)
array	$join_conds	Join conditions

Returns: int Number of matching rows found (and locked)

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2276 of file Database.php.

References Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\selectRowCount(), and Wikimedia\Rdbms\Database\trxLevel().

◆ lockIsFree()

Wikimedia\Rdbms\Database::lockIsFree	(	$lockName,
		$method
	)

Check to see if a named lock is not locked by any thread (non-blocking)

Parameters

string	$lockName	Name of lock to poll
string	$method	Name of method calling us

Returns: bool

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.20

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabasePostgres.

Definition at line 5208 of file Database.php.

◆ lockTables()

Wikimedia\Rdbms\Database::lockTables	(	array	$read,
		array	$write,
			$method
	)

final

Lock specific tables.

Any pending transaction should be resolved before calling this method, since: a) Doing so resets any REPEATABLE-READ snapshot of the data to a fresh one. b) Previous row and table locks from the transaction or session may be released by LOCK TABLES, which may be unsafe for the changes in such a transaction. c) The main use case of lockTables() is to avoid deadlocks and timeouts by locking entire tables in order to do long-running, batched, and lag-aware, updates. Batching and replication lag checks do not work when all the updates happen in a transaction.

Always get all relevant table locks up-front in one call, since LOCK TABLES might release any prior table locks on some RDBMes (e.g MySQL).

For compatibility, callers should check tableLocksHaveTransactionScope() before using this method. If locks are scoped specifically to transactions then caller must either:

a) Start a new transaction and acquire table locks for the scope of that transaction, doing all row updates within that transaction. It will not be possible to update rows in batches; this might result in high replication lag.
b) Forgo table locks entirely and avoid calling this method. Careful use of hints like LOCK IN SHARE MODE and FOR UPDATE and the use of query batching may be preferrable to using table locks with a potentially large transaction. Use of MySQL and Postges style REPEATABLE-READ (Snapshot Isolation with or without First-Committer-Rule) can also be considered for certain tasks that require a consistent view of entire tables.

If session scoped locks are not supported, then calling lockTables() will trigger startAtomic(), with unlockTables() triggering endAtomic(). This will automatically start a transaction if one is not already present and cause the locks to be released when the transaction finishes (normally during the unlockTables() call).

In any case, avoid using begin()/commit() in code that runs while such table locks are acquired, as that breaks in case when a transaction is needed. The startAtomic() and endAtomic() methods are safe, however, since they will join any existing transaction.

Parameters

array	$read	Array of tables to lock for read access
array	$write	Array of tables to lock for write access
string	$method	Name of caller

Returns: bool

Since: 1.29

Definition at line 5283 of file Database.php.

References Wikimedia\Rdbms\Database\doLockTables(), Wikimedia\Rdbms\Database\startAtomic(), Wikimedia\Rdbms\Database\tableLocksHaveTransactionScope(), and Wikimedia\Rdbms\Database\writesOrCallbacksPending().

◆ makeConditionCollidesUponKey()

Wikimedia\Rdbms\Database::makeConditionCollidesUponKey	(	array	$rows,
		array	$uniqueKey
	)

private

Parameters

array[]	$rows	Non-empty list of rows
string[]	$uniqueKey	List of columns that define a single unique index

Returns: string SQL conditions to filter existing rows to those with counterparts in $rows

Definition at line 3299 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\makeConditionCollidesUponKeys().

◆ makeConditionCollidesUponKeys()

Wikimedia\Rdbms\Database::makeConditionCollidesUponKeys	(	array	$rows,
		array	$uniqueKeys
	)

finalprotected

Parameters

array[]	$rows	Non-empty list of rows
string[][]	$uniqueKeys	List of column lists that each define a unique index

Returns: string SQL conditions to filter existing rows to those with counterparts in $rows

Since: 1.35

Definition at line 3340 of file Database.php.

References Wikimedia\Rdbms\Database\makeConditionCollidesUponKey(), and Wikimedia\Rdbms\Database\makeList().

Referenced by Wikimedia\Rdbms\Database\doReplace(), and Wikimedia\Rdbms\Database\doUpsert().

◆ makeGroupByWithHaving()

Wikimedia\Rdbms\Database::makeGroupByWithHaving ( $options )

protected

Returns an optional GROUP BY with an optional HAVING.

Parameters

array $options Associative array of options

Returns: string

See also: Database::select()

Since: 1.21

Definition at line 1878 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\makeSelectOptions(), and Wikimedia\Rdbms\DatabasePostgres\makeSelectOptions().

◆ makeInsertLists()

Wikimedia\Rdbms\Database::makeInsertLists ( array $rows )

protected

Make SQL lists of columns, row tuples for INSERT/VALUES expressions.

The tuple column order is that of the columns of the first provided row. The provided rows must have exactly the same keys and ordering thereof.

Parameters

array[] $rows Non-empty list of (column => value) maps

Returns: array (comma-separated columns, comma-separated tuples)

Since: 1.35

Definition at line 2397 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\doInsert(), Wikimedia\Rdbms\Database\doInsertNonConflicting(), Wikimedia\Rdbms\DatabasePostgres\doInsertNonConflicting(), Wikimedia\Rdbms\DatabaseMysqlBase\doReplace(), Wikimedia\Rdbms\DatabaseSqlite\doReplace(), and Wikimedia\Rdbms\DatabaseMysqlBase\doUpsert().

◆ makeInsertNonConflictingVerbAndOptions()

Wikimedia\Rdbms\Database::makeInsertNonConflictingVerbAndOptions ( )

protected

Stable to override.

Returns: string[] ("INSERT"-style SQL verb, "ON CONFLICT"-style clause or "")

Since: 1.35

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2383 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\doInsertNonConflicting(), and Wikimedia\Rdbms\Database\doInsertSelectNative().

◆ makeList()

Wikimedia\Rdbms\Database::makeList	(	array	$a,
			$mode = `self::LIST_COMMA`
	)

Makes an encoded list of strings from an array.

These can be used to make conjunctions or disjunctions on SQL condition strings derived from an array (see IDatabase::select() $conds documentation).

Example usage:

$sql = $db->makeList( [
    'rev_page' => $id,
    $db->makeList( [ 'rev_minor' => 1, 'rev_len' < 500 ], $db::LIST_OR ] )
], $db::LIST_AND );

This would set $sql to "rev_page = '$id' AND (rev_minor = '1' OR rev_len < '500')"

Parameters

array	$a	Containing the data
int	$mode	IDatabase class constant: IDatabase::LIST_COMMA: Comma separated, no field names IDatabase::LIST_AND: ANDed WHERE clause (without the WHERE). IDatabase::LIST_OR: ORed WHERE clause (without the WHERE) IDatabase::LIST_SET: Comma separated with field names, like a SET clause IDatabase::LIST_NAMES: Comma separated field names

Exceptions

DBError If an error occurs, see IDatabase::query()

Returns: string

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2476 of file Database.php.

References Wikimedia\Rdbms\Database\addQuotes(), and Wikimedia\Rdbms\Database\makeList().

◆ makeOrderBy()

Wikimedia\Rdbms\Database::makeOrderBy ( $options )

protected

Returns an optional ORDER BY.

Parameters

array $options Associative array of options

Returns: string

See also: Database::select()

Since: 1.21

Definition at line 1904 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\makeSelectOptions(), Wikimedia\Rdbms\DatabasePostgres\makeSelectOptions(), and Wikimedia\Rdbms\Database\unionConditionPermutations().

◆ makeSelectOptions()

Wikimedia\Rdbms\Database::makeSelectOptions ( array $options )

protected

Returns an optional USE INDEX clause to go after the table, and a string to go at the end of the query.

See also: Database::select()

Stable to override

Parameters

array $options Associative array of options to be turned into an SQL query, valid keys are listed in the function.

Returns: array

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 1807 of file Database.php.

References Wikimedia\Rdbms\Database\ignoreIndexClause(), Wikimedia\Rdbms\Database\makeGroupByWithHaving(), Wikimedia\Rdbms\Database\makeOrderBy(), and Wikimedia\Rdbms\Database\useIndexClause().

Referenced by Wikimedia\Rdbms\Database\selectSQLText().

◆ makeUpdateOptions()

Wikimedia\Rdbms\Database::makeUpdateOptions ( $options )

protected

Make UPDATE options for the Database::update function.

Stable to override

Parameters

array $options The options passed to Database::update

Returns: string

Definition at line 2452 of file Database.php.

References Wikimedia\Rdbms\Database\makeUpdateOptionsArray().

Referenced by Wikimedia\Rdbms\Database\update().

◆ makeUpdateOptionsArray()

Wikimedia\Rdbms\Database::makeUpdateOptionsArray ( $options )

protected

Make UPDATE options array for Database::makeUpdateOptions.

Stable to override

Parameters

array $options

Returns: array

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2433 of file Database.php.

References Wikimedia\Rdbms\Database\normalizeOptions().

Referenced by Wikimedia\Rdbms\Database\makeUpdateOptions().

◆ makeWhereFrom2d()

Wikimedia\Rdbms\Database::makeWhereFrom2d	(	$data,
		$baseKey,
		$subKey
	)

Build a partial where clause from a 2-d array such as used for LinkBatch.

The keys on each level may be either integers or strings, however it's assumed that $baseKey is probably an integer-typed column (i.e. integer keys are unquoted in the SQL) and $subKey is string-typed (i.e. integer keys are quoted as strings in the SQL).

Todo:: Does this actually belong in the library? It seems overly MW-specific.

Parameters

array	$data	Organized as 2-d [ baseKeyVal => [ subKeyVal => [ignored], ... ], ... ]
string	$baseKey	Field name to match the base-level keys to (eg 'pl_namespace')
string	$subKey	Field name to match the sub-level keys to (eg 'pl_title')

Returns: string|bool SQL fragment, or false if no items in array

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2552 of file Database.php.

References $base, and Wikimedia\Rdbms\Database\makeList().

◆ masterPosWait()

Wikimedia\Rdbms\Database::masterPosWait	(	DBMasterPos	$pos,
			$timeout
	)

Wait for the replica DB to catch up to a given master position.Note that this does not start any new transactions. If any existing transaction is flushed, and this is called, then queries will reflect the point the DB was synced up to (on success) without interference from REPEATABLE-READ snapshots.

Parameters

DBMasterPos	$pos
int	$timeout	The maximum number of seconds to wait for synchronisation

Returns: int|null Zero if the replica DB was past that position already, greater than zero if we waited for some period of time, less than zero if it timed out, and null on error

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 3873 of file Database.php.

◆ maxListLen()

Wikimedia\Rdbms\Database::maxListLen ( )

Return the maximum number of items allowed in a list, or 0 for unlimited.

Returns: int

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4971 of file Database.php.

◆ modifyCallbacksForCancel()

Wikimedia\Rdbms\Database::modifyCallbacksForCancel	(	array	$sectionIds,
		AtomicSectionIdentifier	$newSectionId = `null`
	)

private

Update callbacks that were owned by cancelled atomic sections.

Callbacks for "on commit" should never be run if they're owned by a section that won't be committed.

Callbacks for "on resolution" need to reflect that the section was rolled back, even if the transaction as a whole commits successfully.

Callbacks for "on section cancel" should already have been consumed, but errors during the cancellation itself can prevent that while still destroying the section. Hoist any such callbacks to the new top section, which we assume will itself have to be cancelled or rolled back to resolve the error.

Parameters

AtomicSectionIdentifier[]	$sectionIds	ID of an actual savepoint
AtomicSectionIdentifier \| null	$newSectionId	New top section ID.

Exceptions

UnexpectedValueException

Definition at line 4020 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\cancelAtomic().

◆ namedLocksEnqueue()

Wikimedia\Rdbms\Database::namedLocksEnqueue ( )

Check to see if a named lock used by lock() use blocking queues.

Returns: bool

Since: 1.26

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 5275 of file Database.php.

◆ newExceptionAfterConnectError()

Wikimedia\Rdbms\Database::newExceptionAfterConnectError ( $error )

finalprotected

Parameters

string $error

Returns: DBConnectionError

Definition at line 1721 of file Database.php.

References Wikimedia\Rdbms\Database\getLogContext().

Referenced by Wikimedia\Rdbms\DatabaseMysqli\mysqlConnect(), Wikimedia\Rdbms\DatabaseSqlite\open(), Wikimedia\Rdbms\DatabaseMysqlBase\open(), and Wikimedia\Rdbms\DatabasePostgres\open().

◆ newSelectQueryBuilder()

Wikimedia\Rdbms\Database::newSelectQueryBuilder ( )

Create an empty SelectQueryBuilder which can be used to run queries against this connection.

Returns: SelectQueryBuilder

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1746 of file Database.php.

◆ nextSavepointId()

Wikimedia\Rdbms\Database::nextSavepointId ( $fname )

private

Parameters

string $fname

Returns: string

Definition at line 4304 of file Database.php.

References Wikimedia\Rdbms\Database\$trxAtomicCounter.

Referenced by Wikimedia\Rdbms\Database\startAtomic().

◆ nextSequenceValue()

Wikimedia\Rdbms\Database::nextSequenceValue ( $seqName )

Deprecated method, calls should be removed.

This was formerly used for PostgreSQL to handle self::insertId() auto-incrementing fields. It is no longer necessary since DatabasePostgres::insertId() has been reimplemented using lastval()

Implementations should return null if inserting NULL into an auto-incrementing field works, otherwise it should return an instance of NextSequenceValue and filter it on calls to relevant methods.

Deprecated:: since 1.30, no longer needed

Parameters

string $seqName

Returns: null|NextSequenceValue

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 3212 of file Database.php.

◆ normalizeConditions()

Wikimedia\Rdbms\Database::normalizeConditions	(	$conds,
		$fname
	)

finalprotected

Parameters

array \| string	$conds
string	$fname

Returns: array

Since: 1.31

Definition at line 2157 of file Database.php.

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\estimateRowCount(), Wikimedia\Rdbms\DatabasePostgres\estimateRowCount(), Wikimedia\Rdbms\Database\estimateRowCount(), and Wikimedia\Rdbms\Database\selectRowCount().

◆ normalizeOptions()

Wikimedia\Rdbms\Database::normalizeOptions ( $options )

finalprotected

Parameters

string | array $options

Returns: array Combination option/value map and boolean option list

Since: 1.35

Definition at line 2230 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\insertSelect(), Wikimedia\Rdbms\Database\makeUpdateOptionsArray(), Wikimedia\Rdbms\DatabasePostgres\makeUpdateOptionsArray(), Wikimedia\Rdbms\Database\selectField(), and Wikimedia\Rdbms\Database\selectFieldValues().

◆ normalizeRowArray()

Wikimedia\Rdbms\Database::normalizeRowArray ( array $rowOrRows )

finalprotected

Parameters

array $rowOrRows A single (field => value) map or a list of such maps

Returns: array[] List of (field => value) maps

Since: 1.35

Definition at line 2131 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\insert(), Wikimedia\Rdbms\Database\replace(), and Wikimedia\Rdbms\Database\upsert().

◆ normalizeUpsertKeys()

Wikimedia\Rdbms\Database::normalizeUpsertKeys ( $uniqueKeys )

finalprotected

Parameters

string | string[] | string[][] $uniqueKeys Unique indexes (first is identity key)

Returns: string[][] Unique indexes as column lists (first index is the identity key)

Since: 1.35

Definition at line 2178 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\replace(), and Wikimedia\Rdbms\Database\upsert().

◆ onAtomicSectionCancel()

Wikimedia\Rdbms\Database::onAtomicSectionCancel	(	callable	$callback,
			$fname = `__METHOD__`
	)

final

Run a callback when the atomic section is cancelled.

The callback is run just after the current atomic section, any outer atomic section, or the whole transaction is rolled back.

An error is thrown if no atomic section is pending. The atomic section need not have been created with the ATOMIC_CANCELABLE flag.

Queries in the function may be running in the context of an outer transaction or may be running in AUTOCOMMIT mode. The callback should use atomic sections if necessary.

Note: do not assume that other IDatabase instances will be AUTOCOMMIT mode

The callback takes the following arguments:

IDatabase::TRIGGER_CANCEL or IDatabase::TRIGGER_ROLLBACK
This IDatabase instance

Parameters

callable	$callback
string	$fname	Caller name

Since: 1.34

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3950 of file Database.php.

References Wikimedia\Rdbms\Database\currentAtomicSectionId(), and Wikimedia\Rdbms\Database\trxLevel().

◆ onTransactionCommitOrIdle()

Wikimedia\Rdbms\Database::onTransactionCommitOrIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

final

Run a callback as soon as there is no transaction pending.

If there is a transaction and it is rolled back, then the callback is cancelled.

When transaction round mode (DBO_TRX) is set, the callback will run at the end of the round, just after all peer transactions COMMIT. If the transaction round is rolled back, then the callback is cancelled.

Queries in the function will run in AUTOCOMMIT mode unless there are begin() calls. Callbacks must commit any transactions that they begin.

This is useful for updates to different systems or when separate transactions are needed. For example, one might want to enqueue jobs into a system outside the database, but only after the database is updated so that the jobs will see the data when they actually run. It can also be used for updates that easily suffer from lock timeouts and deadlocks, but where atomicity is not essential.

Avoid using IDatabase instances aside from this one in the callback, unless such instances never have IDatabase::DBO_TRX set. This keeps callbacks from interfering with one another.

Updates will execute in the order they were enqueued.

Note: do not assume that other IDatabase instances will be AUTOCOMMIT mode

The callback takes the following arguments:

How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_IDLE)
This IDatabase instance (since 1.32)

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError	If an error occurs, see IDatabase::query()
Exception	If the callback runs immediately and an error occurs in it

Since: 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3911 of file Database.php.

References Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\currentAtomicSectionId(), Wikimedia\Rdbms\Database\getTransactionRoundId(), Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\onTransactionIdle().

◆ onTransactionIdle()

Wikimedia\Rdbms\Database::onTransactionIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

final

Alias for onTransactionCommitOrIdle() for backwards-compatibility.

Parameters

callable	$callback
string	$fname

Since: 1.20

Deprecated:: Since 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3924 of file Database.php.

References Wikimedia\Rdbms\Database\onTransactionCommitOrIdle().

◆ onTransactionPreCommitOrIdle()

Wikimedia\Rdbms\Database::onTransactionPreCommitOrIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

final

Run a callback before the current transaction commits or now if there is none.

If there is a transaction and it is rolled back, then the callback is cancelled.

When transaction round mode (DBO_TRX) is set, the callback will run at the end of the round, just before all peer transactions COMMIT. If the transaction round is rolled back, then the callback is cancelled.

Callbacks must not start nor commit any transactions. If no transaction is active, then a transaction will wrap the callback.

This is useful for updates that easily suffer from lock timeouts and deadlocks, but where atomicity is strongly desired for these updates and some related updates.

Updates will execute in the order they were enqueued.

The callback takes the one argument:

This IDatabase instance (since 1.32)

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError	If an error occurs, see IDatabase::query()
Exception	If the callback runs immediately and an error occurs in it

Since: 1.22

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3928 of file Database.php.

References Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\currentAtomicSectionId(), Wikimedia\Rdbms\Database\endAtomic(), Wikimedia\Rdbms\Database\getTransactionRoundId(), Wikimedia\Rdbms\Database\startAtomic(), and Wikimedia\Rdbms\Database\trxLevel().

◆ onTransactionResolution()

Wikimedia\Rdbms\Database::onTransactionResolution	(	callable	$callback,
			$fname = `__METHOD__`
	)

final

Run a callback as soon as the current transaction commits or rolls back.

An error is thrown if no transaction is pending. Queries in the function will run in AUTOCOMMIT mode unless there are begin() calls. Callbacks must commit any transactions that they begin.

This is useful for combining cooperative locks and DB transactions.

Note this is called when the whole transaction is resolved. To take action immediately when an atomic section is cancelled, use onAtomicSectionCancel().

Note: do not assume that other IDatabase instances will be AUTOCOMMIT mode

The callback takes the following arguments:

How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_ROLLBACK)
This IDatabase instance (since 1.32)

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError	If an error occurs, see IDatabase::query()
Exception	If the callback runs immediately and an error occurs in it

Since: 1.28

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3904 of file Database.php.

References Wikimedia\Rdbms\Database\currentAtomicSectionId(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\getScopedLockAndFlush().

◆ open()

Wikimedia\Rdbms\Database::open	(	$server,
		$user,
		$password,
		$dbName,
		$schema,
		$tablePrefix
	)

abstractprotected

Open a new connection to the database (closing any existing one)

Parameters

string \| null	$server	Database server host
string \| null	$user	Database user name
string \| null	$password	Database user password
string \| null	$dbName	Database name
string \| null	$schema	Database schema name
string	$tablePrefix	Table prefix

Exceptions

DBConnectionError

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabasePostgres.

Referenced by Wikimedia\Rdbms\Database\__clone(), Wikimedia\Rdbms\Database\doInitConnection(), and Wikimedia\Rdbms\Database\replaceLostConnection().

◆ pendingWriteAndCallbackCallers()

Wikimedia\Rdbms\Database::pendingWriteAndCallbackCallers ( )

List the methods that have write queries or callbacks for the current transaction.

This method should not be used outside of Database/LoadBalancer

Returns: string[]

Since: 1.32

Definition at line 747 of file Database.php.

References Wikimedia\Rdbms\Database\pendingWriteCallers().

Referenced by Wikimedia\Rdbms\Database\__destruct(), Wikimedia\Rdbms\Database\close(), Wikimedia\Rdbms\Database\flushSnapshot(), and Wikimedia\Rdbms\Database\getScopedLockAndFlush().

◆ pendingWriteCallers()

Wikimedia\Rdbms\Database::pendingWriteCallers ( )

Get the list of method names that did write queries for this transaction.

Returns: array

Since: 1.27

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 731 of file Database.php.

References Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\pendingWriteAndCallbackCallers().

◆ pendingWriteQueryDuration()

Wikimedia\Rdbms\Database::pendingWriteQueryDuration ( $type = self::ESTIMATE_TOTAL )

Get the time spend running write queries for this transaction.

High values could be due to scanning, updates, locking, and such.

Parameters

string $type IDatabase::ESTIMATE_* constant [default: ESTIMATE_ALL]

Returns: float|bool Returns false if not transaction is active

Since: 1.26

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 701 of file Database.php.

References Wikimedia\Rdbms\Database\$trxWriteDuration, $type, Wikimedia\Rdbms\Database\pingAndCalculateLastTrxApplyTime(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\commit(), and Wikimedia\Rdbms\Database\handleSessionLossPreconnect().

◆ pendingWriteRowsAffected()

Wikimedia\Rdbms\Database::pendingWriteRowsAffected ( )

Get the number of affected rows from pending write queries.

Returns: int

Since: 1.30

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 735 of file Database.php.

References Wikimedia\Rdbms\Database\$trxWriteAffectedRows.

◆ ping()

Wikimedia\Rdbms\Database::ping ( & $rtt = null )

Ping the server and try to reconnect if it there is no connection.

Parameters

float | null &$rtt Value to store the estimated RTT [optional]

Returns: bool Success or failure

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4810 of file Database.php.

References Wikimedia\Rdbms\Database\$flags, Wikimedia\Rdbms\Database\$lastRoundTripEstimate, Wikimedia\Rdbms\Database\isOpen(), and Wikimedia\Rdbms\Database\query().

Referenced by Wikimedia\Rdbms\Database\pingAndCalculateLastTrxApplyTime().

◆ pingAndCalculateLastTrxApplyTime()

Wikimedia\Rdbms\Database::pingAndCalculateLastTrxApplyTime ( )

private

Returns: float Time to apply writes to replicas based on trxWrite* fields

Definition at line 719 of file Database.php.

References Wikimedia\Rdbms\Database\$trxWriteAdjQueryCount, and Wikimedia\Rdbms\Database\ping().

Referenced by Wikimedia\Rdbms\Database\pendingWriteQueryDuration(), and Wikimedia\Rdbms\Database\rollback().

◆ preCommitCallbacksPending()

Wikimedia\Rdbms\Database::preCommitCallbacksPending ( )

Returns: bool Whether there is a transaction open with pre-commit callbacks pending

Since: 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 683 of file Database.php.

References Wikimedia\Rdbms\Database\$trxPreCommitCallbacks, and Wikimedia\Rdbms\Database\trxLevel().

◆ prependDatabaseOrSchema()

Wikimedia\Rdbms\Database::prependDatabaseOrSchema	(	$namespace,
		$relation,
		$format
	)

private

Parameters

string \| null	$namespace	Database or schema
string	$relation	Name of table, view, sequence, etc...
string	$format	One of (raw, quoted)

Returns: string Relation name with quoted and merged $namespace as needed

Definition at line 2914 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\isQuotedIdentifier().

Referenced by Wikimedia\Rdbms\Database\tableName().

◆ qualifiedTableComponents()

Wikimedia\Rdbms\Database::qualifiedTableComponents ( $name )

protected

Get the table components needed for a query given the currently selected database.

Parameters

string $name Table name in the form of db.schema.table, db.table, or table

Returns: array (DB name or "" for default, schema name, table prefix, table name)

Definition at line 2874 of file Database.php.

References Wikimedia\Rdbms\Database\relationSchemaQualifier(), and Wikimedia\Rdbms\Database\tablePrefix().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\tableExists(), and Wikimedia\Rdbms\Database\tableName().

◆ query()

Wikimedia\Rdbms\Database::query	(	$sql,
		$fname = `__METHOD__`,
		$flags = `self::QUERY_NORMAL`
	)

Run an SQL query and return the result.

If a connection loss is detected, then an attempt to reconnect will be made. For queries that involve no larger transactions or locks, they will be re-issued for convenience, provided the connection was re-established.

In new code, the query wrappers select(), insert(), update(), delete(), etc. should be used where possible, since they give much better DBMS independence and automatically quote or validate user input in a variety of contexts. This function is generally only useful for queries which are explicitly DBMS-dependent and are unsupported by the query wrappers, such as CREATE TABLE.

However, the query wrappers themselves should call this function.

Parameters

string	$sql	SQL query
string	$fname	Name of the calling function, for profiling/SHOW PROCESSLIST comment (you can use METHOD or add some extra info)
int	$flags	Bitfield of IDatabase::QUERY_* constants. Note that suppression of errors is best handled by try/catch rather than using one of these flags.

Returns: bool|IResultWrapper True for a successful write query, IResultWrapper object for a successful read query, or false on failure if QUERY_SILENCE_ERRORS is set.

Exceptions

DBQueryError	If the query is issued, fails, and QUERY_SILENCE_ERRORS is not set.
DBExpectedError	If the query is not, and cannot, be issued yet (non-DBQueryError)
DBError	If the query is inherently not allowed (non-DBExpectedError)

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1230 of file Database.php.

References Wikimedia\Rdbms\Database\$flags, Wikimedia\Rdbms\Database\assertQueryIsCurrentlyAllowed(), Wikimedia\Rdbms\Database\executeQuery(), Wikimedia\Rdbms\Database\fieldHasBit(), Wikimedia\Rdbms\Database\reportQueryError(), and Wikimedia\Rdbms\Database\resultObject().

◆ reassignCallbacksForSection()

Wikimedia\Rdbms\Database::reassignCallbacksForSection	(	AtomicSectionIdentifier	$old,
		AtomicSectionIdentifier	$new
	)

private

Hoist callback ownership for callbacks in a section to a parent section.

All callbacks should have an owner that is present in trxAtomicLevels.

Parameters

AtomicSectionIdentifier	$old
AtomicSectionIdentifier	$new

Definition at line 3976 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\endAtomic().

◆ registerTempWrites()

Wikimedia\Rdbms\Database::registerTempWrites	(		$ret,
		array	$changes
	)

protected

Parameters

IResultWrapper \| bool	$ret
array[]	$changes	List of change n-tuples with from getTempWrites()

Definition at line 1190 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\executeQuery().

◆ relationSchemaQualifier()

Wikimedia\Rdbms\Database::relationSchemaQualifier ( )

protected

Stable to override.

Returns: string Schema to use to qualify relations in queries

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 613 of file Database.php.

References Wikimedia\Rdbms\Database\dbSchema().

Referenced by Wikimedia\Rdbms\Database\qualifiedTableComponents().

◆ replace()

Wikimedia\Rdbms\Database::replace	(	$table,
		$uniqueKeys,
		$rows,
		$fname = `__METHOD__`
	)

Insert row(s) into a table, deleting all conflicting rows beforehand.

Note some important implications of the deletion semantics:

If the table has an AUTOINCREMENT column and $rows omit that column, then any conflicting existing rows will be replaced with newer having higher values for that column, even if nothing else changed.
There might be worse contention than upsert() due to the use of gap-locking. This does not apply to RDBMS types that use predicate locking nor those that just lock the whole table or databases anyway.

Parameters

string	$table	The table name
string \| string[] \| string[][]	$uniqueKeys	Column name or non-empty list of column name lists that define all applicable unique keys on the table. Each unique key on the table is "applicable" unless either: It involves an AUTOINCREMENT column for which no values are assigned in $rows It involves a UUID column for which newly generated UUIDs are assigned in $rows
array \| array[]	$rows	Row(s) to insert, in the form of either: A string-keyed map of (column name => value) defining a new row. Values are treated as literals and quoted appropriately; null is interpreted as NULL. Columns belonging to a key in $uniqueIndexes must be defined here and non-null. An integer-keyed list of such string-keyed maps, defining a list of new rows. The keys in each map must be identical to each other and in the same order. The rows must not collide with each other.
string	$fname	Calling function name (use METHOD) for logs/profiling

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3246 of file Database.php.

References Wikimedia\Rdbms\Database\doInsert(), Wikimedia\Rdbms\Database\doReplace(), Wikimedia\Rdbms\Database\normalizeRowArray(), and Wikimedia\Rdbms\Database\normalizeUpsertKeys().

◆ replaceLostConnection()

Wikimedia\Rdbms\Database::replaceLostConnection ( $fname )

protected

Close any existing (dead) database connection and open a new connection.

Parameters

string $fname

Returns: bool True if new connection is opened successfully, false if error

Definition at line 4835 of file Database.php.

References Wikimedia\Rdbms\Database\closeConnection(), Wikimedia\Rdbms\Database\getServer(), Wikimedia\Rdbms\Database\handleSessionLossPostconnect(), Wikimedia\Rdbms\Database\handleSessionLossPreconnect(), and Wikimedia\Rdbms\Database\open().

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt().

◆ replaceVars()

Wikimedia\Rdbms\Database::replaceVars ( $ins )

protected

Database independent variable replacement.

Replaces a set of variables in an SQL statement with their contents as given by $this->getSchemaVars().

Supports '{$var}' {$var} and / $var / (without the spaces) style variables.

'{$var}' should be used for text and is passed through the database's addQuotes method.
{$var} should be used for identifiers (e.g. table and database names). It is passed through the database's addIdentifierQuotes method which can be overridden if the database uses something other than backticks.
/ *_* / or / $wgDBprefix / passes the name that follows through the database's tableName method.
/ i / passes the name that follows through the database's indexName method.
In all other cases, / $var / is left unencoded. Except for table options, its use should be avoided. In 1.24 and older, string encoding was applied.

Stable to override

Parameters

string $ins SQL statement to replace variables in

Returns: string The new SQL statement with variables replaced

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5149 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), Wikimedia\Rdbms\Database\addQuotes(), Wikimedia\Rdbms\Database\getSchemaVars(), Wikimedia\Rdbms\Database\indexName(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\sourceStream().

◆ reportQueryError()

Wikimedia\Rdbms\Database::reportQueryError	(	$error,
		$errno,
		$sql,
		$fname,
		$ignore = `false`
	)

Report a query error.

Log the error, and if neither the object ignore flag nor the $ignoreErrors flag is set, throw a DBQueryError.

Parameters

string	$error
int	$errno
string	$sql
string	$fname
bool	$ignore

Exceptions

DBQueryError

Definition at line 1668 of file Database.php.

References Wikimedia\Rdbms\Database\getQueryExceptionAndLog().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\doSelectDomain(), and Wikimedia\Rdbms\Database\query().

◆ restoreErrorHandler()

Wikimedia\Rdbms\Database::restoreErrorHandler ( )

protected

Restore the previous error handler and return the last PHP error for this DB.

Returns: bool|string

Definition at line 861 of file Database.php.

References Wikimedia\Rdbms\Database\getLastPHPError().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\open(), and Wikimedia\Rdbms\DatabasePostgres\open().

◆ restoreFlags()

Wikimedia\Rdbms\Database::restoreFlags ( $state = self::RESTORE_PRIOR )

Restore the flags to their prior state before the last setFlag/clearFlag call.

Parameters

string $state IDatabase::RESTORE_* constant. [default: RESTORE_PRIOR]

Since: 1.28

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 806 of file Database.php.

Referenced by Wikimedia\Rdbms\LoadBalancer\undoTransactionRoundFlags().

◆ resultObject()

Wikimedia\Rdbms\Database::resultObject ( $result )

protected

Take a query result and wrap it in an iterable result wrapper if necessary.

Booleans are passed through as-is to indicate success/failure of write queries.

Once upon a time, Database::query() returned a bare MySQL result resource, and it was necessary to call this function to convert it to a wrapper. Nowadays, raw database objects are never exposed to external callers, so this is unnecessary in external code.

Parameters

bool | IResultWrapper | resource $result

Returns: bool|IResultWrapper

Definition at line 4798 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\query().

◆ rollback()

Wikimedia\Rdbms\Database::rollback	(	$fname = `__METHOD__`,
		$flush = `self::FLUSHING_ONE`
	)

final

Rollback a transaction previously started using begin()

Only call this from code with outer transcation scope. See https://www.mediawiki.org/wiki/Database_transactions for details. Nesting of transactions is not supported. If a serious unexpected error occurs, throwing an Exception is preferrable, using a pre-installed error handler to trigger rollback (in any case, failure to issue COMMIT will cause rollback server-side).

Query, connection, and onTransaction* callback errors will be suppressed and logged.

Parameters

string	$fname	Calling function name
string	$flush	Flush flag, set to a situationally valid IDatabase::FLUSHING_* constant to disable warnings about calling rollback when no transaction is in progress. This will silently break any ongoing explicit transaction. Only set the flush flag if you are sure that it is safe to ignore these warnings in your context.

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.23 Added $flush parameter

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4624 of file Database.php.

References Wikimedia\Rdbms\Database\assertHasConnectionHandle(), Wikimedia\Rdbms\Database\consumeTrxShortId(), Wikimedia\Rdbms\Database\doRollback(), Wikimedia\Rdbms\Database\getDomainID(), Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\pingAndCalculateLastTrxApplyTime(), Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks(), Wikimedia\Rdbms\Database\runTransactionListenerCallbacks(), Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\trxStatus().

Referenced by Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\close(), Wikimedia\Rdbms\Database\deadlockLoop(), and Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks().

◆ runOnAtomicSectionCancelCallbacks()

Wikimedia\Rdbms\Database::runOnAtomicSectionCancelCallbacks	(		$trigger,
		array	$sectionIds = `null`
	)

private

Actually run any "atomic section cancel" callbacks.

Parameters

int	$trigger	IDatabase::TRIGGER_* constant
AtomicSectionIdentifier[] \| null	$sectionIds	Section IDs to cancel, null on transaction rollback

Definition at line 4189 of file Database.php.

References Wikimedia\Rdbms\Database\$errorLogger, and Wikimedia\Rdbms\Database\$trxSectionCancelCallbacks.

Referenced by Wikimedia\Rdbms\Database\cancelAtomic().

◆ runOnTransactionIdleCallbacks()

Wikimedia\Rdbms\Database::runOnTransactionIdleCallbacks ( $trigger )

Actually consume and run any "on transaction idle/resolution" callbacks.

This method should not be used outside of Database/LoadBalancer

Parameters

int $trigger IDatabase::TRIGGER_* constant

Returns: int Number of callbacks attempted

Since: 1.20

Exceptions

Exception

Definition at line 4085 of file Database.php.

References Wikimedia\Rdbms\Database\clearFlag(), Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\rollback(), Wikimedia\Rdbms\Database\setFlag(), and Wikimedia\Rdbms\Database\trxLevel().

Referenced by Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\handleSessionLossPostconnect(), Wikimedia\Rdbms\Database\onTransactionCommitOrIdle(), and Wikimedia\Rdbms\Database\rollback().

◆ runOnTransactionPreCommitCallbacks()

Wikimedia\Rdbms\Database::runOnTransactionPreCommitCallbacks ( )

Actually consume and run any "on transaction pre-commit" callbacks.

This method should not be used outside of Database/LoadBalancer

Since: 1.22

Returns: int Number of callbacks attempted

Exceptions

Exception

Definition at line 4154 of file Database.php.

References Wikimedia\Rdbms\Database\$errorLogger, and Wikimedia\Rdbms\Database\$trxPreCommitCallbacks.

Referenced by Wikimedia\Rdbms\Database\commit(), and Wikimedia\Rdbms\LoadBalancer\finalizeMasterChanges().

◆ runTransactionListenerCallbacks()

Wikimedia\Rdbms\Database::runTransactionListenerCallbacks ( $trigger )

Actually run any "transaction listener" callbacks.

This method should not be used outside of Database/LoadBalancer

Parameters

int $trigger IDatabase::TRIGGER_* constant

Exceptions

Exception

Since: 1.20

Definition at line 4230 of file Database.php.

References Wikimedia\Rdbms\Database\$errorLogger.

Referenced by Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\handleSessionLossPostconnect(), Wikimedia\Rdbms\Database\rollback(), and Wikimedia\Rdbms\LoadBalancer\runMasterTransactionListenerCallbacks().

◆ select()

Wikimedia\Rdbms\Database::select	(	$table,
		$vars,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Execute a SELECT query constructed using the various parameters provided.

Parameters

string | array $table Table name(s)

May be either an array of table names, or a single string holding a table name. If an array is given, table aliases can be specified, for example:

[ 'a' => 'user' ]

This includes the user table in the query, with the alias "a" available for use in field names (e.g. a.user_name).

A derived table, defined by the result of selectSQLText(), requires an alias key and a Subquery instance value which wraps the SQL query, for example:

[ 'c' => new Subquery( 'SELECT ...' ) ]

Joins using parentheses for grouping (since MediaWiki 1.31) may be constructed using nested arrays. For example,

[ 'tableA', 'nestedB' => [ 'tableB', 'b2' => 'tableB2' ] ]

along with $join_conds like

[ 'b2' => [ 'JOIN', 'b_id = b2_id' ], 'nestedB' => [ 'LEFT JOIN', 'b_a = a_id' ] ]

will produce SQL something like

FROM tableA LEFT JOIN (tableB JOIN tableB2 AS b2 ON (b_id = b2_id)) ON (b_a = a_id)

All of the table names given here are automatically run through Database::tableName(), which causes the table prefix (if any) to be added, and various other table name mappings to be performed.

Do not use untrusted user input as a table name. Alias names should not have characters outside of the Basic multilingual plane.

Parameters

string | array $vars Field name(s)

May be either a field name or an array of field names. The field names can be complete fragments of SQL, for direct inclusion into the SELECT query. If an array is given, field aliases can be specified, for example:

[ 'maxrev' => 'MAX(rev_id)' ]

This includes an expression with the alias "maxrev" in the query.

If an expression is given, care must be taken to ensure that it is DBMS-independent.

Untrusted user input must not be passed to this parameter.

Parameters

string | array $conds

May be either a string containing a single condition, or an array of conditions. If an array is given, the conditions constructed from each element are combined with AND.

Array elements may take one of two forms:

Elements with a numeric key are interpreted as raw SQL fragments.
Elements with a string key are interpreted as equality conditions, where the key is the field name.
- If the value of such an array element is a scalar (such as a string), it will be treated as data and thus quoted appropriately. If it is null, an IS NULL clause will be added.
- If the value is an array, an IN (...) clause will be constructed from its non-null elements, and an IS NULL clause will be added if null is present, such that the field may match any of the elements in the array. The non-null elements will be quoted.

Note that expressions are often DBMS-dependent in their syntax. DBMS-independent wrappers are provided for constructing several types of expression commonly used in condition queries. See:

IDatabase::buildLike()
IDatabase::conditional()

Untrusted user input is safe in the values of string keys, however untrusted input must not be used in the array key names or in the values of numeric keys. Escaping of untrusted input used in values of numeric keys should be done via IDatabase::addQuotes()

Use an empty array, string, or IDatabase::ALL_ROWS to select all rows.

Parameters

string	$fname	Caller function name
string \| array	$options	Query options

Optional: Array of query options. Boolean options are specified by including them in the array as a string value with a numeric key, for example:

[ 'FOR UPDATE' ]

The supported options are:

OFFSET: Skip this many rows at the start of the result set. OFFSET with LIMIT can theoretically be used for paging through a result set, but this is discouraged for performance reasons.
LIMIT: Integer: return at most this many rows. The rows are sorted and then the first rows are taken until the limit is reached. LIMIT is applied to a result set after OFFSET.
LOCK IN SHARE MODE: Boolean: lock the returned rows so that they can't be changed until the next COMMIT. Cannot be used with aggregate functions (COUNT, MAX, etc., but also DISTINCT).
FOR UPDATE: Boolean: lock the returned rows so that they can't be changed nor read with LOCK IN SHARE MODE until the next COMMIT. Cannot be used with aggregate functions (COUNT, MAX, etc., but also DISTINCT).
DISTINCT: Boolean: return only unique result rows.
GROUP BY: May be either an SQL fragment string naming a field or expression to group by, or an array of such SQL fragments.
HAVING: May be either an string containing a HAVING clause or an array of conditions building the HAVING clause. If an array is given, the conditions constructed from each element are combined with AND.
ORDER BY: May be either an SQL fragment giving a field name or expression to order by, or an array of such SQL fragments.
USE INDEX: This may be either a string giving the index name to use for the query, or an array. If it is an associative array, each key gives the table name (or alias), each value gives the index name to use for that table. All strings are SQL fragments and so should be validated by the caller.
IGNORE INDEX: This may be either be a string giving an index name to ignore for the query, or an array. If it is an associative array, each key gives the table name (or alias), each value gives the index name to ignore for that table. All strings are SQL fragments and so should be validated by the caller.
EXPLAIN: In MySQL, this causes an EXPLAIN SELECT query to be run, instead of SELECT.

And also the following boolean MySQL extensions, see the MySQL manual for documentation:

STRAIGHT_JOIN
SQL_BIG_RESULT
SQL_BUFFER_RESULT
SQL_SMALL_RESULT
SQL_CALC_FOUND_ROWS

Parameters

string | array $join_conds Join conditions

Optional associative array of table-specific join conditions. In the most common case, this is unnecessary, since the join condition can be in $conds. However, it is useful for doing a LEFT JOIN.

The key of the array contains the table name or alias. The value is an array with two elements, numbered 0 and 1. The first gives the type of join, the second is the same as the $conds parameter. Thus it can be an SQL fragment, or an array where the string keys are equality and the numeric keys are SQL fragments all AND'd together. For example:

[ 'page' => [ 'LEFT JOIN', 'page_latest=rev_id' ] ]

Returns: IResultWrapper Resulting rows

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1916 of file Database.php.

References Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\selectSQLText().

Referenced by Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\DatabaseMysqlBase\estimateRowCount(), Wikimedia\Rdbms\DatabasePostgres\estimateRowCount(), Wikimedia\Rdbms\Database\estimateRowCount(), Wikimedia\Rdbms\Database\selectField(), Wikimedia\Rdbms\Database\selectFieldValues(), Wikimedia\Rdbms\Database\selectRow(), and Wikimedia\Rdbms\Database\selectRowCount().

◆ selectDB()

Wikimedia\Rdbms\Database::selectDB ( $db )

final

Change the current database.

This should only be called by a load balancer or if the handle is not attached to one

Parameters

string $db

Returns: bool True unless an exception was thrown

Exceptions

DBConnectionError	If databasesAreIndependent() is true and connection change fails
DBError	On query error or if database changes are disallowed

Deprecated:: Since 1.32 Use selectDomain() instead

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2779 of file Database.php.

References Wikimedia\Rdbms\Database\selectDomain().

◆ selectDomain()

Wikimedia\Rdbms\Database::selectDomain ( $domain )

final

Set the current domain (database, schema, and table prefix)

This will throw an error for some database types if the database is unspecified

This should only be called by a load balancer or if the handle is not attached to one

Parameters

string | DatabaseDomain $domain

Exceptions

DBConnectionError	If databasesAreIndependent() is true and connection change fails
DBError	On query error, if domain changes are disallowed, or the domain is invalid

Since: 1.32

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2789 of file Database.php.

References Wikimedia\Rdbms\Database\doSelectDomain(), and Wikimedia\Rdbms\DatabaseDomain\newFromId().

Referenced by Wikimedia\Rdbms\Database\selectDB().

◆ selectField()

Wikimedia\Rdbms\Database::selectField	(	$table,
		$var,
		$cond = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

A SELECT wrapper which returns a single field from a single result row.

If no result rows are returned from the query, false is returned.

Parameters

string \| array	$table	Table name. See IDatabase::select() for details.
string	$var	The field name to select. This must be a valid SQL fragment: do not use unvalidated user input.
string \| array	$cond	The condition array. See IDatabase::select() for details.
string	$fname	The function name of the caller.
string \| array	$options	The query options. See IDatabase::select() for details.
string \| array	$join_conds	The query join conditions. See IDatabase::select() for details.

Returns: mixed The value from the field

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1750 of file Database.php.

References $res, Wikimedia\Rdbms\IDatabase\fetchRow(), Wikimedia\Rdbms\Database\normalizeOptions(), and Wikimedia\Rdbms\Database\select().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\getServerVersion(), Wikimedia\Rdbms\DatabasePostgres\ruleExists(), and Wikimedia\Rdbms\DatabaseMysqlBase\setBigSelects().

◆ selectFieldsOrOptionsAggregate()

Wikimedia\Rdbms\Database::selectFieldsOrOptionsAggregate	(	$fields,
		$options
	)

private

Parameters

array \| string	$fields
array \| string	$options

Returns: bool

Definition at line 2103 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\selectSQLText().

◆ selectFieldValues()

Wikimedia\Rdbms\Database::selectFieldValues	(	$table,
		$var,
		$cond = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

A SELECT wrapper which returns a list of single field values from result rows.

If no result rows are returned from the query, an empty array is returned.

Parameters

string \| array	$table	Table name. See IDatabase::select() for details.
string	$var	The field name to select. This must be a valid SQL fragment: do not use unvalidated user input.
string \| array	$cond	The condition array. See IDatabase::select() for details.
string	$fname	The function name of the caller.
string \| array	$options	The query options. See IDatabase::select() for details.
string \| array	$join_conds	The query join conditions. See IDatabase::select() for details.

Returns: array The values from the field in the order they were returned from the DB

Exceptions

DBError If an error occurs, see IDatabase::query()

Since: 1.25

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 1773 of file Database.php.

References $res, Wikimedia\Rdbms\Database\normalizeOptions(), and Wikimedia\Rdbms\Database\select().

◆ selectOptionsIncludeLocking()

Wikimedia\Rdbms\Database::selectOptionsIncludeLocking ( $options )

private

Parameters

string | array $options

Returns: bool

Definition at line 2087 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\selectSQLText().

◆ selectRow()

Wikimedia\Rdbms\Database::selectRow	(	$table,
		$vars,
		$conds,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Wrapper to IDatabase::select() that only fetches one row (via LIMIT)

If the query returns no rows, false is returned.

This method is convenient for fetching a row based on a unique key condition.

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
array \| string	$join_conds	Join conditions

Returns: stdClass|bool

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2015 of file Database.php.

References $res, Wikimedia\Rdbms\IDatabase\fetchObject(), Wikimedia\Rdbms\IDatabase\numRows(), and Wikimedia\Rdbms\Database\select().

Referenced by Wikimedia\Rdbms\DatabaseMysqlBase\getReplicationSafetyInfo(), Wikimedia\Rdbms\DatabaseSqlite\indexUnique(), and Wikimedia\Rdbms\DatabaseMysqlBase\wasKnownStatementRollbackError().

◆ selectRowCount()

Wikimedia\Rdbms\Database::selectRowCount	(	$tables,
		$var = `' *'`,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Get the number of rows in dataset.

This is useful when trying to do COUNT(*) but with a LIMIT for performance.

Takes the same arguments as IDatabase::select().

Since: 1.27 Added $join_conds parameter

Parameters

string \| string[]	$tables	Table name(s)
string	$var	Column for which NULL values are not counted [default "*"]
array \| string	$conds	Filters on the table
string	$fname	Function name for profiling
array	$options	Options for select
array	$join_conds	Join conditions (since 1.27)

Returns: int Row count

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 2054 of file Database.php.

References $res, Wikimedia\Rdbms\Database\buildSelectSubquery(), Wikimedia\Rdbms\Database\extractSingleFieldFromList(), Wikimedia\Rdbms\IDatabase\fetchRow(), Wikimedia\Rdbms\Database\normalizeConditions(), and Wikimedia\Rdbms\Database\select().

Referenced by Wikimedia\Rdbms\Database\lockForUpdate().

◆ selectSQLText()

Wikimedia\Rdbms\Database::selectSQLText	(	$table,
		$vars,
		$conds = `''`,
		$fname = `__METHOD__`,
		$options = `[]`,
		$join_conds = `[]`
	)

Take the same arguments as IDatabase::select() and return the SQL it would use.This can be useful for making UNION queries, where the SQL text of each query is needed. In general, however, callers outside of Database classes should just use select().

See also: IDatabase::select()

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
string \| array	$conds	Conditions
string	$fname	Caller function name
string \| array	$options	Query options
string \| array	$join_conds	Join conditions

Returns: string SQL query string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 1928 of file Database.php.

References Wikimedia\Rdbms\Database\fieldNamesWithAlias(), Wikimedia\Rdbms\Database\limitResult(), Wikimedia\Rdbms\Database\makeList(), Wikimedia\Rdbms\Database\makeSelectOptions(), Wikimedia\Rdbms\Database\selectFieldsOrOptionsAggregate(), Wikimedia\Rdbms\Database\selectOptionsIncludeLocking(), and Wikimedia\Rdbms\Database\tableNamesWithIndexClauseOrJOIN().

Referenced by Wikimedia\Rdbms\Database\buildGroupConcatField(), Wikimedia\Rdbms\DatabaseSqlite\buildGroupConcatField(), Wikimedia\Rdbms\Database\buildSelectSubquery(), Wikimedia\Rdbms\Database\doInsertSelectNative(), Wikimedia\Rdbms\Database\select(), and Wikimedia\Rdbms\Database\unionConditionPermutations().

◆ serverIsReadOnly()

Wikimedia\Rdbms\Database::serverIsReadOnly ( )

Returns: bool Whether the DB is marked as read-only server-side

Since: 1.28

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3900 of file Database.php.

◆ setBigSelects()

Wikimedia\Rdbms\Database::setBigSelects ( $value = true )

Allow or deny "big selects" for this session only.This is done by setting the sql_big_selects session variable.This is a MySQL-specific feature.

Parameters

bool | string $value True for allow, false for deny, or "default" to restore the initial value

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 5409 of file Database.php.

◆ setFlag()

Wikimedia\Rdbms\Database::setFlag	(	$flag,
		$remember = `self::REMEMBER_NOTHING`
	)

Set a flag for this connection.

Parameters

int	$flag	One of (IDatabase::DBO_DEBUG, IDatabase::DBO_TRX)
string	$remember	IDatabase::REMEMBER_* constant [default: REMEMBER_NOTHING]

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 776 of file Database.php.

Referenced by Wikimedia\Rdbms\LoadBalancer\applyTransactionRoundFlags(), and Wikimedia\Rdbms\Database\runOnTransactionIdleCallbacks().

◆ setIndexAliases()

Wikimedia\Rdbms\Database::setIndexAliases ( array $aliases )

Convert certain index names to alternative names before querying the DB.Note that this applies to indexes regardless of the table they belong to.This can be employed when an index was renamed X => Y in code, but the new Y-named indexes were not yet built on all DBs. After all the Y-named ones are added by the DBA, the aliases can be removed, and then the old X-named indexes dropped.

Parameters

string[] $aliases

Since: 1.31

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5447 of file Database.php.

◆ setLBInfo()

Wikimedia\Rdbms\Database::setLBInfo	(	$nameOrArray,
		$value = `null`
	)

Set the entire array or a particular key of the managing load balancer info array.

Keys matching the IDatabase::LB_* constants are also used internally by subclasses

Parameters

array \| string	$nameOrArray	The new array or the name of a key to set
array \| null	$value	If $nameOrArray is a string, the new key value (null to unset)

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 629 of file Database.php.

Referenced by Wikimedia\Rdbms\LoadBalancer\applyTransactionRoundFlags(), and Wikimedia\Rdbms\LoadBalancer\undoTransactionRoundFlags().

◆ setLogger()

Wikimedia\Rdbms\Database::setLogger ( LoggerInterface $logger )

Set the PSR-3 logger interface to use for query logging.

(The logger interfaces for connection logging and error logging can be set with the constructor.)

Parameters

LoggerInterface $logger

Definition at line 541 of file Database.php.

◆ setSchemaVars()

Wikimedia\Rdbms\Database::setSchemaVars ( $vars )

Set schema variables to be used when streaming commands from SQL files or stdin.

Variables appear as SQL comments and are substituted by their corresponding values

Parameters

array | null $vars Map of (variable => value) or null to use the defaults

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 5033 of file Database.php.

◆ setSessionOptions()

Wikimedia\Rdbms\Database::setSessionOptions ( array $options )

Override database's default behavior.$options include: 'connTimeout' : Set the connection timeout value in seconds. May be useful for very long batch queries such as full-wiki dumps, where a single query reads out over hours or days.

Parameters

array $options

Returns: void

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 4998 of file Database.php.

◆ setTableAliases()

Wikimedia\Rdbms\Database::setTableAliases ( array $aliases )

Make certain table names use their own database, schema, and table prefix when passed into SQL queries pre-escaped and without a qualified database name.For example, "user" can be converted to "myschema.mydbname.user" for convenience. Appearances like user, somedb.user, somedb.someschema.user will used literally.Calling this twice will completely clear any old table aliases. Also, note that callers are responsible for making sure the schemas and databases actually exist.

Parameters

array[] $aliases Map of (table => (dbname, schema, prefix) map)

Since: 1.28

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5439 of file Database.php.

◆ setTransactionListener()

Wikimedia\Rdbms\Database::setTransactionListener	(		$name,
		callable	$callback = `null`
	)

final

Run a callback after each time any transaction commits or rolls back.

The callback takes two arguments:

IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_ROLLBACK
This IDatabase object Callbacks must commit any transactions that they begin.

Registering a callback here will not affect writesOrCallbacks() pending.

Since callbacks from this or onTransactionCommitOrIdle() can start and end transactions, a single call to IDatabase::commit might trigger multiple runs of the listener callbacks.

Parameters

string	$name	Callback name
callable \| null	$callback	Use null to unset a listener

Since: 1.28

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4055 of file Database.php.

◆ setTrxEndCallbackSuppression()

Wikimedia\Rdbms\Database::setTrxEndCallbackSuppression ( $suppress )

final

Whether to disable running of post-COMMIT/ROLLBACK callbacks.

This method should not be used outside of Database/LoadBalancer

Parameters

bool $suppress

Since: 1.28

Definition at line 4071 of file Database.php.

Referenced by Wikimedia\Rdbms\LoadBalancer\finalizeMasterChanges(), and Wikimedia\Rdbms\LoadBalancer\runMasterTransactionIdleCallbacks().

◆ sourceFile()

Wikimedia\Rdbms\Database::sourceFile	(		$filename,
		callable	$lineCallback = `null`,
		callable	$resultCallback = `null`,
			$fname = `false`,
		callable	$inputCallback = `null`
	)

Read and execute SQL commands from a file.

Returns true on success, error string or exception on failure (depending on object's error ignore settings).

Parameters

string	$filename	File name to open
callable \| null	$lineCallback	Optional function called before reading each line
callable \| null	$resultCallback	Optional function called for each MySQL result
bool \| string	$fname	Calling function name or false if name should be generated dynamically using $filename
callable \| null	$inputCallback	Optional function called for each complete line sent

Returns: bool|string

Exceptions

Exception

Definition at line 5001 of file Database.php.

References Wikimedia\Rdbms\Database\sourceStream().

◆ sourceStream()

Wikimedia\Rdbms\Database::sourceStream	(		$fp,
		callable	$lineCallback = `null`,
		callable	$resultCallback = `null`,
			$fname = `__METHOD__`,
		callable	$inputCallback = `null`
	)

Read and execute commands from an open file handle.

Returns true on success, error string or exception on failure (depending on object's error ignore settings).

Parameters

resource	$fp	File handle
callable \| null	$lineCallback	Optional function called before reading each query
callable \| null	$resultCallback	Optional function called for each MySQL result
string	$fname	Calling function name
callable \| null	$inputCallback	Optional function called for each complete query sent

Returns: bool|string

Referenced by Wikimedia\Rdbms\Database\doAtomicSection(), Wikimedia\Rdbms\DatabasePostgres\doInsertNonConflicting(), Wikimedia\Rdbms\Database\doInsertSelectGeneric(), Wikimedia\Rdbms\Database\doReplace(), Wikimedia\Rdbms\DatabaseSqlite\doTruncate(), Wikimedia\Rdbms\Database\doUpsert(), Wikimedia\Rdbms\Database\lockTables(), and Wikimedia\Rdbms\Database\onTransactionPreCommitOrIdle().

Definition at line 5037 of file Database.php.

References Wikimedia\Rdbms\Database\$delimiter, $line, $res, Wikimedia\Rdbms\IDatabase\lastError(), Wikimedia\Rdbms\Database\query(), Wikimedia\Rdbms\Database\replaceVars(), and Wikimedia\Rdbms\Database\streamStatementEnd().

Referenced by Wikimedia\Rdbms\Database\sourceFile().

◆ startAtomic()

Wikimedia\Rdbms\Database::startAtomic	(	$fname = `__METHOD__`,
		$cancelable = `self::ATOMIC_NOT_CANCELABLE`
	)

final

Begin an atomic section of SQL statements.

Start an implicit transaction if no transaction is already active, set a savepoint (if $cancelable is ATOMIC_CANCELABLE), and track the given section name to enforce that the transaction is not committed prematurely. The end of the section must be signified exactly once, either by endAtomic() or cancelAtomic(). Sections can have have layers of inner sections (sub-sections), but all sections must be ended in order of innermost to outermost. Transactions cannot be started or committed until all atomic sections are closed.

ATOMIC_CANCELABLE is useful when the caller needs to handle specific failure cases by discarding the section's writes. This should not be used for failures when:

upsert() could easily be used instead
insert() with IGNORE could easily be used instead
select() with FOR UPDATE could be checked before issuing writes instead
The failure is from code that runs after the first write but doesn't need to
The failures are from contention solvable via onTransactionPreCommitOrIdle()
The failures are deadlocks; the RDBMs usually discard the whole transaction

Note: callers must use additional measures for situations involving two or more (peer) transactions (e.g. updating two database servers at once). The transaction and savepoint logic of this method only applies to this specific IDatabase instance.

Example usage:

// Start a transaction if there isn't one already
$dbw->startAtomic( __METHOD__ );
// Serialize these thread table updates
$dbw->select( 'thread', '1', [ 'td_id' => $tid ], __METHOD__, 'FOR UPDATE' );
// Add a new comment for the thread
$dbw->insert( 'comment', $row, __METHOD__ );
$cid = $db->insertId();
// Update thread reference to last comment
$dbw->update( 'thread', [ 'td_latest' => $cid ], [ 'td_id' => $tid ], __METHOD__ );
// Demark the end of this conceptual unit of updates
$dbw->endAtomic( __METHOD__ );

Example usage (atomic changes that might have to be discarded):

// Start a transaction if there isn't one already
$sectionId = $dbw->startAtomic( __METHOD__, $dbw::ATOMIC_CANCELABLE );
// Create new record metadata row
$dbw->insert( 'records', $row, __METHOD__ );
// Figure out where to store the data based on the new row's ID
$path = $recordDirectory . '/' . $dbw->insertId();
// Write the record data to the storage system
$status = $fileBackend->create( [ 'dst' => $path, 'content' => $data ] );
if ( $status->isOK() ) {
    // Try to cleanup files orphaned by transaction rollback
    $dbw->onTransactionResolution(
        function ( $type ) use ( $fileBackend, $path ) {
            if ( $type === IDatabase::TRIGGER_ROLLBACK ) {
                $fileBackend->delete( [ 'src' => $path ] );
            }
        },
        __METHOD__
    );
    // Demark the end of this conceptual unit of updates
    $dbw->endAtomic( __METHOD__ );
} else {
    // Discard these writes from the transaction (preserving prior writes)
    $dbw->cancelAtomic( __METHOD__, $sectionId );
}

Since: 1.23

Parameters

string	$fname
string	$cancelable	Pass self::ATOMIC_CANCELABLE to use a savepoint and enable self::cancelAtomic() for this section.

Returns: AtomicSectionIdentifier section ID token

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4319 of file Database.php.

References Wikimedia\Rdbms\Database\$NOT_APPLICABLE, Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\doSavepoint(), Wikimedia\Rdbms\Database\getFlag(), Wikimedia\Rdbms\Database\nextSavepointId(), and Wikimedia\Rdbms\Database\trxLevel().

◆ streamStatementEnd()

Wikimedia\Rdbms\Database::streamStatementEnd	(	&	$sql,
		&	$newLine
	)

Called by sourceStream() to check if we've reached a statement end.

Stable to override

Parameters

string	&$sql	SQL assembled so far
string	&$newLine	New line about to be added to $sql

Returns: bool Whether $newLine contains end of the statement

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabasePostgres.

Definition at line 5115 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\sourceStream().

◆ strencode()

Wikimedia\Rdbms\Database::strencode ( $s )

abstract

Wrapper for addslashes()

Stable to override

Parameters

string $s String to be slashed.

Returns: string Slashed string.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\addQuotes().

◆ strreplace()

Wikimedia\Rdbms\Database::strreplace	(	$orig,
		$old,
		$new
	)

Returns a SQL expression for simple string replacement (e.g.REPLACE() in mysql)

Parameters

string	$orig	Column to modify
string	$old	Column to seek
string	$new	Column to replace with

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3756 of file Database.php.

◆ tableExists()

Wikimedia\Rdbms\Database::tableExists	(	$table,
		$fname = `__METHOD__`
	)

abstract

Query whether a given table exists.

Parameters

string	$table
string	$fname

Returns: bool

Exceptions

DBError If an error occurs, see IDatabase::query()

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DatabaseSqlite.

Referenced by Wikimedia\Rdbms\Database\dropTable(), and Wikimedia\Rdbms\Database\indexExists().

◆ tableLocksHaveTransactionScope()

Wikimedia\Rdbms\Database::tableLocksHaveTransactionScope ( )

Checks if table locks acquired by lockTables() are transaction-bound in their scope.

Transaction-bound table locks will be released when the current transaction terminates. Table locks that are not bound to a transaction are not effected by BEGIN/COMMIT/ROLLBACK and will last until either lockTables()/unlockTables() is called or the TCP connection to the database is closed.

Returns: bool

Since: 1.29

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase.

Definition at line 5279 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\lockTables(), and Wikimedia\Rdbms\Database\unlockTables().

◆ tableName()

Wikimedia\Rdbms\Database::tableName	(	$name,
		$format = `'quoted'`
	)

Format a table name ready for use in constructing an SQL query.This does two important things: it quotes the table names to clean them up, and it adds a table prefix if only given a table name with no quotes.All functions of this object which require a table name call this function themselves. Pass the canonical name to such functions. This is only needed when calling query() directly.

Note: This function does not sanitize user input. It is not safe to use this function to escape user input.

Parameters

string	$name	Database table name
string	$format	One of: quoted - Automatically pass the table name through addIdentifierQuotes() so that it can be used in a query. raw - Do not add identifier quotes to the table name

Returns: string Full database name

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 2816 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), Wikimedia\Rdbms\Database\isQuotedIdentifier(), Wikimedia\Rdbms\Database\prependDatabaseOrSchema(), and Wikimedia\Rdbms\Database\qualifiedTableComponents().

◆ tableNames()

Wikimedia\Rdbms\Database::tableNames ( $tables )

Fetch a number of table names into an array This is handy when you need to construct SQL for joins.

Example: list( $user, $watchlist ) = $dbr->tableNames( 'user', 'watchlist' ) ); $sql = "SELECT wl_namespace, wl_title FROM $watchlist, $user WHERE wl_user=user_id AND wl_user=$nameWithQuotes";

Parameters

string ...$tables

Returns: array

Definition at line 2925 of file Database.php.

References Wikimedia\Rdbms\Database\tableName().

◆ tableNamesN()

Wikimedia\Rdbms\Database::tableNamesN ( $tables )

Fetch a number of table names into an zero-indexed numerical array This is handy when you need to construct SQL for joins.

Example: list( $user, $watchlist ) = $dbr->tableNamesN( 'user', 'watchlist' ); $sql = "SELECT wl_namespace,wl_title FROM $watchlist,$user WHERE wl_user=user_id AND wl_user=$nameWithQuotes";

Parameters

string ...$tables

Returns: array

References Wikimedia\Rdbms\Database\ignoreIndexClause(), Wikimedia\Rdbms\Database\makeList(), Wikimedia\Rdbms\Database\tableNamesWithIndexClauseOrJOIN(), Wikimedia\Rdbms\Database\tableNameWithAlias(), and Wikimedia\Rdbms\Database\useIndexClause().

Definition at line 2935 of file Database.php.

References Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\DatabasePostgres\doTruncate().

◆ tableNamesWithIndexClauseOrJOIN()

Wikimedia\Rdbms\Database::tableNamesWithIndexClauseOrJOIN	(	$tables,
		$use_index = `[]`,
		$ignore_index = `[]`,
		$join_conds = `[]`
	)

protected

Get the aliased table name clause for a FROM clause which might have a JOIN and/or USE INDEX or IGNORE INDEX clause.

Parameters

array	$tables	( [alias] => table )
array	$use_index	Same as for select()
array	$ignore_index	Same as for select()
array	$join_conds	Same as for select()

Returns: string

Definition at line 3021 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\selectSQLText(), and Wikimedia\Rdbms\Database\tableNamesWithIndexClauseOrJOIN().

◆ tableNameWithAlias()

Wikimedia\Rdbms\Database::tableNameWithAlias	(	$table,
		$alias = `false`
	)

protected

Get an aliased table name.

This returns strings like "tableName AS newTableName" for aliased tables and "(SELECT * from tableA) newTablename" for subqueries (e.g. derived tables)

See also: Database::tableName()

Parameters

string \| Subquery	$table	Table name or object with a 'sql' field
string \| bool	$alias	Table alias (optional)

Returns: string SQL name for aliased table. Will not alias a table to its own name

Definition at line 2956 of file Database.php.

References Wikimedia\Rdbms\Database\addIdentifierQuotes(), and Wikimedia\Rdbms\Database\tableName().

Referenced by Wikimedia\Rdbms\Database\tableNamesWithIndexClauseOrJOIN().

◆ tablePrefix()

Wikimedia\Rdbms\Database::tablePrefix ( $prefix = null )

Get/set the table prefix.

Parameters

string | null $prefix The table prefix to set, or omitted to leave it unchanged

Returns: string The previous table prefix

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 573 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\qualifiedTableComponents().

◆ textFieldSize()

Wikimedia\Rdbms\Database::textFieldSize	(	$table,
		$field
	)

Returns the size of a text field, or -1 for "unlimited".

Parameters

string	$table
string	$field

Returns: int

Stable to override

Reimplemented in Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3435 of file Database.php.

References $res, Wikimedia\Rdbms\IDatabase\fetchObject(), Wikimedia\Rdbms\Database\query(), and Wikimedia\Rdbms\Database\tableName().

◆ timestamp()

Wikimedia\Rdbms\Database::timestamp ( $ts = 0 )

Convert a timestamp in one of the formats accepted by ConvertibleTimestamp to the format used for inserting into timestamp fields in this DBMS.The result is unquoted, and needs to be passed through addQuotes() before it can be included in raw SQL.

Parameters

string | int $ts

Returns: string

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabasePostgres.

Definition at line 4761 of file Database.php.

References $t.

Referenced by Wikimedia\Rdbms\Database\encodeExpiry(), and Wikimedia\Rdbms\Database\timestampOrNull().

◆ timestampOrNull()

Wikimedia\Rdbms\Database::timestampOrNull ( $ts = null )

Convert a timestamp in one of the formats accepted by ConvertibleTimestamp to the format used for inserting into timestamp fields in this DBMS.

If NULL is input, it is passed through, allowing NULL values to be inserted into timestamp fields.

The result is unquoted, and needs to be passed through addQuotes() before it can be included in raw SQL.

Parameters

string | int | null $ts

Returns: string|null

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 4767 of file Database.php.

References Wikimedia\Rdbms\Database\timestamp().

◆ truncate()

Wikimedia\Rdbms\Database::truncate	(	$tables,
		$fname = `__METHOD__`
	)

Delete all data in a table(s) and reset any sequences owned by that table(s)

Parameters

string \| string[]	$tables
string	$fname

Exceptions

DBError If an error occurs

Since: 1.35

Definition at line 5353 of file Database.php.

References Wikimedia\Rdbms\Database\doTruncate(), and Wikimedia\Rdbms\Database\isPristineTemporaryTable().

◆ trxLevel()

Wikimedia\Rdbms\Database::trxLevel ( )

final

Gets the current transaction level.

Historically, transactions were allowed to be "nested". This is no longer supported, so this function really only returns a boolean.

Returns: int The previous value

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 557 of file Database.php.

◆ trxStatus()

Wikimedia\Rdbms\Database::trxStatus ( )

Returns: int One of the STATUS_TRX_* class constants

Since: 1.31

Definition at line 569 of file Database.php.

References Wikimedia\Rdbms\Database\$trxStatus.

Referenced by Wikimedia\Rdbms\Database\assertQueryIsCurrentlyAllowed(), Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\cancelAtomic(), Wikimedia\Rdbms\Database\commit(), Wikimedia\Rdbms\Database\executeQuery(), and Wikimedia\Rdbms\Database\rollback().

◆ trxTimestamp()

Wikimedia\Rdbms\Database::trxTimestamp ( )

Get the UNIX timestamp of the time that the transaction was established.

This can be used to reason about the staleness of SELECT data in REPEATABLE-READ transaction isolation level. Callers can assume that if a view-snapshot isolation is used, then the data read by SQL queries is at least up to date to that point (possibly more up-to-date since the first SELECT defines the snapshot).

Returns: float|null Returns null if there is not active transaction

Since: 1.25

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 561 of file Database.php.

References Wikimedia\Rdbms\Database\trxLevel(), and Wikimedia\Rdbms\Database\trxTimestamp().

Referenced by Wikimedia\Rdbms\Database\begin(), Wikimedia\Rdbms\Database\getRecordedTransactionLagStatus(), and Wikimedia\Rdbms\Database\trxTimestamp().

◆ unionConditionPermutations()

Wikimedia\Rdbms\Database::unionConditionPermutations	(		$table,
			$vars,
		array	$permute_conds,
			$extra_conds = `''`,
			$fname = `__METHOD__`,
			$options = `[]`,
			$join_conds = `[]`
	)

Construct a UNION query for permutations of conditions.

Databases sometimes have trouble with queries that have multiple values for multiple condition parameters combined with limits and ordering. This method constructs queries for the Cartesian product of the conditions and unions them all together.

See also: IDatabase::select()

Parameters

string \| array	$table	Table name
string \| array	$vars	Field names
array	$permute_conds	Conditions for the Cartesian product. Keys are field names, values are arrays of the possible values for that field.
string \| array	$extra_conds	Additional conditions to include in the query.
string	$fname	Caller function name
string \| array	$options	Query options. In addition to the options recognized by IDatabase::select(), the following may be used: NOTALL: Set to use UNION instead of UNION ALL. INNER ORDER BY: If specified and supported, subqueries will use this instead of ORDER BY.
string \| array	$join_conds	Join conditions

Returns: string SQL query string.

Since: 1.30

Implements Wikimedia\Rdbms\IDatabase.

Definition at line 3669 of file Database.php.

References Wikimedia\Rdbms\Database\limitResult(), Wikimedia\Rdbms\Database\makeOrderBy(), Wikimedia\Rdbms\Database\selectSQLText(), Wikimedia\Rdbms\Database\unionQueries(), and Wikimedia\Rdbms\Database\unionSupportsOrderAndLimit().

◆ unionQueries()

Wikimedia\Rdbms\Database::unionQueries	(	$sqls,
		$all
	)

Construct a UNION query.This is used for providing overload point for other DB abstractions not compatible with the MySQL syntax.

Parameters

array	$sqls	SQL statements to combine
bool	$all	Either IDatabase::UNION_ALL or IDatabase::UNION_DISTINCT

Returns: string SQL fragment

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3663 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\unionConditionPermutations().

◆ unionSupportsOrderAndLimit()

Wikimedia\Rdbms\Database::unionSupportsOrderAndLimit ( )

Determine if the RDBMS supports ORDER BY and LIMIT for separate subqueries within UNION.

Returns: bool

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 3655 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\unionConditionPermutations().

◆ unlock()

Wikimedia\Rdbms\Database::unlock	(	$lockName,
		$method
	)

Release a lock.Named locks are not related to transactions

Parameters

string	$lockName	Name of lock to release
string	$method	Name of the calling method

Returns: bool Success

Exceptions

DBError If an error occurs, see IDatabase::query()

Stable to override

Implements Wikimedia\Rdbms\IDatabase.

Reimplemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DatabaseSqlite.

Definition at line 5229 of file Database.php.

Referenced by Wikimedia\Rdbms\Database\getScopedLockAndFlush().

◆ unlockTables()

Wikimedia\Rdbms\Database::unlockTables ( $method )

final

Unlock all tables locked via lockTables()

If table locks are scoped to transactions, then locks might not be released until the transaction ends, which could happen after this method is called.

Parameters

string $method The caller

Returns: bool

Since: 1.29