Basic database interface for live and lazy-loaded relation database handles. More...

Inheritance diagram for Wikimedia\Rdbms\IDatabase:

[legend]

Public Member Functions
	__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.

	addIdentifierQuotes ( $s)
	Escape a SQL identifier (e.g.

	addQuotes ( $s)
	Escape and quote a raw value string for use in a SQL query.

	affectedRows ()
	Get the number of rows affected by the last write query.

	aggregateValue ( $valuedata, $valuename='value')
	Return aggregated value alias.

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

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

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

	begin ( $fname=__METHOD__, $mode=self::TRANSACTION_EXPLICIT)
	Begin a transaction.

	bitAnd ( $fieldLeft, $fieldRight)

	bitNot ( $field)

	bitOr ( $fieldLeft, $fieldRight)

	buildConcat ( $stringList)
	Build a concatenation list to feed into a SQL query.

	buildGreatest ( $fields, $values)
	Build a GREATEST function statement comparing columns/values.

	buildGroupConcatField ( $delim, $table, $field, $conds='', $join_conds=[])
	Build a GROUP_CONCAT or equivalent statement for a query.

	buildIntegerCast ( $field)

	buildLeast ( $fields, $values)
	Build a LEAST function statement comparing columns/values.

	buildLike ( $param,... $params)
	LIKE statement wrapper.

	buildSelectSubquery ( $table, $vars, $conds='', $fname=__METHOD__, $options=[], $join_conds=[])
	Equivalent to IDatabase::selectSQLText() except wraps the result in Subquery.

	buildStringCast ( $field)

	buildSubString ( $input, $startPosition, $length=null)
	Build a SUBSTRING function.

	cancelAtomic ( $fname=__METHOD__, AtomicSectionIdentifier $sectionId=null)
	Cancel an atomic section of SQL statements.

	clearFlag ( $flag, $remember=self::REMEMBER_NOTHING)
	Clear a flag for this connection.

	close ( $fname=__METHOD__, $owner=null)
	Close the database connection.

	commit ( $fname=__METHOD__, $flush=self::FLUSHING_ONE)
	Commits a transaction previously started using begin()

	conditional ( $cond, $caseTrueExpression, $caseFalseExpression)
	Returns an SQL expression for a simple conditional.

	databasesAreIndependent ()
	Returns true if DBs are assumed to be on potentially different servers.

	dataSeek (IResultWrapper $res, $row)
	Change the position of the cursor in a result object.

	dbSchema ( $schema=null)
	Get/set the db schema.

	decodeBlob ( $b)
	Some DBMSs return a special placeholder object representing blob fields in result objects.

	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.

	doAtomicSection ( $fname, callable $callback, $cancelable=self::ATOMIC_NOT_CANCELABLE)
	Perform an atomic section of reversable SQL statements from a callback.

	encodeBlob ( $b)
	Some DBMSs have a special format for inserting into blob fields, they don't allow simple quoted strings to be inserted.

	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.

	explicitTrxActive ()

	fetchObject (IResultWrapper $res)
	Fetch the next row from the given result object, in object form.

	fetchRow (IResultWrapper $res)
	Fetch the next row from the given result object, in associative array form.

	fieldExists ( $table, $field, $fname=__METHOD__)
	Determines whether a field exists in a table.

	fieldName (IResultWrapper $res, $n)
	Get a field name in a result object.

	flushSnapshot ( $fname=__METHOD__, $flush=self::FLUSHING_ONE)
	Commit any transaction but error out if writes or callbacks are pending.

	freeResult (IResultWrapper $res)
	Free a result object returned by query() or select()

	getDBname ()
	Get the current database name; null if there isn't one.

	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.

	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 ()

	getPrimaryPos ()
	Get the position of this primary DB.

	getReplicaPos ()
	Get the replication position of this replica DB.

	getScopedLockAndFlush ( $lockKey, $fname, $timeout)
	Acquire a named lock, flush any transaction, and return an RAII style unlocker object.

	getServer ()
	Get the hostname or IP address of the server.

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

	getServerName ()
	Get the readable name for the server.

	getServerUptime ()
	Determines how long the server has been up.

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

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

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

	getTopologyBasedServerId ()
	Get a non-recycled ID that uniquely identifies this server within the replication topology.

	getTopologyRole ()
	Get the replication topology role of this server.

	getTopologyRootMaster ()

	getTopologyRootPrimary ()
	Get the readable name of the sole root primary DB server for the replication topology.

	getType ()
	Get the RDBMS type of the server (e.g.

	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.

	indexExists ( $table, $index, $fname=__METHOD__)
	Determines whether an index exists.

	insert ( $table, $rows, $fname=__METHOD__, $options=[])
	Insert the given row(s) into a table.

	insertId ()
	Get the inserted value of an auto-increment row.

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

	isOpen ()

	isReadOnly ()

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

	lastErrno ()
	Get the last error number.

	lastError ()
	Get a description of the last error.

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

	limitResult ( $sql, $limit, $offset=false)
	Construct a LIMIT query with optional offset.

	lock ( $lockName, $method, $timeout=5, $flags=0)
	Acquire a named lock.

	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)

	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 (DBPrimaryPos $pos, $timeout)

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

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

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

	nextSequenceValue ( $seqName)
	Deprecated method, calls should be removed.

	numFields (IResultWrapper $res)
	Get the number of fields in a result object.

	numRows ( $res)
	Get the number of rows in a query result.

	onAtomicSectionCancel (callable $callback, $fname=__METHOD__)
	Run a callback when the atomic section is cancelled.

	onTransactionCommitOrIdle (callable $callback, $fname=__METHOD__)
	Run a callback when the current transaction commits or now if there is none.

	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 when the current transaction commits or rolls back.

	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 ()

	primaryPosWait (DBPrimaryPos $pos, $timeout)
	Wait for the replica DB to catch up to a given primary DB position.

	query ( $sql, $fname=__METHOD__, $flags=0)
	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.

	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()

	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.

	serverIsReadOnly ()

	setBigSelects ( $value=true)
	Allow or deny "big selects" for this session only.

	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.

	setLBInfo ( $nameOrArray, $value=null)
	Set the entire array or a particular key of the managing load balancer info array.

	setSchemaVars ( $vars)
	Set schema variables to be used when streaming commands from SQL files or stdin.

	setSessionOptions (array $options)
	Override database's default behavior.

	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.

	setTransactionListener ( $name, callable $callback=null)
	Run a callback after each time any transaction commits or rolls back.

	startAtomic ( $fname=__METHOD__, $cancelable=self::ATOMIC_NOT_CANCELABLE)
	Begin an atomic section of SQL statements.

	strreplace ( $orig, $old, $new)
	Returns a SQL expression for simple string replacement (e.g.

	tableExists ( $table, $fname=__METHOD__)
	Query whether a given table exists.

	tablePrefix ( $prefix=null)
	Get/set the table prefix.

	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.

	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.

	trxLevel ()
	Gets the current transaction level.

	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.

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

	unlock ( $lockName, $method)
	Release a lock.

	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.

	wasConnectionLoss ()
	Determines if the last query error was due to a dropped connection.

	wasDeadlock ()
	Determines if the last failure was due to a deadlock.

	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.

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

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

	writesPending ()

Public Attributes
const	LOCK_TIMESTAMP = 1
	Flag to return the lock acquision timestamp (null if not acquired)

Detailed Description

Basic database interface for live and lazy-loaded relation database handles.

Note: IDatabase and DBConnRef should be updated to reflect any changes

Definition at line 38 of file IDatabase.php.

Member Function Documentation

◆ __toString()

Wikimedia\Rdbms\IDatabase::__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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ addIdentifierQuotes()

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

Escape a SQL identifier (e.g.

table, column, database) for use in a SQL query

Depending on the database this will either be backticks or "double quotes"

Parameters

string $s

Returns: string

Since: 1.33

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

Referenced by SiteStatsUpdate\doUpdate(), and SqlBagOStuff\initSqliteDatabase().

◆ addQuotes()

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

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

Parameters

Returns: string

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\addCasTokenFields(), SqlBagOStuff\buildExistenceConditions(), SqlBagOStuff\buildIncrUpsertSet(), PopulateRecentChangesSource\buildUpdateCondition(), SqlBagOStuff\buildUpsertSetForOverwrite(), SqlBagOStuff\deleteServerObjectsExpiringBefore(), RefreshImageMetadata\execute(), RefreshImageMetadata\getConditions(), WatchedItemQueryService\getFromUntilTargetConds(), WatchedItemQueryService\getStartEndConds(), WatchedItemQueryService\getStartFromConds(), WANCacheReapUpdate\getTitleChangeEvents(), WatchedItemQueryService\getUserRelatedConds(), WatchedItemStore\getVisitingWatchersCondition(), WatchedItemQueryService\getWatchedItemsWithRCInfoQueryConds(), Title\invalidateCache(), PurgeJobUtils\invalidatePages(), WatchedItemStore\modifyForExpiry(), UppercaseTitlesForUnicodeTransition\processTable(), DeleteLocalPasswords\processUsers(), UppercaseTitlesForUnicodeTransition\processUsers(), MediaWiki\Block\DatabaseBlockStore\purgeExpiredBlocks(), Title\purgeExpiredRestrictions(), MediaWiki\Page\RollbackPage\updateRecentChange(), and MediaWiki\Revision\RevisionStore\userWasLastToEdit().

◆ affectedRows()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MigrateActors\addActorsForRows(), User\addToDatabase(), SqlBagOStuff\deleteServerObjectsExpiringBefore(), User\insertNewUser(), MigrateComments\loadCommentIDs(), SqlBagOStuff\modifyTableSpecificBlobsForChangeTTL(), SqlBagOStuff\modifyTableSpecificBlobsForIncrInit(), DeduplicateArchiveRevId\processArRevIds(), DeleteLocalPasswords\processUsers(), PopulateArchiveRevId\reassignArRevIds(), and User\saveSettings().

◆ aggregateValue()

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

Return aggregated value alias.

Parameters

array	$valuedata
string	$valuename

Returns: array|string

Deprecated:: Since 1.33

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

◆ anyChar()

Wikimedia\Rdbms\IDatabase::anyChar ( )

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

Returns: LikeMatch

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ anyString()

Wikimedia\Rdbms\IDatabase::anyString ( )

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

Returns: LikeMatch

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by RefreshImageMetadata\getConditions(), UppercaseTitlesForUnicodeTransition\getLikeBatches(), and DeleteLocalPasswords\processUsers().

◆ assertNoOpenTransactions()

Wikimedia\Rdbms\IDatabase::assertNoOpenTransactions ( )

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

Exceptions

DBTransactionError

Since: 1.32

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ begin()

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

Begin a transaction.

Only call this from code with outer transaction 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 also: query}

Implemented in Wikimedia\Rdbms\DBConnRef, and Wikimedia\Rdbms\Database.

Referenced by Maintenance\beginTransaction(), and PopulateArchiveRevId\makeDummyRevisionRow().

◆ bitAnd()

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

Parameters

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

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by RevisionDeleteUser\buildSetBitDeletedField(), WatchedItemQueryService\getExtraDeletedPageLogEntryRelatedCond(), and WatchedItemQueryService\getUserRelatedConds().

◆ bitNot()

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

Parameters

string | int $field

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ bitOr()

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

Parameters

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

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by RevisionDeleteUser\buildSetBitDeletedField().

◆ buildConcat()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\addCasTokenFields(), and DeleteLocalPasswords\processUsers().

◆ buildGreatest()

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

Build a GREATEST 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.

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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SiteStatsUpdate\doUpdate().

◆ buildGroupConcatField()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ buildIntegerCast()

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

Parameters

string $field Field or column to cast

Returns: string

Since: 1.31

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\buildIncrUpsertSet().

◆ buildLeast()

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

Build a LEAST 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.

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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ buildLike()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by RefreshImageMetadata\getConditions(), UppercaseTitlesForUnicodeTransition\getLikeBatches(), and DeleteLocalPasswords\processUsers().

◆ buildSelectSubquery()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ buildStringCast()

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

Parameters

string $field Field or column to cast

Returns: string

Since: 1.28

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ buildSubString()

Wikimedia\Rdbms\IDatabase::buildSubString	(	$input,
		$startPosition,
		$length = `null`
	)

Build a SUBSTRING function.

Behavior for non-ASCII values is undefined.

Parameters

string	$input	Field name
int	$startPosition	Positive integer
int \| null	$length	Non-negative integer length or null for no limit

Exceptions

InvalidArgumentException

Returns: string SQL text

Since: 1.31

Referenced by DeleteLocalPasswords\processUsers().

◆ cancelAtomic()

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

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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ clearFlag()

Wikimedia\Rdbms\IDatabase::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]

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\enforceConnectionFlags(), and JobQueueDB\getScopedNoTrxFlag().

◆ close()

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

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\closeAll(), and Wikimedia\Rdbms\LoadBalancer\closeConnection().

◆ commit()

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

Commits a transaction previously started using begin()

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

Only call this from code with outer transaction 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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\commitPrimaryChanges(), and Maintenance\commitTransaction().

◆ conditional()

Wikimedia\Rdbms\IDatabase::conditional	(	$cond,
		$caseTrueExpression,
		$caseFalseExpression
	)

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 condition expression (yields a boolean)
string	$caseTrueExpression	SQL expression to return when the condition is true
string	$caseFalseExpression	SQL expression to return when the condition is false

Returns: string SQL fragment

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\buildIncrUpsertSet(), SqlBagOStuff\buildUpsertSetForOverwrite(), and WatchedItemStore\getWatchedItemsForUser().

◆ databasesAreIndependent()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ dataSeek()

Wikimedia\Rdbms\IDatabase::dataSeek	(	IResultWrapper	$res,
			$row
	)

Change the position of the cursor in a result object.

See also: https://www.php.net/mysql_data_seek

Deprecated:: since 1.37 use IResultWrapper::seek()

Parameters

IResultWrapper	$res	A SQL result
int	$row

Implemented in Wikimedia\Rdbms\Database.

◆ dbSchema()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ decodeBlob()

Wikimedia\Rdbms\IDatabase::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

DBError

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\dbDecodeSerialValue(), and LocalFile\loadMetadataFromDbFieldValue().

◆ decodeExpiry()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ delete()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by PopulateArchiveRevId\checkMysqlAutoIncrementBug(), SqlBagOStuff\deleteServerObjectsExpiringBefore(), LCStoreDB\finishWrite(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), SqlBagOStuff\modifyTableSpecificBlobsForDelete(), DeduplicateArchiveRevId\processArRevIds(), MediaWiki\Block\DatabaseBlockStore\purgeExpiredBlocks(), Title\purgeExpiredRestrictions(), PopulateArchiveRevId\reassignArRevIds(), and QueryPage\recache().

◆ deleteJoin()

Wikimedia\Rdbms\IDatabase::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-selects

For 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 also: query}

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ doAtomicSection()

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

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 Result of the callback (since 1.28)

Exceptions

DBError If an error occurs, {

See also: query}

Exceptions

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.

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by PopulateArchiveRevId\checkMysqlAutoIncrementBug(), MediaWiki\Revision\RevisionStore\insertRevisionOn(), PopulateArchiveRevId\reassignArRevIds(), and MediaWiki\Storage\NameTableStore\retryStore().

◆ encodeBlob()

Wikimedia\Rdbms\IDatabase::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

DBError

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\dbEncodeSerialValue(), LocalFile\getMetadataForDb(), and LCStoreDB\set().

◆ encodeExpiry()

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

Encode an expiry time into the DBMS dependent format.

Parameters

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

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ endAtomic()

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

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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by JobQueueDB\doBatchPushInternal(), LCStoreDB\finishWrite(), SqlBagOStuff\initSqliteDatabase(), and SqlBagOStuff\modifyTableSpecificBlobsForIncrInit().

◆ estimateRowCount()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ explicitTrxActive()

Wikimedia\Rdbms\IDatabase::explicitTrxActive ( )

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

Since: 1.28

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by DeferredUpdates\areDatabaseTransactionsActive().

◆ fetchObject()

Wikimedia\Rdbms\IDatabase::fetchObject ( IResultWrapper $res )

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

Fields can be retrieved with $row->fieldname, with fields acting like member variables. If no more rows are available, false is returned.

Deprecated:: since 1.37 use IResultWrapper::fetchObject()

Parameters

IResultWrapper $res Object as returned from IDatabase::query(), etc.

Returns: stdClass|bool

Implemented in Wikimedia\Rdbms\Database.

◆ fetchRow()

Wikimedia\Rdbms\IDatabase::fetchRow ( IResultWrapper $res )

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

Fields are retrieved with $row['fieldname']. If no more rows are available, false is returned.

Deprecated:: since 1.37 use IResultWrapper::fetchRow()

Parameters

IResultWrapper $res Result object as returned from IDatabase::query(), etc.

Returns: array|bool

Implemented in Wikimedia\Rdbms\Database.

◆ fieldExists()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ fieldName()

Wikimedia\Rdbms\IDatabase::fieldName	(	IResultWrapper	$res,
			$n
	)

Get a field name in a result object.

See also: https://www.php.net/mysql_field_name

Deprecated:: since 1.37

Parameters

IResultWrapper	$res	A SQL result
int	$n

Returns: string

Implemented in Wikimedia\Rdbms\Database.

◆ flushSnapshot()

Wikimedia\Rdbms\IDatabase::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 primary DB.

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 also: query}

Since: 1.28; 1.34 Added $flush parameter

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\flushPrimarySnapshots(), and Wikimedia\Rdbms\LoadBalancer\flushReplicaSnapshots().

◆ freeResult()

Wikimedia\Rdbms\IDatabase::freeResult ( IResultWrapper $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.

Deprecated:: since 1.37 Use IResultWrapper::free()

Parameters

IResultWrapper $res A SQL result

Implemented in Wikimedia\Rdbms\Database.

◆ getDBname()

Wikimedia\Rdbms\IDatabase::getDBname ( )

Get the current database name; null if there isn't one.

Returns: string|null

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ getDomainID()

Wikimedia\Rdbms\IDatabase::getDomainID ( )

Return the currently selected domain ID.

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

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Block\DatabaseBlockStore\checkDatabaseDomain(), MediaWiki\Revision\RevisionStore\checkDatabaseDomain(), MediaWiki\User\ActorStore\checkDatabaseDomain(), Wikimedia\Rdbms\LoadBalancer\closeConnection(), Wikimedia\Rdbms\LoadBalancer\getConnLogContext(), ActorMigrationBase\getInsertValues(), ActorMigrationBase\getInsertValuesWithTempTable(), MediaWiki\Revision\RevisionStore\getRevisionRowCacheKey(), ActorMigrationBase\getWhere(), Title\invalidateCache(), Wikimedia\Rdbms\LBFactorySingle\newFromConnection(), Wikimedia\Rdbms\LoadBalancerSingle\newFromConnection(), ResourceLoaderWikiModule\preloadTitleInfo(), and Wikimedia\Rdbms\LoadBalancer\reuseConnection().

◆ getFlag()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by JobQueueDB\getScopedNoTrxFlag().

◆ getInfinity()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getLag()

Wikimedia\Rdbms\IDatabase::getLag ( )

Get the amount of replication lag for this database server.

Callers should avoid using this method while a transaction is active

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

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ getLBInfo()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\closeConnection(), Wikimedia\Rdbms\LoadBalancer\reuseConnection(), Wikimedia\Rdbms\LoadBalancer\setLocalDomainPrefix(), and Wikimedia\Rdbms\LoadBalancer\waitForPrimaryPos().

◆ getMasterPos()

Wikimedia\Rdbms\IDatabase::getMasterPos ( )

Deprecated:: since 1.37; use getPrimaryPos() instead.

Returns: DBPrimaryPos|bool False if this is not a primary DB

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ getPrimaryPos()

Wikimedia\Rdbms\IDatabase::getPrimaryPos ( )

Get the position of this primary DB.

Returns: DBPrimaryPos|bool False if this is not a primary DB

Exceptions

DBError If an error occurs, {

See also: query}

Since: 1.37

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ getReplicaPos()

Wikimedia\Rdbms\IDatabase::getReplicaPos ( )

Get the replication position of this replica DB.

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

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ getScopedLockAndFlush()

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

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

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

This is suitable 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 also: query}

Since: 1.27

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by LinksUpdate\acquirePageLock().

◆ getServer()

Wikimedia\Rdbms\IDatabase::getServer ( )

Get the hostname or IP address of the server.

Returns: string|null

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getServerInfo()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getServerName()

Wikimedia\Rdbms\IDatabase::getServerName ( )

Get the readable name for the server.

Returns: string Readable server name, falling back to the hostname or IP address

Since: 1.36

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\closeAll(), Wikimedia\Rdbms\LoadBalancer\getConnLogContext(), Wikimedia\Rdbms\LoadBalancer\isPrimaryConnectionReadOnly(), and SqlBagOStuff\makeTimestampedModificationToken().

◆ getServerUptime()

Wikimedia\Rdbms\IDatabase::getServerUptime ( )

Determines how long the server has been up.

Returns: int

Exceptions

DBError

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ getServerVersion()

Wikimedia\Rdbms\IDatabase::getServerVersion ( )

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

Returns: string Version information from the database server.

Implemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

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

◆ getSessionLagStatus()

Wikimedia\Rdbms\IDatabase::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 also: query}

Since: 1.27

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getSoftwareLink()

Wikimedia\Rdbms\IDatabase::getSoftwareLink ( )

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

"[https://www.mysql.com/ MySQL]")

Should at least contain plain text, if for some reason your database has no website.

Returns: string Wikitext of a link to the server software's web site

Implemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ getTopologyBasedServerId()

Wikimedia\Rdbms\IDatabase::getTopologyBasedServerId ( )

Get a non-recycled ID that uniquely identifies this server within the replication topology.

A replication topology defines which servers can originate changes to a given dataset and how those changes propagate among database servers. It is assumed that the server only participates in the replication of a single relevant dataset.

Returns: string|null 32, 64, or 128 bit integer ID; null if not applicable or unknown

Exceptions

DBQueryError

Since: 1.37

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\makeTimestampedModificationToken().

◆ getTopologyRole()

Wikimedia\Rdbms\IDatabase::getTopologyRole ( )

Get the replication topology role of this server.

A replication topology defines which servers can originate changes to a given dataset and how those changes propagate among database servers. It is assumed that the server only participates in the replication of a single relevant dataset.

Returns: string One of the class ROLE_* constants

Exceptions

DBQueryError

Since: 1.34

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getTopologyRootMaster()

Wikimedia\Rdbms\IDatabase::getTopologyRootMaster ( )

Deprecated:: since 1.37; use getTopologyRootPrimary() instead.

Returns: string|null Readable server name; null if unknown or if co-primaries are defined

Exceptions

DBQueryError

Since: 1.34

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getTopologyRootPrimary()

Wikimedia\Rdbms\IDatabase::getTopologyRootPrimary ( )

Get the readable name of the sole root primary DB server for the replication topology.

A replication topology defines which servers can originate changes to a given dataset and how those changes propagate among database servers. It is assumed that the server only participates in the replication of a single relevant dataset.

Returns: string|null Readable server name; null if unknown or if co-primaries are defined

Exceptions

DBQueryError

Since: 1.37

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ getType()

Wikimedia\Rdbms\IDatabase::getType ( )

Get the RDBMS type of the server (e.g.

"mysql", "sqlite")

Returns: string

Implemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\addCasTokenFields(), PopulateArchiveRevId\checkMysqlAutoIncrementBug(), Wikimedia\Rdbms\SelectQueryBuilder\connection(), SqlBagOStuff\getConnectionFromServerInfo(), DatabaseInstaller\getSqlFilePath(), WatchedItemQueryService\getWatchedItemsWithRCInfoQueryConds(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), DatabaseUpdater\newForDB(), and DatabaseUpdater\patchPath().

◆ implicitOrderby()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

◆ indexExists()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ insert()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MigrateActors\addActorsForRows(), User\addToDatabase(), PopulateArchiveRevId\checkMysqlAutoIncrementBug(), CommentStore\createComment(), JobQueueDB\doBatchPushInternal(), LCStoreDB\finishWrite(), MediaWiki\Revision\RevisionStore\insertContentRowOn(), CommentStore\insertInternal(), MediaWiki\Revision\RevisionStore\insertIpChangesRow(), User\insertNewUser(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), MediaWiki\Revision\RevisionStore\insertSlotRowOn(), MigrateComments\loadCommentIDs(), PopulateArchiveRevId\reassignArRevIds(), QueryPage\recache(), and MediaWiki\Storage\NameTableStore\retryStore().

◆ insertId()

Wikimedia\Rdbms\IDatabase::insertId ( )

Get the inserted value of an auto-increment row.

This should only be called after an insert that used an auto-incremented value. If no such insert was previously done in the current database session, the return value is undefined.

Returns: int

Implemented in Wikimedia\Rdbms\DatabaseMysqli, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by User\addToDatabase(), PopulateArchiveRevId\checkMysqlAutoIncrementBug(), CommentStore\createComment(), MediaWiki\Revision\RevisionStore\insertContentRowOn(), and MediaWiki\Revision\RevisionStore\insertRevisionRowOn().

◆ insertSelect()

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

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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ isOpen()

Wikimedia\Rdbms\IDatabase::isOpen ( )

Returns: bool Whether a connection to the database open

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ isReadOnly()

Wikimedia\Rdbms\IDatabase::isReadOnly ( )

Returns: bool Whether this DB is read-only

Since: 1.27

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by LCStoreDB\startWrite().

◆ lastDoneWrites()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ lastErrno()

Wikimedia\Rdbms\IDatabase::lastErrno ( )

Get the last error number.

See also: https://www.php.net/mysql_errno

Returns: int

Implemented in Wikimedia\Rdbms\DatabaseMysqli, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\Database\executeQueryAttempt(), Wikimedia\Rdbms\DatabaseMysqlBase\wasDeadlock(), Wikimedia\Rdbms\DatabaseMysqlBase\wasKnownStatementRollbackError(), Wikimedia\Rdbms\DatabaseMysqlBase\wasLockTimeout(), and Wikimedia\Rdbms\DatabaseMysqlBase\wasReadOnlyError().

◆ lastError()

Wikimedia\Rdbms\IDatabase::lastError ( )

Get a description of the last error.

See also: https://www.php.net/mysql_error

Returns: string

Implemented in Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

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

◆ lastQuery()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ limitResult()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

◆ lock()

Wikimedia\Rdbms\IDatabase::lock	(	$lockName,
		$method,
		$timeout = `5`,
		$flags = `0`
	)

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)
int	$flags	Bit field of IDatabase::LOCK_* constants

Returns: bool Success

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Revision\RevisionStore\insertRevisionRowOn().

◆ lockForUpdate()

Wikimedia\Rdbms\IDatabase::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 also: query}

Since: 1.32

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by LocalFileMoveBatch\verifyDBUpdates().

◆ lockIsFree()

Wikimedia\Rdbms\IDatabase::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 also: query}

Since: 1.20

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ makeList()

Wikimedia\Rdbms\IDatabase::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 also: 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 also: query}

Returns: string

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\DependencyStore\SqlModuleDependencyStore\fetchDependencyBlobs(), WatchedItemStore\fetchWatchedItems(), WatchedItemQueryService\getExtraDeletedPageLogEntryRelatedCond(), WatchedItemQueryService\getFromUntilTargetConds(), UppercaseTitlesForUnicodeTransition\getLikeBatches(), WatchedItemQueryService\getStartFromConds(), WANCacheReapUpdate\getTitleChangeEvents(), WatchedItemStore\getVisitingWatchersCondition(), WatchedItemQueryService\getWatchedItemsWithRCInfoQueryConds(), ActorMigrationBase\getWhere(), and MigrateComments\loadCommentIDs().

◆ makeWhereFrom2d()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ masterPosWait()

Wikimedia\Rdbms\IDatabase::masterPosWait	(	DBPrimaryPos	$pos,
			$timeout
	)

Deprecated:: since 1.37; use primaryPosWait() instead.

Parameters

DBPrimaryPos	$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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ maxListLen()

Wikimedia\Rdbms\IDatabase::maxListLen ( )

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

Returns: int

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ namedLocksEnqueue()

Wikimedia\Rdbms\IDatabase::namedLocksEnqueue ( )

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

Returns: bool

Since: 1.26

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ newSelectQueryBuilder()

Wikimedia\Rdbms\IDatabase::newSelectQueryBuilder ( )

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

Returns: SelectQueryBuilder

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ nextSequenceValue()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

◆ numFields()

Wikimedia\Rdbms\IDatabase::numFields ( IResultWrapper $res )

Get the number of fields in a result object.

See also: https://www.php.net/mysql_num_fields

Deprecated:: since 1.37

Parameters

IResultWrapper $res A SQL result

Returns: int

Implemented in Wikimedia\Rdbms\Database.

◆ numRows()

Wikimedia\Rdbms\IDatabase::numRows ( $res )

Get the number of rows in a query result.

Returns zero if the query did not return any rows or was a write query.

Deprecated:: since 1.37 use IResultWrapper::numRows()

Parameters

IResultWrapper | bool $res A SQL result

Returns: int

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ onAtomicSectionCancel()

Wikimedia\Rdbms\IDatabase::onAtomicSectionCancel	(	callable	$callback,
			$fname = `__METHOD__`
	)

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Storage\NameTableStore\retryStore().

◆ onTransactionCommitOrIdle()

Wikimedia\Rdbms\IDatabase::onTransactionCommitOrIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

Run a callback when 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 after all peer transactions COMMIT. If the transaction round is rolled back, then the callback is cancelled.

This IDatabase instance will start off in auto-commit mode when the callback starts. The use of other IDatabase handles from the callback should be avoided unless they are known to be in auto-commit mode. Callbacks that create transactions via begin() or startAtomic() must have matching calls to commit()/endAtomic().

Use this method only for the following purposes:

(a) RDBMS updates, prone to lock timeouts/deadlocks, that do not require atomicity with respect to the updates in the current transaction (if any)
(b) Purges to lightweight cache services due to RDBMS updates
(c) Updates to secondary DBs/stores that must only commit once the updates in the current transaction (if any) are committed (e.g. insert user account row to DB1, then, initialize corresponding LDAP account)

The callback takes the following arguments:

How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_IDLE)
This IDatabase instance (since 1.32)

Callbacks will execute in the order they were enqueued.

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError If an error occurs, {

See also: query}

Exceptions

Exception If the callback runs immediately and an error occurs in it

Since: 1.32

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ onTransactionIdle()

Wikimedia\Rdbms\IDatabase::onTransactionIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

Alias for onTransactionCommitOrIdle() for backwards-compatibility.

Parameters

callable	$callback
string	$fname

Since: 1.20

Deprecated:: Since 1.32

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ onTransactionPreCommitOrIdle()

Wikimedia\Rdbms\IDatabase::onTransactionPreCommitOrIdle	(	callable	$callback,
			$fname = `__METHOD__`
	)

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 after all peer transactions COMMIT. If the transaction round is rolled back, then the callback is cancelled.

If there is no current transaction, one will be created to wrap the callback. Callbacks cannot use begin()/commit() to manage transactions. The use of other IDatabase handles from the callback should be avoided.

Use this method only for the following purposes:

a) RDBMS updates, prone to lock timeouts/deadlocks, that require atomicity with respect to the updates in the current transaction (if any)
b) Purges to lightweight cache services due to RDBMS updates

The callback takes the one argument:

This IDatabase instance (since 1.32)

Callbacks will execute in the order they were enqueued.

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError If an error occurs, {

See also: query}

Exceptions

Exception If the callback runs immediately and an error occurs in it

Since: 1.22

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ onTransactionResolution()

Wikimedia\Rdbms\IDatabase::onTransactionResolution	(	callable	$callback,
			$fname = `__METHOD__`
	)

Run a callback when the current transaction commits or rolls back.

An error is thrown if no transaction is pending.

When transaction round mode (DBO_TRX) is set, the callback will run at the end of the round, just after all peer transactions COMMIT/ROLLBACK.

This IDatabase instance will start off in auto-commit mode when the callback starts. The use of other IDatabase handles from the callback should be avoided unless they are known to be in auto-commit mode. Callbacks that create transactions via begin() or startAtomic() must have matching calls to commit()/endAtomic().

Use this method only for the following purposes:

(a) Release of cooperative locks on resources
(b) Cancellation of in-proccess deferred tasks

The callback takes the following arguments:

How the current atomic section (if any) or overall transaction (otherwise) ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_ROLLBACK)
This IDatabase instance (since 1.32)

Callbacks will execute in the order they were enqueued.

Note: Use onAtomicSectionCancel() to take action as soon as an atomic section is cancelled

Parameters

callable	$callback
string	$fname	Caller name

Exceptions

DBError If an error occurs, {

See also: query}

Exceptions

Exception If the callback runs immediately and an error occurs in it

Since: 1.28

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by AtomicSectionUpdate\__construct(), AutoCommitUpdate\__construct(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), and MediaWiki\User\ActorStore\setUpRollbackHandler().

◆ pendingWriteCallers()

Wikimedia\Rdbms\IDatabase::pendingWriteCallers ( )

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

Returns: array

Since: 1.27

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ pendingWriteQueryDuration()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ pendingWriteRowsAffected()

Wikimedia\Rdbms\IDatabase::pendingWriteRowsAffected ( )

Get the number of affected rows from pending write queries.

Returns: int

Since: 1.30

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ ping()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\approvePrimaryChanges(), and Wikimedia\Rdbms\LoadBalancer\pingAll().

◆ preCommitCallbacksPending()

Wikimedia\Rdbms\IDatabase::preCommitCallbacksPending ( )

Returns: bool Whether there is a transaction open with pre-commit callbacks pending

Since: 1.32

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ primaryPosWait()

Wikimedia\Rdbms\IDatabase::primaryPosWait	(	DBPrimaryPos	$pos,
			$timeout
	)

Wait for the replica DB to catch up to a given primary DB 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

DBPrimaryPos	$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 also: query}

Since: 1.37

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

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

◆ query()

Wikimedia\Rdbms\IDatabase::query	(	$sql,
		$fname = `__METHOD__`,
		$flags = `0`
	)

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	Bit field 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)

Implemented in Wikimedia\Rdbms\DBConnRef, and Wikimedia\Rdbms\Database.

Referenced by MySqlLockManager\initConnection(), SqlBagOStuff\initSqliteDatabase(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), and MwSql\sqlDoQuery().

◆ replace()

Wikimedia\Rdbms\IDatabase::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. There must only be one such key. 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 $uniqueKeys 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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by WatchedItemStore\duplicateEntry(), SqlBagOStuff\modifyTableSpecificBlobsForSet(), and WatchedItemStore\updateExpiriesAfterMove().

◆ restoreFlags()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ rollback()

Wikimedia\Rdbms\IDatabase::rollback	(	$fname = `__METHOD__`,
		$flush = `self::FLUSHING_ONE`
	)

Rollback a transaction previously started using begin()

Only call this from code with outer transaction 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 preferable, 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 also: query}

Since: 1.23 Added $flush parameter

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\initSqliteDatabase(), PopulateArchiveRevId\makeDummyRevisionRow(), Wikimedia\Rdbms\LoadBalancer\rollbackPrimaryChanges(), and Maintenance\rollbackTransaction().

◆ select()

Wikimedia\Rdbms\IDatabase::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.

You can put simple join conditions here, but this is strongly discouraged. Instead of

// $conds...
'rev_actor = actor_id',

use (see below for $join_conds):

// $join_conds...
'actor' => [ 'JOIN', 'rev_actor = actor_id' ],

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. Simple conditions can also be specified in the regular $conds, but this is strongly discouraged in favor of the more explicit syntax here.

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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MigrateActors\addActorsForRows(), SqlBagOStuff\deleteServerObjectsExpiringBefore(), JobQueueDB\doBatchPushInternal(), RefreshImageMetadata\execute(), Wikimedia\DependencyStore\SqlModuleDependencyStore\fetchDependencyBlobs(), ResourceLoaderWikiModule\fetchTitleInfo(), ChangeTags\getTagsWithData(), WANCacheReapUpdate\getTitleChangeEvents(), MigrateComments\loadCommentIDs(), MediaWiki\Storage\NameTableStore\loadTable(), SqlBagOStuff\modifyTableSpecificBlobsForCas(), SqlBagOStuff\modifyTableSpecificBlobsForChangeTTL(), DeduplicateArchiveRevId\processArRevIds(), UppercaseTitlesForUnicodeTransition\processTable(), WatchedItemStore\updateExpiriesAfterMove(), and MediaWiki\Revision\RevisionStore\userWasLastToEdit().

◆ selectDB()

Wikimedia\Rdbms\IDatabase::selectDB ( $db )

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ selectDomain()

Wikimedia\Rdbms\IDatabase::selectDomain ( $domain )

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ selectField()

Wikimedia\Rdbms\IDatabase::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 also: select} for details.

Parameters

string | array $var The field name to select. This must be a valid SQL fragment: do not use unvalidated user input. Can be an array, but must contain exactly 1 element then. {

See also: select} for details.

Parameters

string | array $cond The condition array. {

See also: select} for details.

Parameters

string	$fname	The function name of the caller.
string \| array	$options	The query options. {

See also: select} for details.

Parameters

string | array $join_conds The query join conditions. {

See also: select} for details.

Returns: mixed|false The value from the field, or false if nothing was found

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by User\addToDatabase(), PopulateArchiveRevId\checkMysqlAutoIncrementBug(), CommentStore\createComment(), MediaWiki\Revision\RevisionStore\getPreviousRevisionId(), MediaWiki\Revision\RevisionStore\insertRevisionRowOn(), UppercaseTitlesForUnicodeTransition\isUserPage(), PopulateArchiveRevId\makeDummyRevisionRow(), and MediaWiki\Revision\RevisionStore\newNullRevision().

◆ selectFieldValues()

Wikimedia\Rdbms\IDatabase::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 also: select} for details.

Parameters

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 also: select} for details.

Parameters

string	$fname	The function name of the caller.
string \| array	$options	The query options. {

See also: select} for details.

Parameters

string | array $join_conds The query join conditions. {

See also: 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 also: query}

Since: 1.25

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by PurgeJobUtils\invalidatePages(), SqlBagOStuff\modifyTableSpecificBlobsForAdd(), UppercaseTitlesForUnicodeTransition\processUsers(), MediaWiki\Block\DatabaseBlockStore\purgeExpiredBlocks(), Title\purgeExpiredRestrictions(), and PopulateArchiveRevId\reassignArRevIds().

◆ selectRow()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Revision\RevisionStore\countRevisionsByPageId(), SiteStats\doLoadFromDB(), LinkCache\fetchPageRow(), MediaWiki\Revision\RevisionStore\fetchRevisionRowFromConds(), CommentStore\getCommentInternal(), PopulateArchiveRevId\makeDummyRevisionRow(), SqlBagOStuff\modifyTableSpecificBlobsForIncrInit(), DatabaseLogEntry\newFromId(), and UppercaseTitlesForUnicodeTransition\shouldDelete().

◆ selectRowCount()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by PopulateArchiveRevId\isNewInstall().

◆ selectSQLText()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Revision\RevisionStore\insertRevisionRowOn().

◆ serverIsReadOnly()

Wikimedia\Rdbms\IDatabase::serverIsReadOnly ( )

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

Exceptions

DBError If an error occurs, {

See also: query}

Since: 1.28

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

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

◆ setBigSelects()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

◆ setFlag()

Wikimedia\Rdbms\IDatabase::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]

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by DatabaseUpdater\__construct(), and JobQueueDB\getScopedNoTrxFlag().

◆ setIndexAliases()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ setLBInfo()

Wikimedia\Rdbms\IDatabase::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)

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ setSchemaVars()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ setSessionOptions()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, and Wikimedia\Rdbms\DBConnRef.

Referenced by BackupDumper\backupDb().

◆ setTableAliases()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ setTransactionListener()

Wikimedia\Rdbms\IDatabase::setTransactionListener	(		$name,
		callable	$callback = `null`
	)

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

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

◆ startAtomic()

Wikimedia\Rdbms\IDatabase::startAtomic	(	$fname = `__METHOD__`,
		$cancelable = `self::ATOMIC_NOT_CANCELABLE`
	)

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 also: query}

Implemented in Wikimedia\Rdbms\DBConnRef, and Wikimedia\Rdbms\Database.

Referenced by JobQueueDB\doBatchPushInternal(), LCStoreDB\finishWrite(), MySqlLockManager\initConnection(), SqlBagOStuff\initSqliteDatabase(), and SqlBagOStuff\modifyTableSpecificBlobsForIncrInit().

◆ strreplace()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ tableExists()

Wikimedia\Rdbms\IDatabase::tableExists	(	$table,
		$fname = `__METHOD__`
	)

Query whether a given table exists.

Parameters

string	$table
string	$fname

Returns: bool

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by SqlBagOStuff\getConnectionFromServerInfo(), and SqlBagOStuff\initSqliteDatabase().

◆ tablePrefix()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by CloneDatabase\__construct(), and SqlBagOStuff\initSqliteDatabase().

◆ timestamp()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

Referenced by User\addToDatabase(), SqlBagOStuff\buildExistenceConditions(), SqlBagOStuff\buildIncrUpsertSet(), SqlBagOStuff\decodeDbExpiry(), SqlBagOStuff\deleteServerObjectsExpiringBefore(), SqlBagOStuff\encodeDbExpiry(), MediaWiki\Revision\RevisionStore\getBaseRevisionRow(), WatchedItemQueryService\getStartEndConds(), WatchedItemQueryService\getStartFromConds(), WANCacheReapUpdate\getTitleChangeEvents(), WatchedItemStore\getVisitingWatchersCondition(), WatchedItemQueryService\getWatchedItemsWithRCInfoQueryConds(), JobQueueDB\insertFields(), MediaWiki\Revision\RevisionStore\insertIpChangesRow(), Title\invalidateCache(), PurgeJobUtils\invalidatePages(), PopulateArchiveRevId\makeDummyRevisionRow(), User\makeUpdateConditions(), WatchedItemStore\modifyForExpiry(), MediaWiki\Block\DatabaseBlockStore\purgeExpiredBlocks(), Title\purgeExpiredRestrictions(), QueryPage\recache(), User\saveSettings(), MediaWiki\Page\RollbackPage\updateRecentChange(), and MediaWiki\Revision\RevisionStore\userWasLastToEdit().

◆ timestampOrNull()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by User\addToDatabase(), and User\saveSettings().

◆ trxLevel()

Wikimedia\Rdbms\IDatabase::trxLevel ( )

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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\enforceConnectionFlags(), and MediaWiki\User\ActorStore\setUpRollbackHandler().

◆ trxTimestamp()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ unionConditionPermutations()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ unionQueries()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ unionSupportsOrderAndLimit()

Wikimedia\Rdbms\IDatabase::unionSupportsOrderAndLimit ( )

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

Returns: bool

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ unlock()

Wikimedia\Rdbms\IDatabase::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 also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by MediaWiki\Revision\RevisionStore\insertRevisionRowOn().

◆ update()

Wikimedia\Rdbms\IDatabase::update	(	$table,
		$set,
		$conds,
		$fname = `__METHOD__`,
		$options = `[]`
	)

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

Parameters

string	$table	Table name
array	$set	Combination map/list where each string-keyed entry maps a column to a literal assigned value and each integer-keyed value is a SQL expression in the format of a column assignment within UPDATE...SET. The (column => value) entries are convenient due to automatic value quoting and conversion of null to NULL. The SQL assignment format is useful for updates like "column = column + X". All assignments have no defined execution order, so they should not depend on each other. Do not modify AUTOINCREMENT or UUID columns in assignments.
array \| string	$conds	Condition in the format of IDatabase::select() conditions. In order to prevent possible performance or replication issues or damaging a data accidentally, an empty condition for 'update' queries isn't allowed. IDatabase::ALL_ROWS should be passed explicitely in order to update all rows.
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 update of rows that would cause unique key conflicts. IDatabase::affectedRows() can be used to determine how many rows were updated.

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

Exceptions

DBError If an error occurs, {

See also: query}

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by SiteStatsUpdate\cacheUpdate(), LocalFileMoveBatch\doDBUpdates(), UppercaseTitlesForUnicodeTransition\doMove(), SiteStatsUpdate\doUpdate(), UppercaseTitlesForUnicodeTransition\doUpdate(), Title\invalidateCache(), PurgeJobUtils\invalidatePages(), SqlBagOStuff\modifyTableSpecificBlobsForChangeTTL(), DeleteLocalPasswords\processUsers(), PopulateArchiveRevId\reassignArRevIds(), User\saveSettings(), and MediaWiki\Page\RollbackPage\updateRecentChange().

◆ upsert()

Wikimedia\Rdbms\IDatabase::upsert	(		$table,
		array	$rows,
			$uniqueKeys,
		array	$set,
			$fname = `__METHOD__`
	)

Upsert the given row(s) into a table.

This updates any existing rows that conflict with the provided rows and inserts any of the provided rows that do not conflict with existing rows. Conflicts are determined by the provided unique indexes.

Parameters

string	$table	Table name
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 $uniqueKeys 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 \| string[] \| string[][]	$uniqueKeys	Column name or non-empty list of column name lists that define all applicable unique keys on the table. There must only be one such key. 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 Passing string[] to $uniqueKeys is deprecated.
array	$set	Combination map/list where each string-keyed entry maps a column to a literal assigned value and each integer-keyed value is a SQL assignment expression of the form "<unquoted alphanumeric column> = <SQL expression>". The (column => value) entries are convenient due to automatic value quoting and conversion of null to NULL. The SQL assignment entries are useful for updates like "column = column + X". All of the assignments have no defined execution order, so callers should make sure that they not depend on each other. Do not modify AUTOINCREMENT or UUID columns in assignments, even if they are just "secondary" unique keys.
string	$fname	Calling function name (use METHOD) for logs/profiling

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

Exceptions

DBError If an error occurs, {

See also: query}

Since: 1.22

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by ActorMigrationBase\getInsertValuesWithTempTable(), SqlBagOStuff\modifyTableSpecificBlobsForAdd(), SqlBagOStuff\modifyTableSpecificBlobsForCas(), SqlBagOStuff\modifyTableSpecificBlobsForChangeTTL(), SqlBagOStuff\modifyTableSpecificBlobsForDelete(), SqlBagOStuff\modifyTableSpecificBlobsForIncrInit(), and SqlBagOStuff\modifyTableSpecificBlobsForSet().

◆ wasConnectionLoss()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ wasDeadlock()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

◆ wasErrorReissuable()

Wikimedia\Rdbms\IDatabase::wasErrorReissuable ( )

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

Note that the transaction may have been lost, discarding prior writes and results

Returns: bool

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

◆ wasLockTimeout()

Wikimedia\Rdbms\IDatabase::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

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabasePostgres, and Wikimedia\Rdbms\DBConnRef.

◆ wasReadOnlyError()

Wikimedia\Rdbms\IDatabase::wasReadOnlyError ( )

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

Returns: bool

Implemented in Wikimedia\Rdbms\Database, Wikimedia\Rdbms\DatabaseMysqlBase, Wikimedia\Rdbms\DatabaseSqlite, and Wikimedia\Rdbms\DBConnRef.

Referenced by LCStoreDB\finishWrite().

◆ writesOrCallbacksPending()

Wikimedia\Rdbms\IDatabase::writesOrCallbacksPending ( )

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

This does not count recurring callbacks, e.g. from setTransactionListener().

Returns: bool

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Referenced by Wikimedia\Rdbms\LoadBalancer\approvePrimaryChanges(), DeferredUpdates\areDatabaseTransactionsActive(), and Wikimedia\Rdbms\LoadBalancer\hasPrimaryChanges().

◆ writesPending()

Wikimedia\Rdbms\IDatabase::writesPending ( )

Returns: bool Whether there is a transaction open with possible write queries

Since: 1.27

Implemented in Wikimedia\Rdbms\Database, and Wikimedia\Rdbms\DBConnRef.

Member Data Documentation

◆ LOCK_TIMESTAMP

const Wikimedia\Rdbms\IDatabase::LOCK_TIMESTAMP = 1

Flag to return the lock acquision timestamp (null if not acquired)

Definition at line 136 of file IDatabase.php.

The documentation for this interface was generated from the following file:

includes/libs/rdbms/database/IDatabase.php

Public Member Functions

Public Attributes

Detailed Description

Member Function Documentation

◆ __toString()

◆ addIdentifierQuotes()

◆ addQuotes()

◆ affectedRows()

◆ aggregateValue()

◆ anyChar()

◆ anyString()

◆ assertNoOpenTransactions()

◆ begin()

◆ bitAnd()

◆ bitNot()

◆ bitOr()

◆ buildConcat()

◆ buildGreatest()

◆ buildGroupConcatField()

◆ buildIntegerCast()

◆ buildLeast()

◆ buildLike()

◆ buildSelectSubquery()

◆ buildStringCast()

◆ buildSubString()

◆ cancelAtomic()

◆ clearFlag()

◆ close()

◆ commit()

◆ conditional()

◆ databasesAreIndependent()

◆ dataSeek()

◆ dbSchema()

◆ decodeBlob()

◆ decodeExpiry()

◆ delete()

◆ deleteJoin()

◆ doAtomicSection()

◆ encodeBlob()

◆ encodeExpiry()

◆ endAtomic()

◆ estimateRowCount()

◆ explicitTrxActive()

◆ fetchObject()

◆ fetchRow()

◆ fieldExists()

◆ fieldName()

◆ flushSnapshot()

◆ freeResult()

◆ getDBname()

◆ getDomainID()

◆ getFlag()

◆ getInfinity()

◆ getLag()

◆ getLBInfo()

◆ getMasterPos()

◆ getPrimaryPos()

◆ getReplicaPos()

◆ getScopedLockAndFlush()

◆ getServer()

◆ getServerInfo()

◆ getServerName()

◆ getServerUptime()

◆ getServerVersion()

◆ getSessionLagStatus()

◆ getSoftwareLink()

◆ getTopologyBasedServerId()

◆ getTopologyRole()

◆ getTopologyRootMaster()

◆ getTopologyRootPrimary()

◆ getType()

◆ implicitOrderby()

◆ indexExists()

◆ insert()

◆ insertId()

◆ insertSelect()

◆ isOpen()

◆ isReadOnly()

◆ lastDoneWrites()

◆ lastErrno()