Result wrapper for grabbing data queried from an IDatabase object. More...

Inheritance diagram for Wikimedia\Rdbms\ResultWrapper:

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Collaboration diagram for Wikimedia\Rdbms\ResultWrapper:

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Public Member Functions
	__construct (IDatabase $db=null, $result)
	Create a row iterator from a result resource and an optional Database object.

	current ()

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

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

	free ()
	Free a result object.

	key ()

	next ()

	numRows ()
	Get the number of rows in a result object.

	rewind ()

	seek ( $row)
	Change the position of the cursor in a result object.

	valid ()

Public Attributes
resource array null	$result
	Optional underlying result handle for subclass usage.

Protected Attributes
stdClass null	$currentRow = null

IDatabase null	$db

int	$pos = 0

Private Member Functions
	getDB ()

Detailed Description

Result wrapper for grabbing data queried from an IDatabase object.

Note that using the Iterator methods in combination with the non-Iterator DB result iteration functions may cause rows to be skipped or repeated.

By default, this will use the iteration methods of the IDatabase handle if provided. Subclasses can override methods to make it solely work on the result resource instead. If no database is provided, and the subclass does not override the DB iteration methods, then a RuntimeException will be thrown when iteration is attempted.

The result resource field should not be accessed from non-Database related classes. It is database class specific and is stored here to associate iterators with queries.

Definition at line 24 of file ResultWrapper.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\ResultWrapper::__construct	(	IDatabase	$db = `null`,
			$result
	)

Create a row iterator from a result resource and an optional Database object.

Only Database-related classes should construct ResultWrapper. Other code may use the FakeResultWrapper subclass for convenience or compatibility shims, however.

Parameters

IDatabase \| null	$db	Optional database handle
ResultWrapper \| array \| resource	$result	Optional underlying result handle

Definition at line 45 of file ResultWrapper.php.

References Wikimedia\Rdbms\ResultWrapper\$db, and Wikimedia\Rdbms\ResultWrapper\$result.

Member Function Documentation

◆ current()

Wikimedia\Rdbms\ResultWrapper::current ( )

Returns: stdClass|array|bool

Implements Wikimedia\Rdbms\IResultWrapper.

Definition at line 97 of file ResultWrapper.php.

References Wikimedia\Rdbms\ResultWrapper\$currentRow, and Wikimedia\Rdbms\ResultWrapper\next().

Referenced by Wikimedia\Rdbms\ResultWrapper\valid().

◆ fetchObject()

Wikimedia\Rdbms\ResultWrapper::fetchObject ( )

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.

Returns: stdClass|bool

Exceptions

DBUnexpectedError Thrown if the database returns an error

Implements Wikimedia\Rdbms\IResultWrapper.

Reimplemented in Wikimedia\Rdbms\FakeResultWrapper, and Wikimedia\Rdbms\MssqlResultWrapper.

Definition at line 58 of file ResultWrapper.php.

References Wikimedia\Rdbms\ResultWrapper\getDB().

Referenced by Wikimedia\Rdbms\ResultWrapper\next().

◆ fetchRow()

Wikimedia\Rdbms\ResultWrapper::fetchRow ( )

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.

Returns: array|bool

Exceptions

DBUnexpectedError Thrown if the database returns an error

Implements Wikimedia\Rdbms\IResultWrapper.

Reimplemented in Wikimedia\Rdbms\FakeResultWrapper, and Wikimedia\Rdbms\MssqlResultWrapper.

Definition at line 62 of file ResultWrapper.php.

References Wikimedia\Rdbms\ResultWrapper\getDB().

◆ free()

Wikimedia\Rdbms\ResultWrapper::free ( )

Free a result object.

This either saves memory in PHP (buffered queries) or on the server (unbuffered queries). In general, queries are not large enough in result sets for this to be worth calling.

Implements Wikimedia\Rdbms\IResultWrapper.

Reimplemented in Wikimedia\Rdbms\FakeResultWrapper.

Definition at line 70 of file ResultWrapper.php.