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

Inherits Countable, and SeekableIterator.

Inherited by Wikimedia\Rdbms\ResultWrapper.

Collaboration diagram for Wikimedia\Rdbms\IResultWrapper:

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Public Member Functions
	count ()
	Get the number of rows in a result 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.

	getFieldNames ()
	Get the names of the fields in the result.

	key ()

	next ()

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

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

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 26 of file IResultWrapper.php.

Member Function Documentation

◆ count()

Wikimedia\Rdbms\IResultWrapper::count ( )

Get the number of rows in a result object.

Returns: int

Implemented in Wikimedia\Rdbms\ResultWrapper.

◆ current()

Wikimedia\Rdbms\IResultWrapper::current ( )

Returns: stdClass|array|false

Implemented in Wikimedia\Rdbms\ResultWrapper.

◆ fetchObject()

Wikimedia\Rdbms\IResultWrapper::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|false

Exceptions

DBUnexpectedError Thrown if the database returns an error

Implemented in Wikimedia\Rdbms\ResultWrapper.

Referenced by MediaWiki\Pager\IndexPager\extractResultInfo(), and MediaWiki\Specials\SpecialUndelete\formatRevisionHistory().

◆ fetchRow()

Wikimedia\Rdbms\IResultWrapper::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|false

Exceptions

DBUnexpectedError Thrown if the database returns an error

Implemented in Wikimedia\Rdbms\ResultWrapper.

Referenced by MediaWiki\Pager\IndexPager\extractResultInfo().

◆ free()

Wikimedia\Rdbms\IResultWrapper::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.

Implemented in Wikimedia\Rdbms\ResultWrapper.