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<?php
namespace Wikimedia\Rdbms;
use Iterator;
use stdClass;
/**
* 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.
*
* @ingroup Database
*/
interface IResultWrapper extends Iterator {
/**
* Get the number of rows in a result object
*
* @return int
*/
public function numRows();
/**
* 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.
*
* @return stdClass|bool
* @throws DBUnexpectedError Thrown if the database returns an error
*/
public function fetchObject();
/**
* 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.
*
* @return array|bool
* @throws DBUnexpectedError Thrown if the database returns an error
*/
public function fetchRow();
/**
* Change the position of the cursor in a result object.
* See mysql_data_seek()
*
* @param int $row
*/
public function seek( $row );
/**
* 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.
*/
public function free();
/**
* @return stdClass|array|bool
*/
public function current();
/**
* @return int
*/
public function key();
/**
* @return stdClass
*/
function next();
}
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