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<?php
/**
* This file contains database access object related constants.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Database
*/
/**
* Helper class for DAO classes
*
* @since 1.26
*/
class DBAccessObjectUtils {
/**
* @param integer $bitfield
* @param integer $flags IDBAccessObject::READ_* constant
* @return bool Bitfield has flag $flag set
*/
public static function hasFlags( $bitfield, $flags ) {
return ( $bitfield & $flags ) == $flags;
}
/**
* Get an appropriate DB index and options for a query
*
* @param integer $bitfield
* @return array (DB_MASTER/DB_SLAVE, SELECT options array)
*/
public static function getDBOptions( $bitfield ) {
$index = self::hasFlags( $bitfield, IDBAccessObject::READ_LATEST )
? DB_MASTER
: DB_SLAVE;
$options = array();
if ( self::hasFlags( $bitfield, IDBAccessObject::READ_EXCLUSIVE ) ) {
$options[] = 'FOR UPDATE';
} elseif ( self::hasFlags( $bitfield, IDBAccessObject::READ_LOCKING ) ) {
$options[] = 'LOCK IN SHARE MODE';
}
return array( $index, $options );
}
}
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