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<?php
/**
* Helper class for making a copy of the database, mostly for unit testing.
*
* Copyright © 2010 Chad Horohoe <chad@anyonecanedit.org>
* http://www.mediawiki.org/
*
* 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
*
* @ingroup Database
*/
class CloneDatabase {
/**
* Table prefix for cloning
* @var String
*/
private $newTablePrefix = '';
/**
* Current table prefix
* @var String
*/
private $oldTablePrefix = '';
/**
* List of tables to be cloned
* @var Array
*/
private $tablesToClone = array();
/**
* Should we DROP tables containing the new names?
* @var Bool
*/
private $dropCurrentTables = true;
/**
* Whether to use temporary tables or not
* @var Bool
*/
private $useTemporaryTables = true;
/**
* Constructor
*
* @param $db DatabaseBase A database subclass
* @param $tablesToClone Array An array of tables to clone, unprefixed
* @param $newTablePrefix String Prefix to assign to the tables
* @param $oldTablePrefix String Prefix on current tables, if not $wgDBprefix
* @param $dropCurrentTables bool
*/
public function __construct( DatabaseBase $db, array $tablesToClone,
$newTablePrefix, $oldTablePrefix = '', $dropCurrentTables = true )
{
$this->db = $db;
$this->tablesToClone = $tablesToClone;
$this->newTablePrefix = $newTablePrefix;
$this->oldTablePrefix = $oldTablePrefix ? $oldTablePrefix : $this->db->tablePrefix();
$this->dropCurrentTables = $dropCurrentTables;
}
/**
* Set whether to use temporary tables or not
* @param $u Bool Use temporary tables when cloning the structure
*/
public function useTemporaryTables( $u = true ) {
$this->useTemporaryTables = $u;
}
/**
* Clone the table structure
*/
public function cloneTableStructure() {
foreach( $this->tablesToClone as $tbl ) {
# Clean up from previous aborted run. So that table escaping
# works correctly across DB engines, we need to change the pre-
# fix back and forth so tableName() works right.
self::changePrefix( $this->oldTablePrefix );
$oldTableName = $this->db->tableName( $tbl, 'raw' );
self::changePrefix( $this->newTablePrefix );
$newTableName = $this->db->tableName( $tbl, 'raw' );
if( $this->dropCurrentTables && !in_array( $this->db->getType(), array( 'postgres', 'oracle' ) ) ) {
$this->db->dropTable( $tbl, __METHOD__ );
wfDebug( __METHOD__." dropping {$newTableName}\n", true);
//Dropping the oldTable because the prefix was changed
}
# Create new table
wfDebug( __METHOD__." duplicating $oldTableName to $newTableName\n", true );
$this->db->duplicateTableStructure( $oldTableName, $newTableName, $this->useTemporaryTables );
}
}
/**
* Change the prefix back to the original.
* @param $dropTables bool Optionally drop the tables we created
*/
public function destroy( $dropTables = false ) {
if( $dropTables ) {
self::changePrefix( $this->newTablePrefix );
foreach( $this->tablesToClone as $tbl ) {
$this->db->dropTable( $tbl );
}
}
self::changePrefix( $this->oldTablePrefix );
}
/**
* Change the table prefix on all open DB connections/
*
* @param $prefix
* @return void
*/
public static function changePrefix( $prefix ) {
global $wgDBprefix;
wfGetLBFactory()->forEachLB( array( 'CloneDatabase', 'changeLBPrefix' ), array( $prefix ) );
$wgDBprefix = $prefix;
}
/**
* @param $lb LoadBalancer
* @param $prefix
* @return void
*/
public static function changeLBPrefix( $lb, $prefix ) {
$lb->forEachOpenConnection( array( 'CloneDatabase', 'changeDBPrefix' ), array( $prefix ) );
}
/**
* @param $db DatabaseBase
* @param $prefix
* @return void
*/
public static function changeDBPrefix( $db, $prefix ) {
$db->tablePrefix( $prefix );
}
}
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