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<?php
/**
* Updates database rows by primary key in batches.
*
* 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 Maintenance
*/
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IDatabase;
class BatchRowWriter {
/**
* @var IDatabase The database to write to
*/
protected $db;
/**
* @var string The name of the table to update
*/
protected $table;
/**
* @var string|false A cluster name valid for use with LBFactory
*/
protected $clusterName;
/**
* @var string|null For debugging which method is using this class.
*/
protected $caller;
/**
* @param IDatabase $db The database to write to
* @param string $table The name of the table to update
* @param string|false $clusterName A cluster name valid for use with LBFactory
*/
public function __construct( IDatabase $db, $table, $clusterName = false ) {
$this->db = $db;
$this->table = $table;
$this->clusterName = $clusterName;
}
/**
* Use ->setCaller( __METHOD__ ) to indicate which code is using this
* class. Only used in debugging output.
* @since 1.36
*
* @param string $caller
* @return self
*/
public function setCaller( $caller ) {
$this->caller = $caller;
return $this;
}
/**
* @param array[][] $updates Array of arrays each containing two keys, 'primaryKey'
* and 'changes'. primaryKey must contain a map of column names to values
* sufficient to uniquely identify the row. changes must contain a map of column
* names to update values to apply to the row.
* @phan-param array<int,array{primaryKey:array,changes:array}> $updates
*/
public function write( array $updates ) {
$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
$ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ );
$caller = __METHOD__;
if ( (string)$this->caller !== '' ) {
$caller .= " (for {$this->caller})";
}
foreach ( $updates as $update ) {
$this->db->newUpdateQueryBuilder()
->update( $this->table )
->set( $update['changes'] )
->where( $update['primaryKey'] )
->caller( $caller )->execute();
}
$lbFactory->commitAndWaitForReplication( __METHOD__, $ticket );
}
}
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