includes/utils/BatchRowWriter.php

   1 <?php
   2 /**
   3  * Updates database rows by primary key in batches.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance
  22  */
  23 class BatchRowWriter {
  24         /**
  25          * @var DatabaseBase $db The database to write to
  26          */
  27         protected $db;
  28
  29         /**
  30          * @var string $table The name of the table to update
  31          */
  32         protected $table;
  33
  34         /**
  35          * @var string $clusterName A cluster name valid for use with LBFactory
  36          */
  37         protected $clusterName;
  38
  39         /**
  40          * @param DatabaseBase $db          The database to write to
  41          * @param string       $table       The name of the table to update
  42          * @param string|bool  $clusterName A cluster name valid for use with LBFactory
  43          */
  44         public function __construct( DatabaseBase $db, $table, $clusterName = false ) {
  45                 $this->db = $db;
  46                 $this->table = $table;
  47                 $this->clusterName = $clusterName;
  48         }
  49
  50         /**
  51          * @param array $updates Array of arrays each containing two keys, 'primaryKey'
  52          *  and 'changes'. primaryKey must contain a map of column names to values
  53          *  sufficient to uniquely identify the row changes must contain a map of column
  54          *  names to update values to apply to the row.
  55          */
  56         public function write( array $updates ) {
  57                 $this->db->begin();
  58
  59                 foreach ( $updates as $update ) {
  60                         $this->db->update(
  61                                 $this->table,
  62                                 $update['changes'],
  63                                 $update['primaryKey'],
  64                                 __METHOD__
  65                         );
  66                 }
  67
  68                 $this->db->commit();
  69                 wfWaitForSlaves( false, false, $this->clusterName );
  70         }
  71 }