maintenance/deleteOldRevisions.php

   1 <?php
   2
   3 /**
   4  * Delete old (non-current) revisions from the database
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @ingroup Maintenance
  22  * @author Rob Church <robchur@gmail.com>
  23  */
  24
  25 require_once( dirname(__FILE__) . '/Maintenance.php' );
  26
  27 class DeleteOldRevisions extends Maintenance {
  28         public function __construct() {
  29                 parent::__construct();
  30                 $this->mDescription = "Delete old (non-current) revisions from the database";
  31                 $this->addOption( 'delete', 'Actually perform the deletion' );
  32                 $this->addOption( 'page_id', 'List of page ids to work on', false );
  33         }
  34
  35         public function execute() {
  36                 $this->output( "Delete old revisions\n\n" );
  37                 $this->doDelete( $this->hasOption( 'delete' ), $this->mArgs );
  38         }
  39
  40         function doDelete( $delete = false, $args = array() ) {
  41
  42                 # Data should come off the master, wrapped in a transaction
  43                 $dbw = wfGetDB( DB_MASTER );
  44                 $dbw->begin();
  45
  46                 $tbl_pag = $dbw->tableName( 'page' );
  47                 $tbl_rev = $dbw->tableName( 'revision' );
  48
  49                 $pageIdClause = '';
  50                 $revPageClause = '';
  51
  52                 # If a list of page_ids was provided, limit results to that set of page_ids
  53                 if ( sizeof( $args ) > 0 ) {
  54                         $pageIdList = implode( ',', $args );
  55                         $pageIdClause = " WHERE page_id IN ({$pageIdList})";
  56                         $revPageClause = " AND rev_page IN ({$pageIdList})";
  57                         $this->output( "Limiting to {$tbl_pag}.page_id IN ({$pageIdList})\n" );
  58                 }
  59
  60                 # Get "active" revisions from the page table
  61                 $this->output( "Searching for active revisions..." );
  62                 $res = $dbw->query( "SELECT page_latest FROM $tbl_pag{$pageIdClause}" );
  63                 foreach( $res as $row ) {
  64                         $cur[] = $row->page_latest;
  65                 }
  66                 $this->output( "done.\n" );
  67
  68                 # Get all revisions that aren't in this set
  69                 $old = array();
  70                 $this->output( "Searching for inactive revisions..." );
  71                 $set = implode( ', ', $cur );
  72                 $res = $dbw->query( "SELECT rev_id FROM $tbl_rev WHERE rev_id NOT IN ( $set ){$revPageClause}" );
  73                 foreach( $res as $row ) {
  74                         $old[] = $row->rev_id;
  75                 }
  76                 $this->output( "done.\n" );
  77
  78                 # Inform the user of what we're going to do
  79                 $count = count( $old );
  80                 $this->output( "$count old revisions found.\n" );
  81
  82                 # Delete as appropriate
  83                 if( $delete && $count ) {
  84                         $this->output( "Deleting..." );
  85                         $set = implode( ', ', $old );
  86                         $dbw->query( "DELETE FROM $tbl_rev WHERE rev_id IN ( $set )" );
  87                         $this->output( "done.\n" );
  88                 }
  89
  90                 # This bit's done
  91                 # Purge redundant text records
  92                 $dbw->commit();
  93                 if( $delete ) {
  94                         $this->purgeRedundantText( true );
  95                 }
  96         }
  97 }
  98
  99 $maintClass = "DeleteOldRevisions";
 100 require_once( DO_MAINTENANCE );
 101