maintenance/purgeOldText.inc

   1 <?php
   2
   3 /**
   4  * Support functions for cleaning up redundant text records
   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  * @file
  22  * @ingroup Maintenance
  23  * @author Rob Church <robchur@gmail.com>
  24  */
  25
  26 function PurgeRedundantText( $delete = false ) {
  27
  28         # Data should come off the master, wrapped in a transaction
  29         $dbw = wfGetDB( DB_MASTER );
  30         $dbw->begin();
  31
  32         $tbl_arc = $dbw->tableName( 'archive' );
  33         $tbl_rev = $dbw->tableName( 'revision' );
  34         $tbl_txt = $dbw->tableName( 'text' );
  35
  36         # Get "active" text records from the revisions table
  37         echo( "Searching for active text records in revisions table..." );
  38         $res = $dbw->query( "SELECT DISTINCT rev_text_id FROM $tbl_rev" );
  39         foreach ( $res as $row ) {
  40                 $cur[] = $row->rev_text_id;
  41         }
  42         echo( "done.\n" );
  43
  44         # Get "active" text records from the archive table
  45         echo( "Searching for active text records in archive table..." );
  46         $res = $dbw->query( "SELECT DISTINCT ar_text_id FROM $tbl_arc" );
  47         foreach ( $res as $row ) {
  48                 $cur[] = $row->ar_text_id;
  49         }
  50         echo( "done.\n" );
  51
  52         # Get the IDs of all text records not in these sets
  53         echo( "Searching for inactive text records..." );
  54         $set = implode( ', ', $cur );
  55         $res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
  56         $old = array();
  57         foreach ( $res as $row ) {
  58                 $old[] = $row->old_id;
  59         }
  60         echo( "done.\n" );
  61
  62         # Inform the user of what we're going to do
  63         $count = count( $old );
  64         echo( "$count inactive items found.\n" );
  65
  66         # Delete as appropriate
  67         if ( $delete && $count ) {
  68                 echo( "Deleting..." );
  69                 $set = implode( ', ', $old );
  70                 $dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
  71                 echo( "done.\n" );
  72         }
  73
  74         # Done
  75         $dbw->commit();
  76
  77 }