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 /**
  27  * @param bool $delete
  28  */
  29 function PurgeRedundantText( $delete = false ) {
  30
  31         # Data should come off the master, wrapped in a transaction
  32         $dbw = wfGetDB( DB_MASTER );
  33         $dbw->begin( __METHOD__ );
  34
  35         $tbl_arc = $dbw->tableName( 'archive' );
  36         $tbl_rev = $dbw->tableName( 'revision' );
  37         $tbl_txt = $dbw->tableName( 'text' );
  38
  39         # Get "active" text records from the revisions table
  40         echo "Searching for active text records in revisions table...";
  41         $res = $dbw->query( "SELECT DISTINCT rev_text_id FROM $tbl_rev" );
  42         foreach ( $res as $row ) {
  43                 $cur[] = $row->rev_text_id;
  44         }
  45         echo "done.\n";
  46
  47         # Get "active" text records from the archive table
  48         echo "Searching for active text records in archive table...";
  49         $res = $dbw->query( "SELECT DISTINCT ar_text_id FROM $tbl_arc" );
  50         $cur = array();
  51         foreach ( $res as $row ) {
  52                 $cur[] = $row->ar_text_id;
  53         }
  54         echo "done.\n";
  55
  56         # Get the IDs of all text records not in these sets
  57         echo "Searching for inactive text records...";
  58         $set = implode( ', ', $cur );
  59         $res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
  60         $old = array();
  61         foreach ( $res as $row ) {
  62                 $old[] = $row->old_id;
  63         }
  64         echo "done.\n";
  65
  66         # Inform the user of what we're going to do
  67         $count = count( $old );
  68         echo "$count inactive items found.\n";
  69
  70         # Delete as appropriate
  71         if ( $delete && $count ) {
  72                 echo "Deleting...";
  73                 $set = implode( ', ', $old );
  74                 $dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
  75                 echo "done.\n";
  76         }
  77
  78         # Done
  79         $dbw->commit( __METHOD__ );
  80 }