maintenance/purgeOldText.inc

   1 <?php
   2
   3 /**
   4  * Support functions for cleaning up redundant text records
   5  *
   6  * @addtogroup Maintenance
   7  * @author Rob Church <robchur@gmail.com>
   8  */
   9
  10 function PurgeRedundantText( $delete = false ) {
  11
  12         # Data should come off the master, wrapped in a transaction
  13         $dbw = wfGetDB( DB_MASTER );
  14         $dbw->begin();
  15
  16         $tbl_arc = $dbw->tableName( 'archive' );
  17         $tbl_rev = $dbw->tableName( 'revision' );
  18         $tbl_txt = $dbw->tableName( 'text' );
  19
  20         # Get "active" text records from the revisions table
  21         echo( "Searching for active text records in revisions table..." );
  22         $res = $dbw->query( "SELECT DISTINCTROW rev_text_id FROM $tbl_rev" );
  23         while( $row = $dbw->fetchObject( $res ) ) {
  24                 $cur[] = $row->rev_text_id;
  25         }
  26         echo( "done.\n" );
  27
  28         # Get "active" text records from the archive table
  29         echo( "Searching for active text records in archive table..." );
  30         $res = $dbw->query( "SELECT DISTINCTROW ar_text_id FROM $tbl_arc" );
  31         while( $row = $dbw->fetchObject( $res ) ) {
  32                 $cur[] = $row->ar_text_id;
  33         }
  34         echo( "done.\n" );
  35
  36         # Get the IDs of all text records not in these sets
  37         echo( "Searching for inactive text records..." );
  38         $set = implode( ', ', $cur );
  39         $res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
  40         $old = array();
  41         while( $row = $dbw->fetchObject( $res ) ) {
  42                 $old[] = $row->old_id;
  43         }
  44         echo( "done.\n" );
  45
  46         # Inform the user of what we're going to do
  47         $count = count( $old );
  48         echo( "$count inactive items found.\n" );
  49
  50         # Delete as appropriate
  51         if( $delete && $count ) {
  52                 echo( "Deleting..." );
  53                 $set = implode( ', ', $old );
  54                 $dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
  55                 echo( "done.\n" );
  56         }
  57
  58         # Done
  59         $dbw->commit();
  60
  61 }
  62
  63 ?>