maintenance/convertLinks.php

   1 <?php
   2
   3 # Convert from the old links schema (string->ID) to the new schema (ID->ID)
   4 # This hasn't been tested yet, so expect bugs
   5
   6 # The wiki should be put into read-only mode while this script executes
   7
   8 include_once( "commandLine.inc" );
   9
  10 # Check if it's already done
  11
  12 $res = wfQuery( "SELECT * FROM links LIMIT 1", DB_WRITE );
  13 if ( !wfNumRows( $res ) ) {
  14         print "No rows to convert. Updating schema...\n";
  15         createTable();
  16 } else {
  17         $row = wfFetchObject( $res );
  18         if ( is_numeric( $row->l_from ) ) {
  19                 print "Schema already converted\n";
  20                 exit;
  21         }
  22
  23         # Create a title -> cur_id map
  24
  25         print "Loading IDs...";
  26
  27         wfBufferSQLResults( false );
  28         $res = wfQuery( "SELECT cur_namespace,cur_title,cur_id FROM cur", DB_WRITE );
  29         $ids = array();
  30
  31         while ( $row = wfFetchObject( $res ) ) {
  32                 $title = $row->cur_title;
  33                 if ( $row->cur_namespace ) {
  34                         $title = $wgLang->getNsText( $row->cur_namespace ) . ":$title";
  35                 }
  36                 $ids[$title] = $row->cur_id;
  37         }
  38         wfFreeResult( $res );
  39
  40         print "done\n";
  41
  42         # Now, load in all the links and create a links table in RAM
  43         print "Processing links...\n";
  44         $res = wfQuery( "SELECT * FROM links", DB_WRITE );
  45         $links = array();
  46         $numBad = 0;
  47
  48         while ( $row = wfFetchObject( $res ) ) {
  49                 if ( array_key_exists( $row->l_from, $ids ) ) {
  50                         $links[$ids[$row->l_from]] = $row->l_to;
  51                 } else {
  52                         $numBad ++;
  53                 }
  54         }
  55
  56         print "Done, $numBad invalid titles\n";
  57
  58         # Save it to a new table
  59         createTable();
  60         $sql = "INSERT INTO links_temp(l_from,l_to) VALUES ";
  61
  62         $first = true;
  63         foreach( $links as $from => $to ) {
  64                 if ( $first ) {
  65                         $first = false;
  66                 } else {
  67                         $sql .= ",";
  68                 }
  69                 $sql .= "($from,$to)";
  70         }
  71
  72         wfQuery( $sql, DB_WRITE );
  73 }
  74
  75 # Swap in the new table
  76 wfQuery( "RENAME TABLE links TO links_backup, links_temp TO links" );
  77
  78 print "Conversion complete. The old table remains at links_backup, delete at your leisure.\n";
  79
  80 function createTable() {
  81         wfQuery( "CREATE TABLE links_temp (
  82           l_from int(8) unsigned NOT NULL default '0',
  83           l_to int(8) unsigned NOT NULL default '0',
  84           UNIQUE KEY l_from(l_from,l_to),
  85           KEY (l_to))", DB_WRITE);
  86 }
  87
  88 ?>