maintenance/renameDbPrefix.php

   1 <?php
   2 /**
   3  * Run this script to after changing $wgDBprefix on a wiki.
   4  * The wiki will have to get downtime to do this correctly.
   5  *
   6  * @file
   7  * @ingroup Maintenance
   8  */
   9
  10 require_once( "Maintenance.php" );
  11
  12 class RenameDbPrefix extends Maintenance {
  13         public function __construct() {
  14                 parent::__construct();
  15                 $this->addParam( "old", "Old db prefix [0 for none]", true, true );
  16                 $this->addParam( "new", "New db prefix [0 for none]", true, true );
  17         }
  18
  19         public function execute() {
  20                 // Allow for no old prefix
  21                 if( $this->getOption( 'old', 0 ) === '0' ) {
  22                         $old = '';
  23                 } else {
  24                         // Use nice safe, sane, prefixes
  25                         preg_match( '/^[a-zA-Z]+_$/', $this->getOption('old'), $m );
  26                         $old = isset( $m[0] ) ? $m[0] : false;
  27                 }
  28                 // Allow for no new prefix
  29                 if( $this->getOption( 'new', 0 ) === '0' ) {
  30                         $new = '';
  31                 } else {
  32                         // Use nice safe, sane, prefixes
  33                         preg_match( '/^[a-zA-Z]+_$/', $this->getOption('new'), $m );
  34                         $new = isset( $m[0] ) ? $m[0] : false;
  35                 }
  36
  37                 if( $old === false || $new === false ) {
  38                         $this->error( "Invalid prefix!\n", true );
  39                 }
  40                 if( $old === $new ) {
  41                         $this->( "Same prefix. Nothing to rename!\n", true );
  42                 }
  43
  44                 $this->output( "Renaming DB prefix for tables of $wgDBname from '$old' to '$new'\n" );
  45                 $count = 0;
  46
  47                 $dbw = wfGetDB( DB_MASTER );
  48                 $res = $dbw->query( "SHOW TABLES LIKE '".$dbw->escapeLike( $old )."%'" );
  49                 foreach( $res as $row ) {
  50                         // XXX: odd syntax. MySQL outputs an oddly cased "Tables of X"
  51                         // sort of message. Best not to try $row->x stuff...
  52                         $fields = get_object_vars( $row );
  53                         // Silly for loop over one field...
  54                         foreach( $fields as $resName => $table ) {
  55                                 // $old should be regexp safe ([a-zA-Z_])
  56                                 $newTable = preg_replace( '/^'.$old.'/', $new, $table );
  57                                 $this->output( "Renaming table $table to $newTable\n" );
  58                                 $dbw->query( "RENAME TABLE $table TO $newTable" );
  59                         }
  60                         $count++;
  61                 }
  62                 $this->output( "Done! [$count tables]\n" );
  63         }
  64 }