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   1  <?php
   2  /**
   3   * Change the prefix of database tables.
   4   * Run this script to after changing $wgDBprefix on a wiki.
   5   * The wiki will have to get downtime to do this correctly.
   6   *
   7   * This program is free software; you can redistribute it and/or modify
   8   * it under the terms of the GNU General Public License as published by
   9   * the Free Software Foundation; either version 2 of the License, or
  10   * (at your option) any later version.
  11   *
  12   * This program is distributed in the hope that it will be useful,
  13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15   * GNU General Public License for more details.
  16   *
  17   * You should have received a copy of the GNU General Public License along
  18   * with this program; if not, write to the Free Software Foundation, Inc.,
  19   * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20   * http://www.gnu.org/copyleft/gpl.html
  21   *
  22   * @file
  23   * @ingroup Maintenance
  24   */
  25  
  26  require_once  __DIR__ . '/Maintenance.php';
  27  
  28  /**
  29   * Maintenance script that changes the prefix of database tables.
  30   *
  31   * @ingroup Maintenance
  32   */
  33  class RenameDbPrefix extends Maintenance {
  34  	public function __construct() {
  35          parent::__construct();
  36          $this->addOption( "old", "Old db prefix [0 for none]", true, true );
  37          $this->addOption( "new", "New db prefix [0 for none]", true, true );
  38      }
  39  
  40  	public function getDbType() {
  41          return Maintenance::DB_ADMIN;
  42      }
  43  
  44  	public function execute() {
  45          global $wgDBname;
  46  
  47          // Allow for no old prefix
  48          if ( $this->getOption( 'old', 0 ) === '0' ) {
  49              $old = '';
  50          } else {
  51              // Use nice safe, sane, prefixes
  52              preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'old' ), $m );
  53              $old = isset( $m[0] ) ? $m[0] : false;
  54          }
  55          // Allow for no new prefix
  56          if ( $this->getOption( 'new', 0 ) === '0' ) {
  57              $new = '';
  58          } else {
  59              // Use nice safe, sane, prefixes
  60              preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'new' ), $m );
  61              $new = isset( $m[0] ) ? $m[0] : false;
  62          }
  63  
  64          if ( $old === false || $new === false ) {
  65              $this->error( "Invalid prefix!", true );
  66          }
  67          if ( $old === $new ) {
  68              $this->output( "Same prefix. Nothing to rename!\n", true );
  69          }
  70  
  71          $this->output( "Renaming DB prefix for tables of $wgDBname from '$old' to '$new'\n" );
  72          $count = 0;
  73  
  74          $dbw = wfGetDB( DB_MASTER );
  75          $res = $dbw->query( "SHOW TABLES " . $dbw->buildLike( $old, $dbw->anyString() ) );
  76          foreach ( $res as $row ) {
  77              // XXX: odd syntax. MySQL outputs an oddly cased "Tables of X"
  78              // sort of message. Best not to try $row->x stuff...
  79              $fields = get_object_vars( $row );
  80              // Silly for loop over one field...
  81              foreach ( $fields as $table ) {
  82                  // $old should be regexp safe ([a-zA-Z_])
  83                  $newTable = preg_replace( '/^' . $old . '/', $new, $table );
  84                  $this->output( "Renaming table $table to $newTable\n" );
  85                  $dbw->query( "RENAME TABLE $table TO $newTable" );
  86              }
  87              $count++;
  88          }
  89          $this->output( "Done! [$count tables]\n" );
  90      }
  91  }
  92  
  93  $maintClass = "RenameDbPrefix";
  94  require_once RUN_MAINTENANCE_IF_MAIN;