renameDbPrefix.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class RenameDbPrefix extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->addOption( "old", "Old db prefix [0 for none]", true, true );
                $this->addOption( "new", "New db prefix [0 for none]", true, true );
        }

        public function getDbType() {
                return Maintenance::DB_ADMIN;
        }

        public function execute() {
                global $wgDBname;

                // Allow for no old prefix
                if ( $this->getOption( 'old', 0 ) === '0' ) {
                        $old = '';
                } else {
                        // Use nice safe, sane, prefixes
                        preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'old' ), $m );
                        $old = isset( $m[0] ) ? $m[0] : false;
                }
                // Allow for no new prefix
                if ( $this->getOption( 'new', 0 ) === '0' ) {
                        $new = '';
                } else {
                        // Use nice safe, sane, prefixes
                        preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'new' ), $m );
                        $new = isset( $m[0] ) ? $m[0] : false;
                }

                if ( $old === false || $new === false ) {
                        $this->error( "Invalid prefix!", true );
                }
                if ( $old === $new ) {
                        $this->output( "Same prefix. Nothing to rename!\n", true );
                }

                $this->output( "Renaming DB prefix for tables of $wgDBname from '$old' to '$new'\n" );
                $count = 0;

                $dbw = wfGetDB( DB_MASTER );
                $res = $dbw->query( "SHOW TABLES " . $dbw->buildLike( $old, $dbw->anyString() ) );
                foreach ( $res as $row ) {
                        // XXX: odd syntax. MySQL outputs an oddly cased "Tables of X"
                        // sort of message. Best not to try $row->x stuff...
                        $fields = get_object_vars( $row );
                        // Silly for loop over one field...
                        foreach ( $fields as $table ) {
                                // $old should be regexp safe ([a-zA-Z_])
                                $newTable = preg_replace( '/^' . $old . '/', $new, $table );
                                $this->output( "Renaming table $table to $newTable\n" );
                                $dbw->query( "RENAME TABLE $table TO $newTable" );
                        }
                        $count++;
                }
                $this->output( "Done! [$count tables]\n" );
        }
}

$maintClass = "RenameDbPrefix";
require_once( RUN_MAINTENANCE_IF_MAIN );