array( $this->table_prefix . 'mchat_config' => array( 'COLUMNS' => array( 'config_name' => array('VCHAR', ''), 'config_value' => array('VCHAR', ''), ), 'PRIMARY_KEY' => 'config_name', ), ), ); } public function revert_schema() { return array( 'drop_tables' => array( $this->table_prefix . 'mchat_config', ), ); } }