<?php /** * @link http://www.yiiframework.com/ * @copyright Copyright (c) 2008 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yii\db; /** * The MigrationInterface defines the minimum set of methods to be implemented by a database migration. * * Each migration class should provide the [[up()]] method containing the logic for "upgrading" the database * and the [[down()]] method for the "downgrading" logic. * * @author Klimov Paul <klimov@zfort.com> * @since 2.0 */ interface MigrationInterface { /** * This method contains the logic to be executed when applying this migration. * @return boolean return a false value to indicate the migration fails * and should not proceed further. All other return values mean the migration succeeds. */ public function up(); /** * This method contains the logic to be executed when removing this migration. * The default implementation throws an exception indicating the migration cannot be removed. * @return boolean return a false value to indicate the migration fails * and should not proceed further. All other return values mean the migration succeeds. */ public function down(); }