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<?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 bool 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 bool 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();
}