没有命名空间的类 yii yii\base yii\behaviors yii\caching yii\captcha yii\console yii\console\controllers yii\console\widgets yii\data yii\db yii\db\conditions yii\db\cubrid yii\db\cubrid\conditions yii\db\mssql yii\db\mssql\conditions yii\db\mysql yii\db\oci yii\db\oci\conditions yii\db\pgsql yii\db\sqlite yii\db\sqlite\conditions yii\di yii\filters yii\filters\auth yii\grid yii\helpers yii\i18n yii\log yii\mail yii\mutex yii\rbac yii\rest yii\test yii\validators yii\web yii\widgets

Interface yii\db\MigrationInterface

实现yii\db\Migration
可用版本自2.0
源码 https://github.com/yiichina/yii2/blob/api/framework/db/MigrationInterface.php

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.

公共方法

隐藏继承的方法

方法描述被定义在
down() This method contains the logic to be executed when removing this migration. yii\db\MigrationInterface
up() This method contains the logic to be executed when applying this migration. yii\db\MigrationInterface

方法详情

down() 公共 抽象 方法

This method contains the logic to be executed when removing this migration.

The default implementation throws an exception indicating the migration cannot be removed.

public abstract boolean down()
return boolean

Return a false value to indicate the migration fails and should not proceed further. All other return values mean the migration succeeds.

up() 公共 抽象 方法

This method contains the logic to be executed when applying this migration.

public abstract boolean up()
return boolean

Return a false value to indicate the migration fails and should not proceed further. All other return values mean the migration succeeds.