Interface yii\db\MigrationInterface
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.
Public Methods
隐藏继承的方法 Hide inherited methods
方法 Method | 简介 Description | 定义在 Defined By |
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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 Method Details
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. |
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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. |
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