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
| Method | Description | Defined By |
|---|---|---|
| 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 |
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. |
|---|---|---|
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. |
|---|---|---|