| Implemented by | yii\db\Migration, yii\mongodb\Migration |
|---|---|
| Available since version | 2.0 |
| Source Code | https://github.com/yiisoft/yii2/blob/master/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.
| 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 |
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. |
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Licensed under the three clause BSD license.
http://www.yiiframework.com/doc-2.0/yii-db-migrationinterface.html