Yii2 Database Migrations

When to use

• The user needs to apply or revert Yii2 migrations through the yii migrate console command.
• The user wants to create a Yii2 migration class to change the database schema.
• The user is implementing a Yii2 migration safeUp and safeDown so the schema change can be rolled back.

When NOT to use

• Do not run ad hoc ALTER TABLE statements directly against a shared database instead of writing a migration.
• Do not use migrations to load large volumes of application data that belongs in a seeder or fixture.

Core guidance