Schema migrations

If new classes are added, ActiveAndroid will automatically add them to the database. If you want to change something in an existing table however (e.g. add or delete a column), this is done using sql-scripts which can be put in assets/migrations. Whenever your schema (i.e. classes that extend Model) changes you need to

1. increment the database version number, either through Configuration or AA_DB_VERSION meta-data.
2. provide a script <NewVersion>.sql in /assets/migrations.

ActiveAndroid will execute a script if its filename if greater then the old database-version and smaller or equal to the new version.

Let’s assume you added a column colour to the Items table. You now need to increase AA_DB_VERSION to 2 and provide a script 2.sql.

ALTER TABLE Items ADD COLUMN Color INTEGER;