GreenDaoUpgradeHelper

To handle database schema changes, extend DaoMaster.OpenHelper and implement the onUpgrade method. Inside onUpgrade, call MigrationHelper.migrate(...) to automate the migration process.

Usage Pattern

1. Create a class extending DaoMaster.OpenHelper.
2. In onUpgrade, call MigrationHelper.migrate.
3. Provide a MigrationHelper.ReCreateAllTableListener implementation that calls DaoMaster.createAllTables and DaoMaster.dropAllTables.
4. Pass all your generated Dao classes as arguments to the migrate method.

To view migration logs during development, set MigrationHelper.DEBUG = true.

public class MySQLiteOpenHelper extends DaoMaster.OpenHelper {
    public MySQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory) {
        super(context, name, factory);
    }

    @Override
    public void onUpgrade(Database db, int oldVersion, int newVersion) {
        // MigrationHelper.DEBUG = true; // Enable to see log info
        MigrationHelper.migrate(db, new MigrationHelper.ReCreateAllTableListener() {
            @Override
            public void onCreateAllTables(Database db, boolean ifNotExists) {
                DaoMaster.createAllTables(db, ifNotExists);
            }
            @Override
            public void onDropAllTables(Database db, boolean ifExists) {
                DaoMaster.dropAllTables(db, ifExists);
            }
        }, TestDataDao.class, TestData2Dao.class, TestData3Dao.class);
    }
}

// Initialization
MySQLiteOpenHelper helper = new MySQLiteOpenHelper(this, "test.db", null);
daoMaster = new DaoMaster(helper.getWritableDatabase());

To handle database upgrades, create a class that extends DaoMaster.OpenHelper and implement the onUpgrade method. Inside onUpgrade, call MigrationHelper.migrate() using a ReCreateAllTableListener. This listener allows you to define how tables are created or dropped during the migration process. You must pass all your DAO classes as arguments to the migrate method.

public class MySQLiteOpenHelper extends DaoMaster.OpenHelper {
    public MySQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory) {
        super(context, name, factory);
    }

    @Override
    public void onUpgrade(Database db, int oldVersion, int newVersion) {
        MigrationHelper.migrate(db, new MigrationHelper.ReCreateAllTableListener() {
            
            @Override
            public void onCreateAllTables(Database db, boolean ifNotExists) {
                DaoMaster.createAllTables(db, ifNotExists);
            }
            
            @Override
            public void onDropAllTables(Database db, boolean ifExists) {
                DaoMaster.dropAllTables(db, ifExists);
            }
        }, TestDataDao.class, TestData2Dao.class, TestData3Dao.class);
    }
}