@Database(entities = {Orders.class}, version = 1,exportSchema = false)

private static CacheDatabase INSTANCE;

public abstract OrdersDao ordersDao();

public static CacheDatabase getInMemoryDatabase(Context context) {
    if (INSTANCE == null) {
        INSTANCE =
                Room.databaseBuilder(context.getApplicationContext(), CacheDatabase.class, "CacheDb.sql")
                        .allowMainThreadQueries()
                        .build();
    }
    return INSTANCE;
}

public static void destroyInstance() {
    INSTANCE = null;
}