@Dao

 public abstract class ProductDao {

    @Insert

    public abstract void insert(Product product);

​

    @Delete

    public abstract void delete(Product product);

​

    @Transaction

    public void insertAndDeleteInTransaction(Product newProduct, Product oldProduct) {

         // Anything inside this method runs in a single transaction.

         insert(newProduct);

         delete(oldProduct);

     }

 }