Android Room transactions across DAOs

Question

The official documentation states that:

It is recommended to have multiple Dao classes in your codebase depending on the tables they touch. 

and that one can mark a method with the Transaction annotation like that:

 @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);      }  } 

But what if a transaction spans multiple DAOs? Should I merge all DAOs into one just to support transactions, or there's a better way to do that?

Answer 1

You can use RoomDatabase.runInTransaction(...)

Something like:

database.runInTransaction(new Runnable(){   @Override   public void run(){     Access all your daos here   } });