Question

I have an object –

 @Entity
 public class myObject{
      public MySecondObject objA;
      public MySecondObject objB;
      ...
 }

I dont have any instance of it but I want to delete all the rows in db that have
fieldA == thirdObj
I have an instance of thirdOBJ but no instance of myobjects.
it is possible to do it with native sql. but than I will need to use the auto assigned id of thirdobj – to compare in the db.
Is there a more elegant way than this?

    try {
        session.beginTransaction();
        session.createQuery("delete from MyObject where fieldA = " +        
                             thirdObject.getID()).executeUpdate();

        session.getTransaction().commit();
        savedSuccessfully = true;
    } catch (HibernateException e) {
        session.getTransaction().rollback();
        savedSuccessfully = false;

    } finally {
        session.close();
    }
    return savedSuccessfully;

Answer 1

It should work with HQL

session
  .createQuery("delete from MyObject where objA = :third")
  .setEntity("third", thirdObject)
  .executeUpdate();

But there are some limits: HQL deletes do not cascade (most) references and do not recognize the real type if there are subclasses. If your class is a simply class, it will work fine.