How to add object to collection without fetching

homchik · **Joined:** Wed Dec 06, 2006 11:33 am **Posts:** 3

Hibernate version: 3.2.1GA

I have a big collection of elements.
I want to add some element to collection without fetch of all collection.

There is next code:

Code:

  
  tx.begin();
  Parent parent = em.find(Parent.class, 1); // there is in db

  Foo foo = new Foo(1, 2, 3);
  foo.setParent(parent);                   // (1)

  em.merge(foo);

it works but parent_id in db is NULL.
If i add parent.getFoos().add(foo); after (1) lazy collection of foos initializes.

Are the any ideas?

Best regards,
Vadim

alesj · **Posted:** Thu Dec 07, 2006 1:28 pm

Use the inverse attibute in such way that the parent will be the one responsible for the db update.

- http://www.hibernate.org/hib_docs/v3/re ... entinverse

homchik · **Joined:** Wed Dec 06, 2006 11:33 am **Posts:** 3

Thanks for answer!
But how can i tell hibernate entity manager to install inverse="true"? I don't have foo.hmb.xml cose i use ejb-persistence (hibernate-entitymanger). May be there is way to set it with annotations?

I did

Code:

public class Foo {
...
@JoinColumn(insertable=false, updatable=false)
public Parent getParent() {
  return parent
}
...

but it does not work.

Best regards,
Vadim Homchik

alesj · **Posted:** Thu Dec 07, 2006 2:22 pm

Hmmm ... for the annotations I don't know how you setup inverse.
You could read through the HA docs and try to find out. :-)

emmanuel · **Posted:** Thu Dec 07, 2006 3:50 pm

@OneToMany(mappedBy="...")

homchik · **Joined:** Wed Dec 06, 2006 11:33 am **Posts:** 3

emmanuel wrote:

@OneToMany(mappedBy="...")

In that case Foo will be owner of relation, and i can't execute next code:

Code:

  ...
  parent.setFoos(foos);
  parent = em.merge(parent);
  ...

Are there any way to have possibility to save all collection and in some situations to add new foo without getting all collection?

Best regards,
Vadim Homchik

emmanuel · **Posted:** Sun Dec 17, 2006 4:39 pm

I find it inconsistent