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save() doesn't return id

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zorglub76

Post subject: save() doesn't return id

Posted: Thu Dec 14, 2006 12:02 pm

Newbie

Joined: Thu Dec 14, 2006 9:42 am
Posts: 2

For some reason I don't get the id (primary key) of the object saved with session.save(object).... I have the following:

Code:

<id name="udetId" type="int">
  <column name="udet_id" />
  <generator class="assigned" />
</id>

and:

Code:

Session sess = HibernateUtil.getSessionFactory().getCurrentSession();
sess.beginTransaction();

UserDetail ud = new UserDetail();
ud.setUdetName("Asdf");
ud.setUdetSurname("Asdfasdf");
ud.setUdetMail("asdf@asdf.com");

java.io.Serializable udId = sess.save(ud);
sess.getTransaction().commit();

When I later print the value of udId, it comes out to be 0.
Any ideas?

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dsiefert

Post subject: generator class='assigned'

Posted: Thu Dec 14, 2006 12:07 pm

Newbie

Joined: Wed Dec 06, 2006 6:30 pm
Posts: 8

You have specified that you will assign the id (see <generator .../> mapping). You need to set the id before you save it.

In fact, if you do not specify a generator then the default is 'assigned'. Therefore your mapping could be simplified to:

Code:

-David

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zorglub76

Post subject:

Posted: Fri Dec 15, 2006 4:48 am

Newbie

Joined: Thu Dec 14, 2006 9:42 am
Posts: 2

Arrgh!
Thanks a lot! The problem was so annoying.. I thought that using this generator and save() function the workflow looks like this:

1. Hibernate generates the object,
2. asks db for the id to use,
3. saves the object into db,
4. returns the used id

So I thought that the error lies in my usage of the object, not in mapping..
Anyway, I used

Code:

and now everything works fine.

Thanx again!

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