session.load(Object o, Serializable s)

gimi · **Joined:** Thu Dec 04, 2003 3:45 pm **Posts:** 9

Hello,

My table has a composed-id (a compozed primary key)!
My class has a method load(Long pk1, Long pk2) and I wanted to load this object, but I didn't find any way, hot to give a compozed id! Anyone any idea?

here my code:

Code:

   public void load(Long id1, Long id2) {
      Session session = null;
      AsyncRequest newObj = null;

      try {
         session = HibernateFactory.getSessionFactory().openSession();
     
         session.load(this, new Object[] { id1, id2 });// <-- HERE is the problem
      } catch (HibernateException e) {
         e.printStackTrace();
      } finally {
         try {
            session.close();
         } catch (HibernateException e) {}
      }
   }

I tried this way, but it doesn't work!!
Hope anyone can help me

Thanx in advance,
gimi

dimas · **Posted:** Thu Dec 04, 2003 5:08 pm

I have never worked with composite-id so my question may seem idiotic :)

According to documentation, you have to specify class for <composite-id> element. Right? So you have to have special ID class. Why can't you just create an istance of this class, set both of its ID properties and use THIS instace as id in session.load? Doesn't it work?

I means something like

Code:

  MyId id = new MyId();
  id.setA(new Long(1));
  id.setB(new Long(2));

  session.load(id);

emmanuel · **Posted:** Thu Dec 04, 2003 6:43 pm

As dimas said
map you composite-id on a serializable class representig you composite id (see doc on this subject, equals and hashCode must be overriden)

Then use load(Object, Serializable).

If you don't want that, then do a plain HQL query .

gimi · **Joined:** Thu Dec 04, 2003 3:45 pm **Posts:** 9

epbernard wrote:

As dimas said
map you composite-id on a serializable class representig you composite id (see doc on this subject, equals and hashCode must be overriden)

Then use load(Object, Serializable).

If you don't want that, then do a plain HQL query .

The problem is solved! I created a new class for the PrimaryKey and it worked fine! The only thing maybe is, that first I tried to create a inner-class, but i got an error the class needs an empty constructor or something like this, although there was the constructor! The same class was correct as non inner-class!

Is this a bug??

anyway, thank you very much for your help

gimi

dimas · **Posted:** Fri Dec 05, 2003 12:43 pm

I think inner class didn't work because you forget to make it "static" and that means it need to know reference to "outer" class instace (and this reference is passed to the constructor and that is why your 0-parameters constructor become 1-parameter constructor)

emmanuel · **Posted:** Fri Dec 05, 2003 12:44 pm

You need static inner class

gimi · **Joined:** Thu Dec 04, 2003 3:45 pm **Posts:** 9

Ups..

Didn't read carefully :-)
now it worked with inner class just great.. thanx

gimi