Another beginners question

poobeer · **Joined:** Mon Sep 21, 2009 11:57 am **Posts:** 2

Hi there,

when an Object is saved, using saveOrUpdate, how can I find it back if only the new ID is unique? Isnt there any function that automatically returns the new ID instead of 'void'?

thanks,
Klaas

Froestel · **Posted:** Mon Sep 21, 2009 5:38 pm

Hi poobeer,

any new identifier is directly assigned to the object you saveOrUpdate - so if you access the object's getId() (or whatever your method name is in this case) right after calling saveOrUpdate() for the object you get its ID.

If that is not suitable you could implement your own version of saveOrUpdate:

Code:

if (obj.getId() == null) {
  save(obj);
} else {
   update(obj)
}

This will not work if you use assignment generator on your identifier.

CU
Froestel

mephesto · **Joined:** Fri Jan 23, 2009 8:01 pm **Posts:** 13

I use merge() and then the new object's ID is updated in the reference when it's created. So you can just return the TV (or the id) after it's merged.

Code:

IE: 
   public TV storeTV(TV tv) {
      sessionFactory.getCurrentSession().merge(tv);
      return tv;
   }

Keep in mind if you are using spring like me, I saw this note in the petclinic example:

// Note: Hibernate3's merge operation does not reassociate the object
// with the current Hibernate Session. Instead, it will always copy the
// state over to a registered representation of the entity. In case of a
// new entity, it will register a copy as well, but will not update the
// id of the passed-in object. To still update the ids of the original
// objects too, we need to register Spring's
// IdTransferringMergeEventListener on our SessionFactory.

Hope that helps.