Force insert on persistent object

foster · **Joined:** Mon Nov 28, 2005 2:35 pm **Posts:** 14

Hi!

I have one object, which I want to insert twice into the same table.
This is requiered for keeping a history.
The inserts should happen within in the same transaction.
And look something like

Code:

...
session = HibernateUtil.currentSession();
transaction = session.beginTransaction();
TObject o = new TObject();
....
session.save(o);
o.setValue(v);
session.save(o);
transaction.commit();
...
finally{
session.close();
}

Unfortunately Hibernate thinks, that it has to perform an UPDATE on the second time calling session.save(o) and does not insert o again. These
seems to make session.update and session.saveOrUpdate redundant.

In a second try I have tried to clone o and then save the clone, but with the same result. Who can help?

thx in advance[/code]

urs_b · **Posted:** Wed Jan 04, 2006 10:11 am

Check your equals() method of TObject.
Does it take the value you passed with setValue(v) into account?
Do you have an id property?
What is your primary key on the table?

Read:
http://www.hibernate.org/hib_docs/v3/reference/en/html/objectstate.html

Urs

LaLiLuna · **Posted:** Wed Jan 04, 2006 10:37 am

Once you saved your object it is in the persistant state (as mentioned by urs_b read the reference here).

You cannot change the primary key of an object in this state as long it is connected to a session.
So your choice is
a)
close session -> change primary key -> save
which I do not recommend
b)
make a copy of your object (not including the primary key of course)
which is a viable solution
c)
work with timestamps -> read about versioning in the manual

Regards

Sebastian

foster · **Joined:** Mon Nov 28, 2005 2:35 pm **Posts:** 14

Thx for your help. Thanks to your clues I was able to solve the problem.