Object in Session

leetcooper · **Joined:** Tue Sep 23, 2003 7:02 am **Posts:** 16

Hi I am new to hibernate and I am using it to perform a large transaction.

My problem occures when I load the same object in the same session and update the second object. This obviously fails. I was wondering if there was any way of determining if a object is already in session, I need to do this by specifiing a key other the the primary (query maybe). I have looked through the API and there does not seem to be anything obvious on the session interface.

Any help would be appreciated

Thanks Lee

emmanuel · **Posted:** Fri Jan 02, 2004 10:23 am

leetcooper wrote:

I was wondering if there was any way of determining if a object is already in session, I need to do this by specifiing a key other the the primary (query maybe).

No, only session.contains(Object).

rdi · **Posted:** Fri Jan 02, 2004 10:36 am

Je suis un Hibernate newbie, but wouldn't using one of the caching options also address this?

emmanuel · **Posted:** Fri Jan 02, 2004 11:02 am

No, you can't check an object by a non primary key. Actually I can't understand why you need this : if you wnat an object, Hibernta will give it you (from DB or from cache).

What is doable by cache is :
- share object through several sessions
- share HQL queries (and it's underlying objects)

There is no way to query the "session" subset.

You may add this functionality yourself by implementing an appropriate net.sf.hibernate.Interceptor.

Quote:

Je suis un Hibernate newbie

Eheh, I was, and I'm still learning.

leetcooper · **Joined:** Tue Sep 23, 2003 7:02 am **Posts:** 16

Thx for everyones replies....

Ok if there is no way to determine if an object is in session how do I make sure that I evict the object within the same session transaction before I reload it. I have tried evict and this does not seem to work... Should I also flush the session or lock the object ??????.....

Basically I just need a way to perform a large transaction which can handle the possibility of the same object being referenced during the transaction..... Is this an RTFM issue because if it is I would be greatful in someone can point me to a section on how to handle large complex transactions....

thx Lee

emmanuel · **Posted:** Fri Jan 02, 2004 12:10 pm

Code:

if (session.contains(myObject) {
  session.evict(myObject);
}

Evicting an object is not a good way to work. If you can avoid it, then do.