Hi folks.

What happens when object is loaded in one session, not being modified in web tier (user just pressed Submit without changing any field value), and updated using Session.saveOrUpdate() in another session? Can Hibernate somehow know that object hasn't been change thus never issue UPDATE sql command?
Looking at "net.sf.hibernate.SQL" log category, I can see that UPDATE sql is executed :-(
Same thing is when only one field is changed, and Hibernate seems to execute UDPATE stetement with *all* fields included?!

Or maybe Im missing something to set it properly?

Thanx,
Vjeran

It's not possible for Hibernate to know the previous state of your object unless you either keep it associated with the session or use select-before-update=true

how can i bind a session to an object, so if i save the object in another session, only the changed objects are saved?
Only a general explanation to do this is needed, a small example is also fine.

Just keep the session open and reuse it

yes, this is a solution, but i'm working with spring/hibernate.
there that is i think another way, because the hibernatetemplate is managing that.

Well, I know how to do it with Hibernate - probably ask the Spring guys if they know how to do it with Spring