Hello All,

I need to do the following and im not quite sure how to do it. I need to retrieve an object from the database using "load", once I have the object I want to detach it from the Session (I tried to use evict, but it didn’t work!), then change its values WITHOUT persisting it with the Database. If the user accepts the changes, I can then persist the object but not before.

Any ideas?

P.S. I also tried to flush and clear the Session but to no avail!

I don't know if calling evict is a requirement for you or not, but what you could do is set this in Hibernate configuration (*.cfg.xml):

<property name="hibernate.connection.autocommit">false</property>

This means your object would not get updated until you explicitely called session.save or something like that. In this case you wouldn't need to call evict - you could just modify the object, and if your user wasn't happy with changes, then simply abandon changes. On the flipside, you'd need to always call session.something to persist your changes.

If you're running in transacted environment, you might also look at those config parameters:
hibernate.transaction.flush_before_completion
hibernate.transaction.auto_close_session

HTH,

Bratek

Sorry, I got confused there for a moment. This is the setting I was thinking of:

session.setFlushMode(FlushMode.NEVER);

This is the one that turns off auto-flush. So even when you close your session your data will not be persisted until you call session.flush();
That way your code can decide when to save and when to skip.

HTH,

Bratek

Thanks for the replay,

I gave that a go, but didnt seem to help.

Any other ideas?

I'm also having the same problem: I need to de-persist an object. If evict doesn't do this, then what is it for? Any help would be absolutely amazing!

Why not just throw it away? Hibernate won't do anything until you "commit" the underlying transaction. If you rollback you can safely throw away eveything.