hai,

i have doubt in rollback concept.pls clear my doubt.

first i saved the data in the session, then i rollback again, sothat the data are not stored permenently in the database. its workking fine.

but my question is the data are not rollback in the class ie(User class).

when i print the last inserted id from the class, it print last inserted id, but that id not present in the database. bcz it already rollback. so how to rollback in the class also



see the code for clear description


User user = new User();
user.setFirstname((String)addContactForm.getFirstname());
user.setLastname((String)addContactForm.getLastname());
user.setEmail((String)addContactForm.getEmail());
session.save(user);

session.getTransaction().rollback();
System.out.println(" last inserted id"+user.getId()); // from user class.

It must have something to do with your database. IDs can not be rolled back since most of them are sequential. So lets say you use n and you want to revert back. However, n+1...n+m might have been used in this while and it is not a trivial task to put n in queue for the next id generation and make sure the one after n is n+m+1. You will have to implement your own id generation mechanism if you want this to work but it will be quite complicated. That's what I think though.


Farzad-

Hi,
>> when i print the last inserted id from the class, it print last inserted id, but that id not present in the database. bcz it already rollback.

That row never got inserted in first place.
Identifier is fetched on save ( session.save(user))
The row gets inserted only on a flush. (directly or otherwise, say through commit )
Database transaction rollbacks do not rollback sequence fetches.

>> so how to rollback in the class also
Hibernate Models are POJOs. They can be ( and are often ) used seamlessly with other classes and objects.
So, it's fair on Hibernate's part not to reset the entries in our POJO.

---------------------------------------------
Rate the reply if you find it helpful

pramodkp wrote;


Hibernate Models are POJOs. They can be ( and are often ) used seamlessly with other classes and objects.
So, it's fair on Hibernate's part not to reset the entries in our POJO.


reply from pearlkumar



if any other way to reset the values in the POJOs. or Not possible to reset in the POJOs.

Thanks