saveOrUpdate only if necessary

kalstevens · **Joined:** Sat Dec 30, 2006 3:07 pm **Posts:** 16

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Hibernate version:
3.2.6

Mapping documents:
annotations 3.3.0

Name and version of the database you are using:
mysql 5.0

Is there a way to configure hibernate so that a save to the database happens only if it is necessary.

I have a process that retrieves xml data from a third party.
loads an object from the database that may have been previously instantiated.
sets the fields with the new data from the xml file.
and then saves the object.

I assumed that if the object did not change that hibernate would not issue a save to the database, but it does.

Is there a way to configure hibernate so that the save occurs only if one of the fields in the object is different?

Thanks

Kal

Sukirtha · **Posted:** Thu Apr 10, 2008 12:25 am

You could use a manual flush mode for the session. By setting it to manual instead of auto, you can do the fushing whenever you want. If you dont set it to manual, hibernate will automatically save the update state of the object in the session to the database.

Code while getting the session

Code:

Session session = sessionFactory.getCurrentSession();
session.setFlushMode(FlushMode.MANUAL);

Manual flushing while save

Code:

session.save(someObject);
session.flush();