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session.save flush the data although FlushMode.COMMIT

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HLHLHL

Post subject: session.save flush the data although FlushMode.COMMIT

Posted: Tue Dec 11, 2012 4:43 am

Newbie

Joined: Wed Jan 30, 2008 9:27 am
Posts: 3

Hello,

I'm using hibernate 3.6 to control all the DB transactions with MSSQL 2008.

I have the following code:

Code:

Session session = sessionFactory.getCurrentSession();

session.setFlushMode(FlushMode.COMMIT);

Transaction tx = session.beginTransaction();

User u = new User();

session.save(u);

Thread.sleep(10000);

tx.commit();

Why does hibernate flush the new user before tx.commit()? I know this because when I do select * from table the table is lock until tx.commit().

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pb00067

Post subject: Re: session.save flush the data although FlushMode.COMMIT

Posted: Tue Dec 11, 2012 7:29 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

There are some situation where hibernate is forced to flush implicitly, i.e. when you do operations on EXTRA_LAZY collections.
In your case I guess it's because you are using native (AUTO) identifier-generation strategy for User entity,
where session.save(u) in order to obtain a definitive id for that user, is forced to do the insert immediately.
Aren't you using native (AUTO) identifier-generation strategy for User entity?

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HLHLHL

Post subject: Re: session.save flush the data although FlushMode.COMMIT

Posted: Tue Dec 11, 2012 8:16 am

Newbie

Joined: Wed Jan 30, 2008 9:27 am
Posts: 3

Yeah you are right.

The solution that we implemented here is to setup the isolation level to 1 (TRANSACTION_READ_UNCOMMITTED) by declaring in the hibernate.cfg.xml file:

<property name="hibernate.connection.isolation">1</property>

I may use the MSSQL "READ_COMMITTED_SNAPSHOT" isolation level, I need to read more about it.

Thank you very much

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