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Transactions vs plain Flush()

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AleBrozzo

Post subject: Transactions vs plain Flush()

Posted: Fri Apr 07, 2006 2:40 pm

Regular

Joined: Sun Feb 12, 2006 10:18 pm
Posts: 60
Location: Rosario, Argentina

I have an object I need to save after updating it. I wanted to know what is better. This:

Code:

        public static void Save(Entidad o)
        {
            ISession session = factory.OpenSession();
            ITransaction transaction = session.BeginTransaction();
            session.SaveOrUpdate(o);
            transaction.Commit();
            session.Close();
        }

or this:

Code:

        public static void Save(Entidad o)
        {
            ISession session = factory.OpenSession();
            session.SaveOrUpdate(o);
            session.Flush();
            session.Close();
        }

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ewoutkramer

Post subject:

Posted: Mon Apr 10, 2006 6:05 am

Newbie

Joined: Mon Apr 10, 2006 5:21 am
Posts: 2
Location: Amsterdam

Generally speaking, updating the object from within a transaction is preferable, because when a problem occurs, all modifications to the database since starting the transaction would be reverted.

If you are not using a transaction, and a Save or Update generates an exception, any save's that preceded the exception would stay in the database, but the ones that follow would not get through. This would almost surely cause inconsistent data.

Since you do not really know what kind of updates a Save() causes (certainly not with lifecycle objects and cascades) this is actually quite dangerous. So my advice would be: use transactions and read section 10.5 in the Hibernate documentation (version 2.1.7)!

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