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how to obtain the key of a bean ?

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mirak

Post subject: how to obtain the key of a bean ?

Posted: Wed Mar 27, 2013 12:34 pm

Beginner

Joined: Mon Apr 04, 2011 12:08 pm
Posts: 32

My bean keys are notated either with @Id, @EmbeddedId or @IdClass

I have a bean just created by the user but not yet presisted.
I would like to know before inserting or updating if the bean exist or not.

So I have to do a find(bean.class,beanPk)

so I could create beanPk dynamically by scanning the @Id @EmbeddedId or @IdClass on the bean
I could also save and catch the exception comming from the database

But wouldn't it make sens that hibernate provide a method that just return a beanPk ?

Last edited by mirak on Thu Mar 28, 2013 5:11 am, edited 1 time in total.

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mirak

Post subject: how to obtain the key of a bean ?

Posted: Wed Mar 27, 2013 1:12 pm

Beginner

Joined: Mon Apr 04, 2011 12:08 pm
Posts: 32

I found an ugly and dangerous way to do it
just to prove that hibernate has the tools to do it

Code:

Session currentSession = getHibernateTemplate().getSessionFactory().getCurrentSession();
currentSession.buildLockRequest(LockOptions.NONE).lock(bean);
final Serializable identifier =   currentSession.getIdentifier(bean);
currentSession.evict(bean);
return getHibernateTemplate().get(bean.getClass(), (Serializable) identifier) != null;

without the evict, hibernate returns the just attached instance from the session

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