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Composite Identifier code example please!!

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iamniche

Post subject: Composite Identifier code example please!!

Posted: Tue Jan 31, 2006 7:30 am

Newbie

Joined: Fri Jan 27, 2006 7:52 am
Posts: 3

Hello,

I am looking for example Java code for a composite identifier example - i have the following attempt for creating an object of type CfCustomisation using it's composite key object CfCustomisationId (auto-generated by a Hibernate tool):

Code:

CfCustomisation custom = null;

//customisation uses a composite key
CfCustomisationId cfCustomisationId = new CfCustomisationId(valuePack.getId(), new BigDecimal(Id));

ScrollableResults results = HibernateUtil.getSessionFactory().getCurrentSession().createCriteria(CfCustomisation.class).add( Restrictions.idEq(cfCustomisationId) ).scroll();

if (results!=null)
{
   if (results.first())
      custom = (CfCustomisation)results.get(0);
}
      
if (custom==null)
   custom = new CfCustomisation();

However, I get an error:

Code:

java.lang.ClassCastException: java.lang.String
   at org.hibernate.type.BigDecimalType.getHashCode(BigDecimalType.java:48)
   at org.hibernate.type.AbstractType.getHashCode(AbstractType.java:120)
   at org.hibernate.engine.EntityKey.getHashCode(EntityKey.java:69)
   at org.hibernate.engine.EntityKey.<init>(EntityKey.java:42)
   at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:76)
   at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:889)
   at org.hibernate.impl.SessionImpl.get(SessionImpl.java:826)
   at org.hibernate.impl.SessionImpl.get(SessionImpl.java:819)Name: Customisation1

I have looked at: http://www.hibernate.org/116.html#A23 and yes:
public class CfCustomisationId implements java.io.Serializable

Any further ideas?

Cheerio,
Nic

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iamniche

Post subject:

Posted: Tue Jan 31, 2006 10:49 am

Newbie

Joined: Fri Jan 27, 2006 7:52 am
Posts: 3

I have managed to sort this ClassCastException (the id class was of the wrong type) but still have an issue.

The code works fine if the database is empty, but if there is an existing row in the database I get the following error:

org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update

14:35:48,796 ERROR JDBCExceptionReporter:72 - ORA-01407: cannot update ("ADVISOR"."CF_OC_LIST"."Value_Pack_Id") to NULL

The question is this:
Why is a call to createCriteria().add().list() causing hibernate to do an UPDATE?
Why is the ID null if in the database, the ID field is set?

I think I am missing something obvious!

Any pointers appreciated.

Cheerio,
Nic.

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