Working with "entity-name"

refa · **Posted:** Wed Aug 17, 2005 6:30 am

Hi togehter,

hibernate supports the definition of entity-names for e.g. mapping an object on different tables.

I did it and it works very good by saving objects. I defined several hbm files and gave the same class in different files different entity-name and different table names.

By saving objects, I only need to call saveOrUpdate(ALIAS, object)., where ALIAS is the entity-name depend on the value of an attribute of the object to be saved.

Because instances of the same object are stored in different tables, I need the same machanism by deleting them, but I don't know any way to specify an ALIAS by deleting.

How can I solve the problem?

Thanks,
Reza

max · **Posted:** Wed Aug 17, 2005 9:16 am

session.delete(entityname,object) is there...if not upgrade to later version ;)

refa · **Posted:** Wed Aug 17, 2005 10:08 am

Hi max,

we are using hibernate 3.0.5. It doesn't support session(name, object). The only method for deleting objects supported by session is delete(object) :-(

Any other idea?

finding objects works correctly.

I don't know, how can say hibernate to get correct table by deleting objects.

Regards,
Reza

emmanuel · **Posted:** Wed Aug 17, 2005 10:29 am

You'll have to use Hibernate 3.1beta2

refa · **Posted:** Wed Aug 17, 2005 11:30 am

hi emmanuel,

first thanks for the hint.

I tried it also with hibernate 3.1 b2. It still doesn't work.

Here is the code for deleting objects:

Code:

public class GenericInstrumentDaoImpl extends HibernateDaoSupport {
 public void save(Instrument instrument) {
  if (InstrumentType.BOND.equals(instrument.getInstrumentType())) {
    getHibernateTemplate().saveOrUpdate("BOND", instrument);
  } else if (InstrumentType.WARRANT.equals(instrument.getInstrumentType()))
{
    getHibernateTemplate().saveOrUpdate("WARRANT", instrument);
  } else {
    getHibernateTemplate().saveOrUpdate(instrument);
  }
 }

 public void delete(Instrument instrument) {
  if (InstrumentType.BOND.equals(instrument.getInstrumentType())) {
    getSession().delete("BOND", instrument);
  } else if (InstrumentType.WARRANT.equals(instrument.getInstrumentType()))
{
    getSession().delete("WARRANT", instrument);
  } else {
    getHibernateTemplate().delete(instrument);
  }
 }
}

Saving works well and I don't any trouble with it.

Deleting throws no exception and my unit tests work. But after calling
delete no object is deleted on the database side.

Any idea?

Thanks,
Reza

emmanuel · **Posted:** Wed Aug 17, 2005 11:44 am

Dunno,
transaction?
check org.hibernate.test.typedmanytoone.TypedManyToOneTest.testCreateQuery() to see how your sample differs

refa · **Posted:** Thu Aug 18, 2005 7:46 am

Hi again,

thanks. The problem has been solved.

Reza

emmanuel · **Posted:** Thu Aug 18, 2005 8:51 am

Telling people how you solved it, will help future users like you :-)