Updating persistent property in PreInsertEventListener

tpischke · **Posted:** Wed Mar 30, 2005 10:41 am

Hibernate version: 3.0

Name and version of the database you are using: FirstSQL 3.0

I'm experimenting with the PreInsertEventListener.
Although the code below gets executed correctly and the dataHash property is properly updated, the updated value is not written to disk, and the dataHash property remains null in the db record corresponding to the Thingy.

Should it be possible to modify entity values prior to insert/update? If so, why might the updated dataHash property fail to be written?

Code:

public class SBPreInsertListener extends DefaultPreInsertEventListener {

    public SBPreInsertListener() {
    }

    public boolean onPreInsert(PreInsertEvent event) {
        if (event.getEntity() instanceof Thingy) {
            final Thingy thingy = (Thingy) event.getEntity();
            thingy.setDataHash(thingy.getThingyData().save());
        }
        return super.onPreInsert(event);
    }
}

tpischke · **Posted:** Wed Mar 30, 2005 11:28 am

Code:

public class SBSaveOrUpdateListener extends DefaultSaveOrUpdateEventListener {

    public SBSaveOrUpdateListener() {
    }

    public Serializable onSaveOrUpdate(SaveOrUpdateEvent event) throws HibernateException {
        if (event.getObject() instanceof Thingy) {
            final Thingy thingy = (Thingy) event.getObject();
            thingy.setDataHash(thingy.getThingyData().save());
        }
        return super.onSaveOrUpdate(event);
    }

}

harshalx · **Posted:** Fri Jan 25, 2008 2:51 am

Even I have experimented with PreInsertListener and found that the changes on the entity do not persist. Please avoid using this.

cw1057 · **Joined:** Mon Jan 15, 2007 4:05 am **Posts:** 2

Inspired by org.hibernate.EmptyInterceptor!

Code:

public boolean onPreInsert(PreInsertEvent event) {
   event.getState()[ArrayUtils.indexOf(event.getPersister().getPropertyNames(), "createDate")] = new Date();
   return false;
}

ARadauer · **Joined:** Wed Mar 11, 2009 5:13 pm **Posts:** 4

ok,
thank you. your solution is working...
but why?