eclipselink merge() without initial SELECT

Question

I am trying to perform a merge(entity) using eclipselink, and I would like to indicate to eclipse if that will be an update or insert, so it does not have to perfor

Answer 1

Thanks to the author of the answer here, the working solution is as follows, keeping track myself of what has gone into the DB, where 'em' is the eclipselink entity manager:

AbstractSession session = ((EntityManagerImpl) em.getDelegate()).getUnitOfWork().getParent();
if (dbObj.getLastModifiedTime().isAfter(lastUpdated))
{
    if (dbObj.isInDB())
    {
        session.updateObject(dbObj);
    }
    else
    {
        session.insertObject(dbObj);
    }
}