Question

I have a list of object, for each object I am executing Session.update(), when should I call Session.flush()? After the list complete its iteration or after each update? The code segment is:

public void updateUserAssignmentInfo(final long itemId) {
    getHibernateTemplate().execute(new HibernateCallback() {

        public Object doInHibernate(Session session) throws HibernateException, SQLException {
            session.flush();
            session.setCacheMode(CacheMode.IGNORE);
            List<UserAssignmentInfo> userAssignmentInfos = session.createQuery("from UserAssignmentInfo as userAssignmentInfo where userAssignmentInfo.itemId = " + itemId).list();
            if (userAssignmentInfos.size() == 0) {
                return null;
            }
            for (UserAssignmentInfo userAssignmentInfo : userAssignmentInfos) {
                userAssignmentInfo.setIsCurrentlyAssigned(false);
                session.update(userAssignmentInfo);
                // should I call flush here?
            }
            session.flush(); // or here?
            return null;
        }
    });
}

Answer 1

The latter one.

Also please have a look at:
http://docs.jboss.org/hibernate/core/3.5/reference/en/html/batch.html

Calling session flush at the end will cause that you have higher probability that query will be only soft parsed by database.