This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Not sure I understand why you need to know if it;s an update or an insert - the Hibernate API can be used transparently for either. A delete you will know about, because your code will have deleted an object.