What are the differences between Hibernate Session methods saveOrUpdate() and merge()?

Question

What are the differences between Hibernate Session methods saveOrUpdate(Object) and merge(Object) ? It seems that both methods generate an SQL INSERT statement when the given object does not exist in the corresponding table and an UPDATE when it does exist.

Answer 1

Even though this is for NHibernate, it also applies to Hibernate:

NHibernate - Difference between session.Merge and session.SaveOrUpdate?

Answer 2

If I remember correctly, merge is for un-associated instances, that aren't currently managed. It will do a lookup based on id and merge the two.

Answer 3

SaveOrUpdate与Hibernate中的Merge解释了saveOrUpdate()和merge()之间的区别。