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

Question

What is the difference between Hibernate Session saveOrUpdate (Object) and merge (Object) methods? Both methods seem to generate SQL INSERT when the given object does not exist in the corresponding table, and UPDATE when it exists.

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Derek mahar Dec 16 '10 at 15:29

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3 answers

jpkrohling · Answer 1 · 2010-12-16T15:31:49+0000

Even if this is for NHibernate, this also applies to Hibernate:

Scott · Answer 2 · 2010-12-16T15:32:46+0000

If I remember correctly, merging occurs for unrelated instances that are not currently managed. It will do an id based search and combine the two.

Derek mahar · Answer 3 · 2011-01-07T17:51:48+0000

Hibernate's SaveOrUpdate and Merge explain the differences between saveOrUpdate() and merge() .