[jboss-user] [EJB 3.0] - Re: Force update on particular column

[mazz@jboss.com]

"CMP Entity Bean"?  Is this a EJB 2.x question or a EJB3/JPA entity question?  I'll assume the latter due to this forum being "EJB 3.0".

See entityManager.merge() - it merges an unattached JPA entity bean meaning whatever values are in the bean will be put into the DB. It doesn't merge one particular field - the entire bean is merged.  I don't know of a way to force only a single field (dirty or not) to be merged into the DB - I don't think its possible, short of you writing your own JPQL UPDATE query and executing that explicitly.


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