On Thursday 25 June 2009 16:27:20 Daryl Stultz wrote: > On Wed, Jun 24, 2009 at 4:22 PM, Roger <[email protected]> wrote: > > is there a way > > through the "enhanced" version to detect which entities have been changed > > so I > > don't call persist() for them, > > Well, since no one else has replied, I might be able to help. Try this: > OpenJPAEntityManager openJpaEm = (OpenJPAEntityManager) em; > assertTrue(openJpaEm.isDirty(entity)); >
Is it ok to do that? Shouldn't I be working through the generic Persistence API rather than "tying" myself to the specific implementation? > > or do I persist() them all and trust openJpa to > > only physically persist entities that have changed? > > First I assume you mean merge() rather than persist() as persist() is > something you do with new entities. > I am more of a newbie than I thought then. I thought merge() was something that you did when you had a "disconnected entity. Are there any good tutorials online anywhere for beginners - I find the openjpa manual a bit turgid and assumes that I know more about things than I actually do Regards
