Hi Gareth, The ID stuff is "legacy" I hope to get it eliminitaed sooner or later...
cheers, Thomas > -----Urspr�ngliche Nachricht----- > Von: Gareth Cronin [mailto:GarethC@;kiwiplan.co.nz] > Gesendet: Mittwoch, 30. Oktober 2002 00:00 > An: OJB Users List (E-mail) > Betreff: Nasty gotcha with non-sequential field-descriptor ids > > > I saw a post a while back querying the necessity of > completely sequential > field-descriptor ids... I just found out the hard way what > happens if they > are non-sequential. I generate my repository.xml from a > Rational Rose model > and so the ids are assigned to field-descriptors as the model > is parsed. For > the next available field-descriptor id, I was just taking the > next value > beyond the current maximum for a given class-descriptor - > this was leaving > some "holes", e.g. I'd have field descriptors numbered 1, 2, > 4, 5. This > didn't cause any problems... until... > > When I saved a new class with a cascade-update collection, > OJB would assign > the same primary key ID to every member of the collection and > save every > member of the collection as though it was the same object. > Therefore, I'd > end up with one row in a database table instead of 10, with > the values of > the row reflecting the last member of the collection that was saved. > > I've now changed the code generator to fill in the holes in > the numbering. > But I do wonder, is this behaviour really desirable? Will the > ids be ditched > at some point? > > Thanks > > Gareth. > > ----------------------------------------------------------- > Gareth Cronin > Analyst/Programmer > Kiwiplan NZ Ltd, Auckland, New Zealand > Ph 64 9 2727622 x854 > ----------------------------------------------------------- > > -- > To unsubscribe, e-mail: <mailto:ojb-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:ojb-user-help@;jakarta.apache.org> -- To unsubscribe, e-mail: <mailto:ojb-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:ojb-user-help@;jakarta.apache.org>
