Personally, I would recommend the use of one of OpenJPA's id generators. I've worked with our test organizations that wanted to develop their own id generators and they continue to run into locking and synchronization problems. If you can use the OpenJPA generators, then your application doesn't have to worry about those details. You can worry about more important business logic than assignment of identifiers... :-) With OpenJPA, you have several options for id generation [1].
Good luck, Kevin [1] http://openjpa.apache.org/builds/latest/docs/manual/manual.html#jpa_overview_mapping_sequence http://openjpa.apache.org/builds/latest/docs/manual/manual.html#ref_guide_sequence On Mon, Feb 2, 2009 at 9:28 AM, Miłosz Tylenda <[email protected]> wrote: > Norbert, > > There is no such "standalone" TableGenerator in JPA but some solution to > this has been recently posted here: > > > http://n2.nabble.com/Access-Oracle-Sequence-using-OpenJPA-tp2227943p2227943.html > > Hope this helps. > > Greetings, > Milosz > > > > Hi, > > > > for some reason I need a sequence generator, used to create unique keys > > explicitly. > > > > Is there any kind of "standalone" TableGenerator available in JPA ? > > > > What I want to do is something like that: > > > > "TableGenerator" genId = new "TableGenerator" (em, "XX") ; > > > > Long next = genId.getNext () ; > > > > myEntity.setYY (next) ; // cannot use implicit generated keys. > > > > Thanx a lot for your help. > > > > Norbert > > > > > > > > > > >
