On Wed, 10 Nov 2004 21:26:22 +0100, Grzegorz Pypec <[EMAIL PROTECTED]> wrote:
>Hi, > >I have two persistent object in my database: 'film' and 'title'. >The object 'film' has reference to object 'title'. (1:1 relation) > >When I try delete object 'title' in the following way: > ><java> > (...) > tx.begin(); > Film film = getFilm(); > tx.lock(film, Transaction.WRITE); > > Title title = film.getTitle(); > broker.serviceBrokerHelper().unlink(film,"title"); > //tx.checkpoint(); > db.deletePersistent(title); > > tx.commit(); > (...) ></java> > >the following error occur: ><error> > ERROR: SQLException during the execution of the delete (for a >tutor.ojb.odmg.filmoteka.Tytul): > ERROR: update or delete on "title" violates foreign key constraint >"film_fk_1" on "film" ></error> >(First OJB should store the null FK in 'film' then delete object 'title'.) > >But when I uncomment 'tx.checkpoint()' everyfing it's OK!!! However in this >case all changes in transaction are stored in the database and I can't >rollback this changes. >I guess that OJB can't set correct sequence operations when I commit >transaction. > >So, my question is: >how I can set the correct sequence operations in transaction? >Or is there any other method to delete referenced objects? > >regards > >-- >| Grzegorz Pype <gregpyp(at)o2(dot)pl> >| GG# 3744625 >| >| GPG: 21233D71C5C2BD765CF5A69648B26B957FF6CFFE Instead of tx.checkpoint() you can use ((TransactionExt) tx).flush(), which flushes all SQL to the DB without commit. However, normally OJB does a pretty good job in ordering the SQL correctly. Could it be that you have some cyclic references in your object model (e.g. A->B and B->A)? Gerhard --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
