Just to put my 2 cents...
Even in JDO same thing happening. I got frustrated first but then i
just accepted it/ignored it(5-6 months back)...that may be they wont
fix it or they are not able to do it on GAE... But yes you are right
frameworks like Hibernate does provide key as soon as you call the
persist/save method and doesn't wait for commit call.
And i hope datanucleus(id) is not the official representative of Data
Nucleus framework/company, and if that is the case then it is sad that
such harsh reply are coming from official representative. I have never
seen such reply from google guys, we ask so basic/absurd/stupid/naive
questions all the time and they always reply politely and definitely
don't end the discussion with END.
Ravi.
On May 19, 7:06 am, Luca <luca.mas...@gmail.com> wrote:
> End ???? Very kind from you !! And you haven't asked twice.
>
> Anyway I will be back on the main argument that is the fact that I
> think DataNucleus is not working like all other JPA engines.
>
> Those lines you reports only says that flush synchronize the state to
> the underling database, nothing strange on that, is the behaviour I
> expect. And regarding the "footnote" I think that this is a very
> subtle case.
>
> I'm talking about a simple code like
>
> tx.begin();
>
> Luogo luogo = new Luogo();
> luogo.setDescrizione("Ulisse Dini");
> em.persist(luogo);
>
> System.out.println("Luogo Key: "+luogo.getKey());
>
> tx.commit();
>
> there "null" will be printed only by DataNucleus, so that I have to
> design my code in a way specific to that persistence provider. If this
> is what you desire, well, you are sure in the right way.
>
> And also notice that the reference implementation (EclipseLink) works
> the way I expect, so please take a look at it.
>
> On May 19, 7:26 am, datanucleus <andy_jeffer...@yahoo.com> wrote:
>
>
>
>
>
> > I've already asked you twice to post your class. You haven't. That
> > provides no context for any comment, and I've already told you why
> > datastore operations are delayed until commit/flush. Why do you think
> > there's a flush() method if you think things ought to go straight to
> > the datastore ?
>
> > JPA2 spec page 29 footnote 12.
> > <spec>[12] If the application does not set the primary key attribute
> > corresponding to the relationship, the value of that attribute may not
> > be available until after the entity has been flushed to the database.</
> > spec>
>
> > <spec>/**
> > * Synchronize the persistence context to the underlying database.
> > * @throws PersistenceException if the flush fails
> > */
> > public void flush();</spec>
>
> > <spec>• If X is a new entity, it becomes managed. The entity X will be
> > entered into the database at or
> > before transaction commit or as a result of the flush operation.</
> > spec>
>
> >http://www.datanucleus.org/products/accessplatform/jpa/transaction_ty...
>
> > End.
>
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