I have been playing around this in a web context, and what I am
finding with a user created Transaction, if the DataContext commits
the changes, unless the Transaction explicitly performs a rollback the
changes will be committed to the database.
This is not what I was expecting, but I am wondering if this is an
artifact of the thread pool, ie maybe the same thread is coming back
of the pool.
regards Malcolm Edgar
On Tue, Feb 19, 2008 at 8:31 PM, Malcolm Edgar <malcolm.edga..mail.com> wrote:
> Great! Thanks for that.
>
> regards Malcolm Edgar
>
>
>
> On Feb 19, 2008 11:18 AM, Andrus Adamchik <andru..bjectstyle.org> wrote:
> > Just use your own transactions, then 'commitChanges' turns into 'flush':
> >
> > http://cayenne.apache.org/doc/understanding-transactions.html
> >
> > Andrus
> >
> >
> > On Feb 18, 2008, at 7:49 AM, Malcolm Edgar wrote:
> >
> > > Hi Ari,
> > >
> > > thanks for the response. This would be a very good 3.0 feature if it
> > > is not already present.
> > >
> > > In Hibernate this functionality is performed as a flush operation,
> > > where CRUD operations are performed against the transaction but are
> > > not actually committed.
> > >
> > > Would this would cause issues with Cayenne PK generation strategy, are
> > > the highest/last table id values they maintained in memory?
> > >
> > > regards Malcolm Edgar
> > >
> > > On Feb 18, 2008 3:16 PM, Aristedes Maniatis <ar..sh.com.au> wrote:
> > >>
> > >> On 18/02/2008, at 2:07 PM, Malcolm Edgar wrote:
> > >>
> > >>> Is there a way in Cayenne, possibly using Transactions, that we can
> > >>> perform this import, do inserts and queries against the transaction
> > >>> and only commit/rollback at the end?
> > >>
> > >> Subclass the Cayenne context, override performQuery and add in your
> > >> own custom code there to look for new objects within the context?
> > >> There is almost certainly a way to have a database transaction cross
> > >> several Cayenne commits as well, but I can't assist there.
> > >>
> > >> In fact we've done this several times in our application and I was
> > >> just thinking the other day whether this might be an option in a new
> > >> generified performQuery and might be useful to be pushed into
> > >> Cayenne.
> > >>
> > >>
> > >> Ari Maniatis
> > >>
> > >>
> > >> -------------------------->
> > >> ish
> > >> http://www.ish.com.au
> > >> Level 1, 30 Wilson Street Newtown 2042 Australia
> > >> phone +61 2 9550 5001 fax +61 2 9550 4001
> > >> GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
> > >>
> > >>
> > >>
> > >
> >
> >
>
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