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From "Malcolm Edgar" <malcolm.ed...@gmail.com>
Subject Re: Imports
Date Sat, 08 Mar 2008 03:53:03 GMT
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.edgar@gmail.com> wrote:
> Great! Thanks for that.
>
>  regards Malcolm Edgar
>
>
>
>  On Feb 19, 2008 11:18 AM, Andrus Adamchik <andrus@objectstyle.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 <ari@ish.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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