Re: [Springframework-developer] OJB support

[<jue...@we...>]

Brian,
=20
Thanks for your support :-)
=20
If you're interested, check out the current CVS contents. There's pretty =
complete support for the PersistenceBroker API in =
org.springframework.orm.ojb, including a =
PersistenceBrokerTransactionManager which is able to expose the =
underlying JDBC transaction. Furthermore, Petclinic has a fully =
functional OJB data access layer now, as alternative to the existing =
Hibernate and JDBC data access implementations. I've been pretty busy =
since Friday :-)
=20
For the time being, I guess working at the plain PersistenceBroker level =
is good enough. It's actually a distinctive characteristic: In contrast =
to Hibernate and JDO, no change detection occurs, thus also no overhead =
(Hibernate snapshot comparisons) or special setup (JDO bytecode =
post-processing) for it. There's still OJB's full mapping capabilites, =
just with explicit store calls. For many applications, this will be all =
they need, respectively even the level they want to work on!
=20
Juergen
=20

________________________________

Von: spr...@li... im Auftrag =
von Brian McCallister
Gesendet: Mi 07.07.2004 03:12
An: spr...@li...
Betreff: Re: [Springframework-developer] OJB support



Juergen,


Thank you! Now that there are some basics to work from, I'd be happy to
help out =3D)

Getting a connection from a PB instance can be done via
pb.serviceConnectionManager.getConnection();

Also, if you want change detectopm without real object level
transactions, this can be done via a couple fairly simple listeners on
the PB instance (copy-on-read/compare-on-commit). The code for this is
hidden in OJB CVS but is all of maybe 60 lines, I'd be happy to add it
to Spring if anyone wants it.

-Brian

On Jul 2, 2004, at 3:02 PM, j=FCrgen h=F6ller [werk3AT] wrote:

> Hi everybody,
>
> On the occasion of the recent TSS thread on OJB 1.0 final, I've
> decided to give OJB PersistenceBroker integration a go. I've already
> committed the initial bunch a couple of hours ago, providing
> PersistenceBrokerTemplate, PersistenceBrokerTransactionManager, etc.
>
> This initial stuff took just about 4 hours, including getting OJB to
> work with a simple example! I was pleasantly surprised by how easy OJB
> is to set up. I'm not fond really fond of its static initializer
> model, but it does work and is simple enough to get going.
>
> I'm currently working on support for exposing the JDBC Connection in
> PersistenceBrokerTransactionManager and other refinements. I plan to
> add a Petclinic data access version for OJB this weekend: As far as I
> can judge at this point of time, this should be simple enough to do.
>
> One of the distinct characteristics of OJB's PersistenceBroker is that
> it offers all of OJB's mapping and querying capabilities, but does not
> attempt to provide object-level transactions, i.e. does not do
> automatic change detection but rather rely on explicit store calls.
> For Petclinic-style web apps, this is more than enough.
>
> The stuff in CVS does work already, so whoever's interested, feel free
> to have a look at it :-)
>
> Juergen
>
>
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