I use Gemstone/J, which has a built-in OODBMS, and I find myself
not needing entity beans at all. I map relational data from oracle
to regular java objects that are stored in the Gemstone persistent
cache (which is what they are calling their ODBMS) and they are accessible
by all session beans. The access to these objects is governed by the same
container managed transactions as relational data access, so you can even
do a 2 phase commit with objects and relational data in the back. (as long
as you have only one data source or a JDBC 2.0/XA compliant driver)
The Entity bean model is totally geared towards relational data stores.
If an entity is a regular java object transactionally shared between all
your sessions, as is the case if you have an OO database, they are totally
useless.
Theoretically ODBMS are the next generation database after relational,
unfortunately a lot of places are just now catching up to relational,
and also, most OO databases can't handle the volume that say an Oracle 8
can.
They also lack tools for manageing the database and reporting.
I would probably not use an OODBMS as my database of record, but in the
mid tier, as an application database and cache, I think it's an excellent
idea.
Frank Sauer
The Technical Resource Connection
Tampa, Fl
http://www.trcinc.com
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]On Behalf Of MOUSSAUD Beno�t
> Sent: Monday, February 28, 2000 4:09 AM
> To: [EMAIL PROTECTED]
> Subject: EJB and ODBMS
>
>
> Is someone has already made a design with an appserver and a ODMS?
> In particular, have you use
> * Only Session bean,
> * Some Entity bean
> * what type of ODBMS ?
> I would like to know what type of problem have you afforded
> and hwo have you
> find a solution
> I think the ODBMS are the next generation of Database (after
> hierachical and
> relationnal) and u ?
>
> Do you think the entity bean model is good for the ODBMS ? is
> it not too
> restrictive vs pure object model (eg. inheritance)
> Can we build an entire design with only odbms and session bean ?
>
> I am ready to open threads about this topic
> Regards,
> Benoit Moussaud
>
> > --
> > Benoit Moussaud - Cril Technology
> > 9/11 rue jeanne braconnier 92360 Meudon la foret FRANCE
> > [EMAIL PROTECTED]
> > www.criltechnology.com
> > tel: (33) 1 40 83 52 52 fax: (33) 1 40 83 52 53
> >
>
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