Hi,
This must be the no. 1 question on the list! :-)
jBoss defaults to commit-option A in standardjboss.xml. Basically this means that
jBoss is supposed to be the only one fooling
around with the datasource. Look in the spec to determine if commit-option B or C is
your preferred choise...
^terp
> -----Oprindelig meddelelse-----
> Fra: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]Pa vegne af Hunter
> Hillegas
> Sendt: 18. april 2001 18:10
> Til: JBoss 2
> Emne: Re: [JBoss-user] Manual database update lost
>
>
> Seems like you're fighting the system a bit. My understanding may be
> incorrect but with CMP, you're telling the system that whatever you have in
> your EJBs needs to be persisted somehow. When it sees the DB out of sync
> with the bean, it updates the DB. That's my guess but I'm sure the EJB
> luminaries will give you more info.
>
> Isn't there a flag to tell Jboss that the datasource is shared (i.e. may be
> updated externally)?
>
> Hunter
>
> > From: "D I Macdonald" <[EMAIL PROTECTED]>
> > Reply-To: [EMAIL PROTECTED]
> > Date: Wed, 18 Apr 2001 16:49:14 +0100
> > To: <[EMAIL PROTECTED]>
> > Subject: [JBoss-user] Manual database update lost
> >
> > Hi there - I have only recently started coding EJBs and have come across the
> > following problem:
> >
> > I have an entity bean, Customer, which has been set to use CMP based on an
> > existing table structure (using jaws.xml and an Oracle DS). Everything works
> > fine - my client app can retrieve and set data exactly as it should.
> >
> > If I run my client and list all the customers (with a certain findBy
> > criteria), I get
> >
> > FIRSTNAME SURNAME IDENTIFIER ADDRESS
> > --------------- ----------------------- ----------
> > ---------
> > Jack Vinegar 61
> > The Hill
> > Jill Vinegar 62
> > The Hill
> >
> > (All this does is use a findByX method - no writes to the db are performed.)
> >
> > I then, via sqlplus, change Jill's surname to be "Brown", commit the change,
> > and do a select statement to confirm that it has actually changed.
> >
> > Finally, I run the client again only to see the same result as that given
> > above. I thought it might simply be a caching issue, but sqlplus shows the
> > data in the DB has actually been altered.
> >
> > So my questions are:
> >
> > a) Is it permissable to have more than one agent altering a table which a
> > CMP Bean uses to store its persistent state ?
> > b) If it is, how can I prevent the bean changing data in the DB (except
> > where a set method is deliberately called) ?
> >
> > I see there is a "read-only" tag that can be set, but ideally I would like
> > to have my bean write data as well (when I *ask* it to).
> >
> > Regards
> >
> > D I Macdonald
> >
> >
> > _______________________________________________
> > JBoss-user mailing list
> > [EMAIL PROTECTED]
> > http://lists.sourceforge.net/lists/listinfo/jboss-user
> >
>
>
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