Hi,
Since the nature of the type mapping isn't specified much in the spec, I
don't see how implementing this in jaws would be not spec compliant,
although it would be non portable to other app servers. I understand why
you would want to do this in the bean. I for one would like to see the
jaws code in whatever state you take it to.
I think an eventual goal must be to make jaws more modular. There are
several ideas that seem database specific (such as the stable rowid stuff),
and I think it might be good to have optional abilities to do things like
--use a jca resource.cci.connection with interactionspecs instead of jdbc
--use stored procedures for insert, update, delete instead of semi-dynamic
sql.
david jencks
On 2001.06.09 09:52:32 -0400 Vincent Harcq wrote:
> Well,
> I think it is not spec compliant because this fetaure is not supported by
> other appservers. For them I will have to serialize my object to the
> database. An my original problem was that if the version (serialization
> speaking) of this object change, I may have problem with old records in
> the
> database. Then if I implement a jboss specific feature and abuse of it,
> I
> will have to find another trick if I want to deploy my application on
> another ejb server.
> That said, I have the trick for these other appserver(explained in last
> mail) so if you think JBoss could gain by imlementing such a feature, I
> am
> still ready to implement it.
> In fact I have almost finish programming it.
>
> BTW, I was also thinking about a XML-Jaws that could use JAXB to store
> entity beans in XML databases. Just an idea, I have not really think
> about
> it.
>
> Vincent.
>
>
> > -----Message d'origine-----
> > De : [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]De la part de
> > David Jencks
> > Envoyé : samedi 9 juin 2001 15:30
> > À : [EMAIL PROTECTED]
> > Objet : RE: [JBoss-dev] CMP fields XML Serialization
> >
> >
> > Hi,
> > I thought you had a great idea. I'm very curious about why this was a
> bad
> > idea and how it is not spec compliant.
> >
> > Thanks
> > david jencks
> >
> > On 2001.06.09 03:52:17 -0400 Vincent Harcq wrote:
> > > Forget it.
> > > I find it more spec compliant to have a String cmp field containing
> my
> > > XML
> > > respresentation.
> > > a getter method that do XML-->Object
> > > a setter method that do Object-->XML
> > >
> > > Anyway, make the storage of cmp field to db field in Jaws is not
> > > difficult
> > > but finally I don't think it's a good idea.
> > >
> > > Vincent.
> > > > -----Message d'origine-----
> > > > De : [EMAIL PROTECTED]
> > > > [mailto:[EMAIL PROTECTED]]De la part de
> > > > Vincent Harcq
> > > > Envoyé : vendredi 8 juin 2001 17:47
> > > > À : [EMAIL PROTECTED]
> > > > Objet : RE: [JBoss-dev] CMP fields XML Serialization
> > > >
> > > >
> > > > Hi,
> > > > I will look at this idea, by having a new jdbc-type in jaws.xml for
> > > which
> > > > parameters can be set that tells Jaws how to insert/retrieve
> > > > attribute/field.
> > > > But I still want to keep it simple and keep the constraint one cmp
> > > field /
> > > > one database field.
> > > > Regards.
> > > > Vincent.
> > > >
> > > > > -----Message d'origine-----
> > > > > De : [EMAIL PROTECTED]
> > > > > [mailto:[EMAIL PROTECTED]]De la part
> de
> > > Bill
> > > > > Burke
> > > > > Envoyé : vendredi 8 juin 2001 16:51
> > > > > À : [EMAIL PROTECTED]
> > > > > Objet : RE: [JBoss-dev] CMP fields XML Serialization
> > > > >
> > > > >
> > > > > Can you plug-in how a CMP field is stored in the database? If
> not,
> > > this
> > > > > would be the best first step.
> > > > >
> > > > > Bill
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: [EMAIL PROTECTED]
> > > > > > [mailto:[EMAIL PROTECTED]]On Behalf
> Of
> > > > > > Vincent Harcq
> > > > > > Sent: Friday, June 08, 2001 3:23 AM
> > > > > > To: Dev JBoss
> > > > > > Subject: [JBoss-dev] CMP fields XML Serialization
> > > > > >
> > > > > >
> > > > > > Hi,
> > > > > > In CMP Entity beans, fields that can not be mapped automaticaly
> > > > > > to primitive
> > > > > > SQL type are
> > > > > > serialized and saved as Object in the database. One problem is
> > > > > > then if you
> > > > > > want to change the Object, you have to take care of
> Serialization
> > > > > > versions,...
> > > > > > everything is not possible here. Another problem is if you
> > > > want to give
> > > > > > access
> > > > > > to your db to a non Java world.
> > > > > > One solution for that could be to XMLize the object to a
> > > > VARCHAR/String
> > > > > > format.
> > > > > > The power on changes of the Object will be more powerfull by
> > > > > > implementation
> > > > > > of
> > > > > > method like "importXML" and "exportXML".
> > > > > >
> > > > > > What do you think of a feature like that ?
> > > > > >
> > > > > > What I try to avoidby using that is BMP , TopLink/Castor,
> > > XML/Object
> > > > > > Databases.
> > > > > >
> > > > > > Vincent.
> > > > > >
> > > > > >
> > > > > > _______________________________________________
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> > > > >
> > > > >
> > > > >
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