On Tue, 04 Jan 2005 23:37:20 +0900, Carlos Villegas <[EMAIL PROTECTED]> wrote: > Oliver Zeigermann wrote: > > OK, I will remove the author tags then. Concerning DAO, I was talking > > about the general concept, while you seem to think about the Spring > > implementation. Is that right? > > > > Well I was just saying that in this imperfect world you can't just map > any object to a relational model. Comming from EJBs and entity beans you > are taught to keep your persistence (entity/peer) classes simple, simple > serializable java beans. Just binding your java beans properties to
Any idea why the java beans should be serializable? > fields in database tables. This way you can query your persistence > classes in the same way with some abstracted SQL that eventually gets > mapped to native SQL. But this way you still have to do abstraction > mapping at the java level, between your domain objects and your entity > classes. That's the approach I've taken, which is pretty standard, used > in EJB and OJB. I haven't really explored DAO, ODMG or Spring so maybe > these frameworks have less limitations in this respect and you can go > closer to your domain objects. My first purpose with OJB was to remove > database dependencies as much as possible. Let OJB take care of the > database differences, that's all at this point. We can explore later the > possibilities of using these frameworks in Slide in a cleaner design. If I get this right, we could extract some code parts that simply map peer to Slide classes and have other parts that do the peer / OJB and possible peer / something-else mapping?! > > Anyway, this is our TODO-List, right? > > - Content support > > - Native Sequence support > > - Compatibility with the old scheme (maybe using a migration tool) > > - Think about mapping > > > > Yes. That's it so far. I have created http://wiki.apache.org/jakarta-slide/OjbStore which I propose is the development Wiki page for the OJB store. Initially it contains the above TODO-List. Oliver --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
