Thanks Alexis for this info..:) Regards Jeff
On Wed, Dec 9, 2009 at 9:22 AM, Alexis Midon <[email protected]> wrote: > MemDao are defintely not an implementation for testing. > They are used for In-memory processes: > http://ode.apache.org/user-guide.html#UserGuide-Inmemoryexecution > > > > On Mon, Nov 16, 2009 at 12:03 AM, Jeff Yu <[email protected]> wrote: > > > Hi all, > > > > I looked into our Ode DAO impl , it has three implementations at the > > moment, > > one is Hibernate, one is Memdao, which I thought it is meant to be used > in > > test environment, the other one is JPA, but it ties to openJPA somehow, > as > > it uses the some OpenJPA API directly in the implementation. > > > > Searched the 'hibernate openjpa' keyword in our maillist, only found this > > thread(http://ode.markmail.org/message/mjqsz6ehykpzbons), which is back > in > > Dec, 2008. Little info about these info. Well, I am trying to deploy Ode > > with hibernate as JPA provider. But I learnt from an email that we may > drop > > hibernate implementation in the future, is this still the case? If so, I > > guess we won't provide the migration tool for users from 1.3.x to 2.x > > version. Will we provide a migration tool from the hibernate -> openjpa? > > > > One thing that I didn't fully understand is that we've already tried to > use > > the JPA as our second level of abstraction for the DAO, (the first level > > abstraction I see is our DAO interface), but I see we tied this impl into > > OpenJPA by using following classes. > > > > import org.apache.openjpa.ee.ManagedRuntime; > > import org.apache.openjpa.util.GeneralException; > > > > import org.apache.openjpa.persistence.OpenJPAPersistence; > > import org.apache.openjpa.persistence.OpenJPAQuery; > > > > It would be great that we can abstract these classes out from our jpa > > module, so that openjpa and hibernate can have its own impl. I understand > > the generated schema is pretty different in the openjpa and hibernate, > but > > they are transparent to users/developers. I meant, as long as they are > > using > > the right combination (Hibernate + hibernate generated schema, or OpenJPA > + > > OpenJPA generated schema), they should be fine. > > > > I've noticed that in the hibernate implementation, it is using the > > hibernate > > specifc annotation, which seems to me that it hasn't been actively > > developed > > for a long time. > > > > I'd like to see us using the JPA in its impl, and can be deployed in any > > JPA > > provider, in this case, it would be easy for users to deploy ode into any > > JEE application server. I didn't know whats our plan for our DAO impl, > both > > for the 1.3.x and 2.0 version. Also, some background on this and some > > issues that we've had in the implementation would be of great helpful to > > me. > > > > Thanks > > Jeff > > > -- Cheers, Jeff Yu ---------------- blog: http://jeff.familyyu.net twitter: http://www.twitter.com/jeffyuchang
