It doesn't; that's not the point of this module. Record will have its own semantics for accessing data, and I think we'll have a backend that hooks into JPA if desired, but the point of the code I'm posting now is for people who want to use JPA directly.
Derek On Sat, Dec 13, 2008 at 6:49 PM, philip <[email protected]> wrote: > > How does it relate to the new "record" way of accessing database? > > On Dec 14, 6:19 am, "Derek Chen-Becker" <[email protected]> wrote: > > OK, party people. I've broken out behaviors into a number of traits. > Since > > I'm coming at this from Lift, I've also added a nice trait to make using > JPA > > from Lift nice and simple. For now I'll host the scaladocs up on my own > > website: > > > > http://chen-becker.org/scalajpa/scaladocs/index.html > > > > The code is available on git: > > > > http://github.com/dchenbecker/scalajpa/tree/master > > > > Just to give you a sample of what this can do, here's how we define a > Local > > JPA module: > > > > object Model extends LocalEM("mypersistenceunit") with RequestVarEM > > > > Ta da! That's it; oyu no longer have to code up the request var stuff, or > > even transaction handling (it's optional on the LocalEM trait, but JNDI > > generally requires JTA). If you want JNDI instead: > > > > object Model extends JndiEM("java:/MyUnitEM") with RequestVarEM > > > > If you'd rather manage the EMs yourself, just drop the RequestVarEM: > > > > object Model extends LocalEM("foo") > > > > and in your code: > > > > val em = Model.newEM > > em.findAll(...) > > em.close() > > > > The RequestVarEM (and ThreadLocalEM, for use outside of Lift) can be used > to > > make your object a singleton ScalaEntityManager, so the EM methods are > > called directly on your object: > > > > Model.createNamedQuery(...) > > Model.lock(...) > > > > I think that with this design we get maximum flexibility by using the > traits > > to control independent behaviors, but as always I'm open to suggestions. > One > > thing I've been vacillating on is naming things like RequestVarEM > > RequestVarSingleton to explicitly show that it makes the object a > singleton > > EM, but I don't know that it makes a huge difference either way. > > > > Cheers, > > > > Derek > > > > PS - I'll discuss getting this up on scala-tools.org with David B. so > that > > it's in the repos soon. > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Lift" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~----------~----~----~----~------~----~------~--~---
