Janet, Based on the following spec description, typically (in tx scope) the query result is NOT managed. If the result is an entity (since Query may return various non-entity form) don't expect to get the same managed instance object from your previous persist.
Albert Lee. 3.8.6 Query Execution ... Query and TypedQuery methods other than the executeUpdate method are not required to be invoked within a transaction context, unless a lock mode other than LockModeType.NONE has been specified for the query. In particular, the getResultList and getSingleResult methods are not required to be invoked within a transaction context unless such a lock mode has been specified for the query.[47] *If an entity manager with transaction-scoped persistence context is in use, the resulting entities will be detached; if an entity manager with an extended persistence context is used, they will be managed.* See Chapter 7 for further discussion of entity manager use outside a transaction and persistence context types. On Mon, May 16, 2011 at 4:48 AM, han hongfang <[email protected]> wrote: > Hi all, > > I add openjpa dev list into the loop as well. Looking forward to the > expertise comments from both communities. > > ---------- Forwarded message ---------- > From: han hongfang <[email protected]> > Date: Mon, May 16, 2011 at 5:27 PM > Subject: Should the object returned from query be the same object with the > new created one before being persistent? > To: [email protected] > > > Hi devs, > > I'm looking for if EJB persistence spec has any word on the requirement of > object movie_in and movie_out (see code snippet below). Should they be > movie_in == movie_out or movie_in.equals(movie_out)? > > EntityManager em = getEntityManager(); > Movie movie_in = new Movie("MovieNameA", "DirectorNameA", > "DescriptionA"); > em.persist(movie_in); > em.flush(); > Movie movie_out = (Movie) em.createQuery("select m from MOVIE m > where m.name = 'MovieNameA' ").getSingleResult(); > > I'm hunting in the ejb3.1 spec and persistence2.0 specs for a while, but > failed to find the requirement. Can someone give me a hint on this? Thanks > in advance. > > -- > Best regards, > > Han Hong Fang (Janet) > hanhongfang AT apache.org > > > > > > -- > Best regards, > > Han Hong Fang (Janet) > hanhongfang AT apache.org > -- Albert Lee.
