I am by no means an OpenJPA expert, but I did see something related
to this when reading the docs yesterday. OpenJPA has a
QueryResultsCache where it keeps the results of a query so if you run
the query again you get the same results (I'm not sure if that is
what you want). Here is the code from the docs:
OpenJPAEntityManagerFactory oemf = OpenJPAPersistence.cast(emf);
QueryResultCache qcache = oemf.getQueryResultCache();
EntityManager em = emf.createEntityManager();
Query pinQuery = em.createQuery(...).
setParameter(0, paramVal0).
setParameter(1, paramVal1);
qcache.pin(pinQuery);
Query unpinQuery = em.createQuery(...).
setParameter(0, paramVal0).
setParameter(1, paramVal1);
qcache.unpin(unpinQuery);
Hope that helped.
-dain
On Dec 8, 2006, at 8:04 PM, roger.keays wrote:
Hi,
I'm trying to use OpenJPA's fetch plan extensions to have a query
return a
large result set. It seems to work okay, except that the LRS gets
closed /
detached with the EntityManager, which only makes it useful for one
request.
Is it possible to have the LRS stay open after the em has been
disposed?
Thanks,
Roger
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