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From "Ignacio Andreu" <plunch...@gmail.com>
Subject Re: How to get I get to the read JDBC Connection object...
Date Fri, 04 Apr 2008 17:16:37 GMT
Hi,

The InputStream / reader support is not documented yet, I want to provide
some documentation soon.


BTW I sent a patch for the InputStream / Reader support a week ago, this
patch solves some bugs, Can you review and commit the patch? Thanks in
advance!!



On Fri, Apr 4, 2008 at 5:32 PM, Patrick Linskey <plinskey@gmail.com> wrote:

> >  > Additionally, note that OpenJPA 1.1.0-SNAPSHOT has support for fields
> >  > of type InputStream; with this support, OpenJPA will never fully load
> >  > the data into memory.
> >  I can see how this will work for readonly values, how about write ones?
> >  Also looking in the 1.1.0 manual I can not find any reference to
> InputStream.
>
> I think it hasn't been documented yet. Take a look at
> InputStreamLobTest for an example.
>
> For write values, you simply assign the InputStream field to the
> stream that OpenJPA should read from when streaming to the database:
>
>    @Entity
>    public class Picture {
>        @Persistent private InputStream data;
>
>        public void streamContentsIntoDatabase(InputStream is) {
>            data = is;
>        }
>
>        public InputStream streamContentsFromDatabase() {
>            return is;
>        }
>    }
>
> -Patrick
>
> On Fri, Apr 4, 2008 at 6:57 AM, David Goodenough
> <david.goodenough@btconnect.com> wrote:
> > On Tuesday 01 April 2008, Patrick Linskey wrote:
> >  > Or, even more simply:
> >  >
> >  > em.getTransaction().begin();
> >  > Connection c = OpenJPAPersistence.cast(em).getConnection();
> >  Actually for what I need I need to cast this to a DelegatingConnection
> >  and then get the PGConnection by casting its InnermostDelegate.
> >  But yes, this works - thank you.
> >
> > > try {
> >  >     ...
> >  > } finally {
> >  >     c.close(); // the connection is a wrapper; this decrements the
> >  > reference count
> >  > }
> >  > em.getTransaction().commit();
> >  >
> >  > Additionally, note that OpenJPA 1.1.0-SNAPSHOT has support for fields
> >  > of type InputStream; with this support, OpenJPA will never fully load
> >  > the data into memory.
> >  I can see how this will work for readonly values, how about write ones?
> >  Also looking in the 1.1.0 manual I can not find any reference to
> InputStream.
> >
> >  David
> >
> >
> > >
> >  > -Patrick
> >  >
> >  > On Mon, Mar 31, 2008 at 8:31 PM, Pinaki Poddar <ppoddar@apache.org>
> wrote:
> >  > >  Hi,
> >  > >    Following should work:
> >  > >
> >  > >
> >  > >
> >  > >  import javax.persistence.EntityManager;
> >  > >  import org.apache.openjpa.kernel.Broker;
> >  > >  import org.apache.openjpa.jdbc.kernel.JDBCStore;
> >  > >  import org.apache.openjpa.persistence.JPAFacadeHelper;
> >  > >  import java.sql.Connection;
> >  > >
> >  > >         EntityManager em = emf.createEntityManager();
> >  > >         Broker broker = JPAFacadeHelper.toBroker(em);
> >  > >
> >  > >         JDBCStore store = (JDBCStore)broker.getStoreManager();
> >  > >         Connection con = store.getConnection();
> >  > >
> >  > >  David Goodenough-3 wrote:
> >  > >  > I need to get to the real JDBC Connection object so that I can
> do some
> >  > >  > processing using Postgresql extensions (in particular the
> LargeObject
> >  > >  > support).  I do not expect OpenJPA to understand what I am
> doing, but
> >  > >  > I need to access the Connection object and I need what I do to
> be
> >  > >  > in the same transaction as that used by OpenJPA (so also it
> needs to
> >  > >  > be the same transaction).
> >  > >  >
> >  > >  > The manual suggests:-
> >  > >  >
> >  > >  > OpenJPAEntityManagerFactory kemf = OpenJPAPersistence.cast(emf);
> >  > >  > OpenJPAConfiguration conf = kemf.getConfiguration();
> >  > >  >
> >  > >  > on page 190, but kemf does not have a getConfiguration method
> >  > >  > according to Eclipse (using OpenJPA 1.0.2).
> >  > >  >
> >  > >  > The OpenJPAConfiguration javadoc is not much use either in that
> it
> >  > >  > does tell me where to get it from.
> >  > >  >
> >  > >  > Any ideas?
> >  > >  >
> >  > >  > David
> >  > >
> >  > >  --
> >  > >  View this message in context:
> >  > >
> http://www.nabble.com/How-to-get-I-get-to-the-read-JDBC-Connection-object
> >  > >...-tp16400383p16401689.html Sent from the OpenJPA Users mailing
> list
> >  > > archive at Nabble.com.
> >
> >
> >
>
>
>
> --
> Patrick Linskey
> 202 669 5907
>

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