Re: Continuing problems with using OIDs via JDBC (solved)

Thanks, Barry! That did the  trick. So the magic potion was to use bytea as
the blob representation, in  conjunction with the new 7.2 JDBC drivers.

Thanks again to you and everyone else who responded.

Sridhar

--- Barry Lind <barry@xythos.com> wrote:
> Sridhar,
>
> If you use the 7.2 jdbc driver (which is compatible with a 7.1 database)
> you should look at the latest documentation for jdbc from 7.2.  The blob
> support in the jdbc driver has changed significantly in the 7.2 version
> of the driver and the doc should explain the differences.  You can
> access the 7.2 documentation at
> http://candle.pha.pa.us/main/writings/pgsql/sgml/jdbc.html
>
> If you still are having problems please post a test case that exhibits
> the problem to the maillist.
>
> thanks,
> --Barry
>
>
> M. A. Sridhar wrote:
>
> > Nick,
> >
> > Thanks for the quick response. No joy, though -- I get the same oidin
> error
> > with this driver.
> >
> > Sridhar
> >
> > --- Nick Fankhauser <nickf@ontko.com> wrote:
> >
> >>Sridhar-
> >>
> >>There is a newer driver than the two you listed. Try:
> >>
> >>http://jdbc.postgresql.org/download/jdbc7.2dev-1.2.jar
> >>
> >>Although listed as development, this is pretty stable and will work
> with
> >>postgresql 7.1.
> >>
> >>I haven't tried using it for large objects, so I can't say for sure it
> >>will
> >>help, but it's worth trying while you wait for other responses from the
> >>list.
> >>
> >>-Nick
> >>
> >>
> >>
> >
>
--------------------------------------------------------------------------
> >
> >>Nick Fankhauser  nickf@ontko.com  Phone 1.765.935.4283  Fax
> >>1.765.962.9788
> >>Ray Ontko & Co.     Software Consulting Services
> >>http://www.ontko.com/
> >>
> >>
> >>>-----Original Message-----
> >>>From: pgsql-jdbc-owner@postgresql.org
> >>>[mailto:pgsql-jdbc-owner@postgresql.org]On Behalf Of M. A. Sridhar
> >>>Sent: Saturday, January 26, 2002 5:05 PM
> >>>To: pgsql-jdbc@postgresql.org
> >>>Subject: [JDBC] Continuing problems with using OIDs via JDBC
> >>>
> >>>
> >>>Hello folks,
> >>>
> >>>I would greatly appreciate some help with using large objects in
> >>>PostgreSQL
> >>>via JDBC. I need to create a JDBC-compliant database application tha
> >>>supports multiple database vendors, so using any PostgreSQL-specific
> >>>extensions is difficult. I am trying to replace my current
> >>>
> >>Oracle-on-Linux
> >>
> >>>setup with PostgreSQL, and not having much luck.
> >>>
> >>>My setup is Red Hat Linux 7.1 (or 7.2) running the IBM JDK 1.3. I have
> >>>installed the PostgreSQL version distributed via the stock Red
> >>>Hat RPMs for
> >>>that OS version.
> >>>
> >>>Also, I am a relative newbie to PostgreSQL, although I have worked
> with
> >>>other databases (Oracle and Pointbase in particular). So please
> >>>forgive any
> >>>errors/omissions on my part.
> >>>
> >>>I need to store and retrieve large binary objects. To this end, I have
> >>>followed the directions in the JDBC documentation distributed with the
> >>>PostgreSQL package. Specifically I use the oid data type wherever a
> >>>
> >>large
> >>
> >>>object is needed, and the ResultSet's setBinaryStream/getBinaryStream
> >>>methods to store and retrieve data.
> >>>
> >>>When I try this setup using the JDBC 7.1-1.2 drivers, the problem that
> >>>arises is the driver's inability to handle null values:
> >>>
> >>>FastPath call returned ERROR:  inv_open: large object 0 not found
> >>>
> >>>I would expect that, if the value is null, the driver would return
> null
> >>>instead of throwing an exception.
> >>>
> >>>I found reports of this bug on Google and the PostgreSQL mailing list,
> >>>
> >>and
> >>
> >>>the recommendation was to use the newer drivers. Well, that doesn't
> >>>
> >>work
> >>
> >>>either: both the 7.1-1.2 and 7.1-1.3 drivers (which I downloaded from
> >>>jdbc.fastcrypt.com) fail with an error like
> >>>
> >>>java.sql.SQLException: ERROR:  oidin: error in "..."
> >>>
> >>>when I try to insert a record containing a blob.
> >>>
> >>>And yes, I do use setAutoCommit to ensure that retrievals/updates
> >>>
> >>happen
> >>
> >>>within a transaction, as described in the JDBC documentation.
> >>>
> >>>So I am now unable to use PostgreSQL. Any help is greatly appreciated.
> >>>
> >>I
> >>
> >>>will be glad to give more details (e.g., source code snippets) to
> >>>
> >>clarify
> >>
> >>>if needed.
> >>>
> >>>Thanks in advance.
> >>>
> >>>
> >>>
> >>>=====
> >>>Sridhar
> >>>---
> >>>M. A. Sridhar
> >>>m_a_sridhar@yahoo.com
> >>>
> >>>__________________________________________________
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> >
> >
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