RE: [INTERFACES] JDBC - large objects

Could I see the section of your code that has this problem?

For the stock JDBC methods to access a large object, you would need your
acl field to be of type oid, otherwise the driver will not recognise it
as a blob.

Also, as of 6.5, autocommit must be turned off, as large objects can
only be accessed from within a transaction.

I presume you are using the 6.5 version of the driver?

Peter

-- 
Peter Mount
Enterprise Support
Maidstone Borough Council
Any views stated are my own, and not those of Maidstone Borough Council.



-----Original Message-----
From: Rolland Crunk [mailto:rc@aenet.net]
Sent: 06 July 1999 10:04
To: pgsql-interfaces@postgreSQL.org
Subject: [INTERFACES] JDBC - large objects




I am having some problem getting the jdbc driver to work properly with
large objects using standard jdbc interfaces.  The tables are pretty
much
standard relational tables except for one column that I serialize 
implementations of the java.security.acl.Acl as objects into. 

The error I get is: ERROR:  lo_write: invalid large obj descriptor (0)

This was the same error I got running the blobtest until I applied
Tatsuo Ishii's
patch I found in the mailing list archives. I tried the same thing in my
code
(turn on explicit transactions when storing a blob) but it doesn't seem
to
have any effect.

I have tried defining the acl field in my create table statement as
both:
:    :acl    oid,:    :

and
:    :acl    char[]:    :

And see same thing.

The same (java) code runs fine using Oracle 8 and their thin driver. 

I guess what I need to know is: is what I am trying to do possible using
PostgreSQL/JDBC without using the PostgreSQL extensions? (not an
option for me).  If so, what should I use for serialized columns in the
create table sql statement?  Can it be done without turning off
autocommit?

Thanks in advance for any help anyone can provide.

Cordially,

rc

ps: My environment is:
Solaris 2.7 (intel)jdk 1.2 (jdk 1.1 fares no better)PostgreSQL 6.5