Re: [ODBC] BLOB handling compatibility with PostgreSQL > 7.4

From: Ludek Finstrle <luf(at)pzkagis(dot)cz>
To: pgsql-interfaces(at)postgresql(dot)org
Cc: pgsql-odbc(at)postgresql(dot)org
Subject: Re: [ODBC] BLOB handling compatibility with PostgreSQL > 7.4
Date: 2005-12-05 21:28:06
Message-ID: 20051205212806.GA17690@soptik.pzkagis.cz
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-interfaces pgsql-odbc

> We would like to upgrade the Postgres version from our current 7.3 but
> have problems with handling BLOBs via ODBC.
> We use unixODBC-2.2.11 and psqlodbc-08.01.0101.
> With postgres 7.3 lo type was mapped to SQL_C_BINARY and that's changed
> since postgres 7.4.
> Is it an ODBC or a driver issue? Are there any plans to fix the problem?

Hello,

Irine report problem with ODBC. I take deep look at it and find that
lib return base type aid instead of type aid. I'll describe it better.
We have this test suite:

CREATE DOMAIN lo as oid;
CREATE TABLE ow)(b lo);

insert one row:
INSERT INTO es=# select oid from pg_type where typname='lo'; VALUES (lo_import('file'));

we try get it throught libpq (maybe I miss some command):
- PQsetNoticeProcessor(, CC_handle_notice, qres);
- pgres = PQexec(pgconn,query);
- PQsetNoticeProcessor(pgconn, CC_handle_notice, NULL);
...
- typid = PQftype(pgres,i);
this return typid = 26 (oid) instead of 25087 (lo)

postgres=# select oid from pg_type where typname='oid';
oid
-----
26
(1 row)
postgres=# select oid from pg_type where typname='lo';
oid
-------
25087
(1 row)

Is there a way to get 25087? It seems this behaviour is changed between
PgSQL 7.3 and 7.4. It looks like backend issue. Becouse with same binary
it return different values for 7.3 and >= 7.4 (all PgSQL > 7.3 return
typid = 26 - directly tested 7.4, 8.1).

Thanks a lot for help

Luf

In response to

Responses

Browse pgsql-interfaces by date

  From Date Subject
Next Message gribeiro 2005-12-06 13:15:43 pqexecparams and binary data
Previous Message Ludek Finstrle 2005-12-02 11:36:45 Re: Application crash after error

Browse pgsql-odbc by date

  From Date Subject
Next Message noreply 2005-12-06 10:12:19 [ psqlodbc-Bugs-1000460 ] UseServerSidePrepare still broken
Previous Message Ludek Finstrle 2005-12-05 21:06:15 Server side prepare patch #2