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Re: column "oid" does not exist

From: Matthew and Karen Brown <browns(at)usadatanet(dot)net>
Cc: pgsql-odbc(at)postgresql(dot)org
Subject: Re: column "oid" does not exist
Date: 2004-02-18 19:23:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-odbc
Thank you for clarifying this for me. I guess I will just have to dump 
the tables and recreate them with OIDs.

Thanks again.

-- Matt

Shachar Shemesh wrote:

> Matthew and Karen Brown wrote:
>> I get the error message in the subject whenever I attempt to use an 
>> application that supports ODBC to access a user table in my database. 
>> When I create a table using "WITH OIDS", I have no problems viewing 
>> the table with any application. But when I use "WITHOUT OIDS", the 
>> only two applications that I have found that will work are MSQuery 
>> and MSAccess. (I am trying to use Avery DesignPro and OpenOffice 
>> without success.)
> Yes, that makes sense.
>> The things that I have tried (beside pounding my head against a wall) 
>> are just about all of the options in the configuration dialog and, of 
>> course, different applications. My use of PostgreSQL here is 
>> dependent upon my being able to get ODBC to work reliably. Why does 
>> it even care about selecting the OID field? All of the notes I have 
>> seen seem to indicate that its necessity is largely gone and 
>> certainly not relevant for anything that I am doing.
> PostgreSQL does not support updateable cursors. To work around this 
> problem, the ODBC driver uses readonly cursors for its operations. In 
> order for updates to still work, the ODBC driver adds the OID field to 
> all of your queries, and then uses that field to perform the update on 
> a seperate query.
>> Why would some apps be able to run a simple select query without 
>> generating this error while others cannot? I assume that the 
>> difference is in the way the ODBC calls are made by the client app. 
>> If this is so, why does not the driver handle this circumstance more 
>> elegantly?
> If you open your query as "static readonly", there is no need for the 
> OID field, and the query is not changed before being sent to the 
> database server. That must be the difference between them.
> As for why ODBC cannot do that himself, I don't know.
>> In a possibly related issue, when I select from a view using these 
>> same apps, I get the error "colum ctid does not exist". Is this the 
>> same issue?
> exactly the same issue, for exactly the same reason. A view doesn't 
> have the ctid and oid fields, and so you cannot select in read-write 
> mode from a view.
>> I would like to follow the suggestions related to not using OIDs, but 
>> this one has me stumped.
> Sorry. No easy way out that I can see.
>> Grateful for any help,
>> -- Matt

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