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Table's Field Info

From: "Dmitry Samokhin" <sdld(at)mail(dot)ru>
To: pgsql-odbc(at)postgresql(dot)org
Subject: Table's Field Info
Date: 2005-12-30 08:15:39
Message-ID: dp2qb7$1imf$ (view raw, whole thread or download thread mbox)
Lists: pgsql-odbc
Working in the following environment:

Borland VCL ADO Components -> Microsoft OLE DB Provider for ODBC Drivers -> 
PostgreSQL ODBC Driver -> PostgreSQL Server

and executing SQL statements like this:

SELECT * FROM mytable WHERE ...

I was surprised the driver issues the statement "SELECT * FROM mytable" just 
before executing my custom statement. I guess it tries to retreive the field 
info for "mytable". But what if "mytable" contains mios of rows?! The 
execution will continue forever... Yes, I am aware of the option "Disallow 
Premature". But my Borland TADOQuery object crashes on

begin;declare cursor .. for select ...;fetch backward in ..;close ..;commit 
(unexpected EOF of client connection)

I think this is the easiest way to get no row but the field info:

SELECT * FROM mytable WHERE 0=1

Isn't it?


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