From: Bruce Momjian <pgman@candle.pha.pa.us>
Message-Id: <200302030158.h131wQn11351@candle.pha.pa.us>
Subject: Re: TEMP tables
In-Reply-To: <1044235551.2176.29.camel@buddha>
To: Lex Berezhny <LBerezhny@DevIS.com>
Date: Sun, 2 Feb 2003 20:58:26 -0500 (EST)
Cc: pgsql-sql@postgresql.org
MIME-Version: 1.0
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You need to use EXECUTE.  See the FAQ, item 4.26.

---------------------------------------------------------------------------

Lex Berezhny wrote:
> hi,
> 
> I have a plpgsql procedure that needs to create a temporary table, use
> it as a stack internally, and then disgard it when the procedure exits.
> 
> This works great if I only call this procedure ONCE per session. Calling
> it a second time within the same session produces:
> 
> WARNING:  Error occurred while executing PL/pgSQL function render
> WARNING:  line 8 at SQL statement
> ERROR:  Relation 'stack' already exists
> 
> (line 8 is the CREATE TEMP TABLE statement)
> 
> But when I add DROP TABLE stack at the end (but within) the procedure,
> while it works okay the first time around, it produces the following
> error after first execution:
> 
> WARNING:  Error occurred while executing PL/pgSQL function render
> WARNING:  line 9 at SQL statement
> ERROR:  pg_class_aclcheck: relation 20900 not found
> 
> (line 9 is a SELECT * FROM stack statement)
> 
> It seems that after a table is created, dropped and then created again
> it's not recognised.
> 
> When i do this outside of a procedure it works fine (i can create/drop a
> temp table as many times as i want). Is there something magical that
> procedures do when a table is created inside of them? (like cache the
> relation id, and when you swap it underneath them, they panic?) Just
> thoughts. Honestly, I have no clue :-) Which is why I am asking :-)
> 
> What are the recommendations or solutions on using temporary tables
> inside functions on a per call basis?
> 
> thanks a lot,
> 
>  - lex
> 
> -- 
> Lex Berezhny <LBerezhny@DevIS.com>
> 
> 
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