From: Thomas F. O'Connell <tfo@sitening.com>
To: mario.splivalo@mobart.hr
Cc: pgsql-sql@postgresql.org
Subject: Re: EXECUTE with SELECT INTO variable, or alternatives
Date: Fri, 30 Sep 2005 15:59:06 -0500
Message-ID: <1045972B-4D8E-4801-A958-76A1DB6FAD0B@sitening.com> (raw)
In-Reply-To: <1128017805.9061.5.camel@localhost.localdomain>
References: <1128017805.9061.5.camel@localhost.localdomain>
Per the docs:
"The results from SELECT commands are discarded by EXECUTE, and
SELECT INTO is not currently supported within EXECUTE. So there is no
way to extract a result from a dynamically-created SELECT using the
plain EXECUTE command. There are two other ways to do it, however:
one is to use the FOR-IN-EXECUTE loop form described in Section
35.7.4, and the other is to use a cursor with OPEN-FOR-EXECUTE, as
described in Section 35.8.2."
http://www.postgresql.org/docs/8.0/static/plpgsql-
statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
So you've already hit upon one of your options.
--
Thomas F. O'Connell
Co-Founder, Information Architect
Sitening, LLC
Strategic Open Source: Open Your i™
http://www.sitening.com/
110 30th Avenue North, Suite 6
Nashville, TN 37203-6320
615-469-5150
615-469-5151 (fax)
On Sep 29, 2005, at 1:16 PM, Mario Splivalo wrote:
> I can assign a value to a variable in several ways:
>
> myVar := (SELECT col FROM table WHERE somecondition...)
> myVar := col FROM table WHERE somecondtition...
> SELECT col INTO myVar FROM table WHERE somecondition
>
> How do I do any of the above using EXECUTE? I need to be able to
> assign
> the value to a variable, a value returned by a querry on a temporary
> table.
>
> So far I have found workaround like this:
>
> myRec record;
>
> FOR rec IN EXECUTE ''SELECT col FROM table WHERE somecondition''
> LOOP
> myVar := rec
> END LOOP
>
> Obviously, the above SELECT query returns only one row. Still, if is
> realy inconvinient to have FOR...LOOP...END LOOP construct for
> assigning
> the value to a variable 'read' from the temporary table.
>
> Mario
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To: pgsql-sql@postgresql.org
Cc: tfo@sitening.com, mario.splivalo@mobart.hr
Subject: Re: EXECUTE with SELECT INTO variable, or alternatives
In-Reply-To: <1045972B-4D8E-4801-A958-76A1DB6FAD0B@sitening.com>
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