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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