From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | pgsql-patches(at)postgresql(dot)org |
Subject: | one last patch - array lower and upper bound |
Date: | 2002-09-02 07:17:39 |
Message-ID: | 3D731093.5020709@joeconway.com |
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Lists: | pgsql-patches |
The "Allow easy display of usernames in a group (pg_hba.conf uses groups
now)" item on the open items, and subsequent plpgsql function I sent in,
made me realize it was too hard to get the upper and lower bound of an
array. The attached creates two functions that I think will be very
useful when combined with the ability of plpgsql to return sets.
array_lower(array, dim_num)
- and -
array_upper(array, dim_num)
They return the value (as an int) of the upper and lower bound of the
requested dim in the provided array.
With these, the show_group() function from before looks like:
CREATE OR REPLACE FUNCTION show_group(text) RETURNS SETOF text AS '
DECLARE
loginname text;
low int;
high int;
BEGIN
SELECT INTO low array_lower(grolist,1)
FROM pg_group WHERE groname = $1;
SELECT INTO high array_upper(grolist,1)
FROM pg_group WHERE groname = $1;
FOR i IN low..high LOOP
SELECT INTO loginname s.usename
FROM pg_shadow s join pg_group g on s.usesysid = g.grolist[i];
RETURN NEXT loginname;
END LOOP;
RETURN;
END;
' LANGUAGE 'plpgsql';
If possible, and no objections, please apply for 7.3.
catversion.h bump and initdb required.
Thanks,
Joe
Attachment | Content-Type | Size |
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array-util.1.patch | text/plain | 3.9 KB |
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