From: Tom Lane <tgl@sss.pgh.pa.us>
To: ddurst@larubber.com
Cc: pgsql-sql@postgresql.org
Subject: Re: returning setof in plpgsql
Date: Tue, 21 Jan 2003 10:34:41 -0500
Message-ID: <2305.1043163281@sss.pgh.pa.us> (raw)
In-Reply-To: <52900.216.86.192.34.1043145602.squirrel@www.la-rubber.com>
References: <52900.216.86.192.34.1043145602.squirrel@www.la-rubber.com>
"David Durst" <ddurst@larubber.com> writes:
> CREATE FUNCTION lookup_account(varchar(32)) RETURNS SETOF accounts AS '
> DECLARE
> aname ALIAS FOR $1;
> rec RECORD;
> BEGIN
> select into rec * from accounts where accountname = aname;
> return rec;
> END;'
> LANGUAGE 'plpgsql';
As written, this function can only return a single row (so you hardly
need SETOF). If you intend that it be able to return multiple rows
when accountname is not unique, then you'll need a loop and RETURN NEXT
commands. It'd probably be less tedious to use a SQL-language function:
CREATE FUNCTION lookup_account(varchar(32)) RETURNS SETOF accounts AS '
select * from accounts where accountname = $1'
language sql;
> This seems to hang when I attempt to select it using:
> select accountid(
> lookup_account('some account')),
> accountname(lookup_account('some account')),
> type(lookup_account('some account')),
> balance(lookup_account('some account'));
It works for me (in 7.3), but in any case that's a bad approach: you're
invoking the function four times, independently. Better is
select accountid,accountname,type,balance
from lookup_account('some account');
(again, this syntax requires 7.3)
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, ddurst@larubber.com
Subject: Re: returning setof in plpgsql
In-Reply-To: <2305.1043163281@sss.pgh.pa.us>
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