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* returning setof in plpgsql
@ 2003-01-21 10:40 David Durst <ddurst@larubber.com>
2003-01-21 14:56 ` Re: returning setof in plpgsql Gary Stainburn <gary.stainburn@ringways.co.uk>
2003-01-21 15:34 ` Re: returning setof in plpgsql Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 2 replies; 4+ messages in thread
From: David Durst @ 2003-01-21 10:40 UTC (permalink / raw)
To: pgsql-sql
I have a function that I want to return setof a table in plpgsql.
Here is what I have:
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';
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'));
Does anyone see a problem w/ my approach??
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: returning setof in plpgsql
2003-01-21 10:40 returning setof in plpgsql David Durst <ddurst@larubber.com>
@ 2003-01-21 14:56 ` Gary Stainburn <gary.stainburn@ringways.co.uk>
1 sibling, 0 replies; 4+ messages in thread
From: Gary Stainburn @ 2003-01-21 14:56 UTC (permalink / raw)
To: pgsql-sql
On Tuesday 21 Jan 2003 10:40 am, David Durst wrote:
> I have a function that I want to return setof a table in plpgsql.
>
> Here is what I have:
>
> 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';
>
> 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'));
>
> Does anyone see a problem w/ my approach??
Hi David,
I've never done this but I seem to remember seeing something about this
recently.
Firstly, I think you need 7.3.1 to do this.
You then have to create a 'type' as being a set of your table. You then
define the function as returning that type.
Sorry I can't be more specific, but as I said, I've never done it.
Gary
>
>
>
>
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^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: returning setof in plpgsql
2003-01-21 10:40 returning setof in plpgsql David Durst <ddurst@larubber.com>
@ 2003-01-21 15:34 ` Tom Lane <tgl@sss.pgh.pa.us>
2003-01-26 03:51 ` Re: returning setof in plpgsql Bruce Momjian <pgman@candle.pha.pa.us>
1 sibling, 1 reply; 4+ messages in thread
From: Tom Lane @ 2003-01-21 15:34 UTC (permalink / raw)
To: ddurst@larubber.com; +Cc: pgsql-sql
"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
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: returning setof in plpgsql
2003-01-21 10:40 returning setof in plpgsql David Durst <ddurst@larubber.com>
2003-01-21 15:34 ` Re: returning setof in plpgsql Tom Lane <tgl@sss.pgh.pa.us>
@ 2003-01-26 03:51 ` Bruce Momjian <pgman@candle.pha.pa.us>
0 siblings, 0 replies; 4+ messages in thread
From: Bruce Momjian @ 2003-01-26 03:51 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: ddurst@larubber.com; pgsql-sql
I thought we had an example of this type of function in the docs, but we
don't. Here is one:
http://www.brasileiro.net:8080/postgres/cookbook/view-recipes.adp?section_id=535&format=long
---------------------------------------------------------------------------
Tom Lane wrote:
> "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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^ permalink raw reply [nested|flat] 4+ messages in thread
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2003-01-21 10:40 returning setof in plpgsql David Durst <ddurst@larubber.com>
2003-01-21 14:56 ` Gary Stainburn <gary.stainburn@ringways.co.uk>
2003-01-21 15:34 ` Tom Lane <tgl@sss.pgh.pa.us>
2003-01-26 03:51 ` Bruce Momjian <pgman@candle.pha.pa.us>
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