Re: plpgsql loop question

On 2/10/2010 11:29 AM, Andrea Visinoni wrote:
> hi,
> i have a table called "zones": idzone, zone_name
> and several tables called zonename_records (same structure), where
> zonename is one of the zone_name in the "zones" table.
> What i want to do is a function that union all of this tables
> dinamically based on "zones" table, this is what i've done so far:
>
> CREATE OR REPLACE FUNCTION get_all_records()
> RETURNS SETOF record AS
> $BODY$DECLARE
> zones record;
> recs record;
> BEGIN
> for zones in select lower(zone_name) as n from zones loop
> for recs in select * from quote_ident(zones.n || '_records') loop
> return next recs;
> end loop;
> end loop;
> RETURN;
> END;
> $BODY$
> LANGUAGE 'plpgsql' VOLATILE
> COST 100;
>
> but i get this error!
>
> ERROR: wrong record type supplied in RETURN NEXT
> CONTEXT: PL/pgSQL function "get_all_records" line 9 at RETURN NEXT
>
> Andrea
>

Pg will not auto build the columns outputted from generic type record.
The function needs to describe what the output is going to look like.

The function can inherit the layout from a table or create the new pg
data type but PG does not know what the data looks like to create the
result set. .

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