Re: returning values from dynamic SQL to a variable

Pavel -

RETURN QUERY EXECUTE worked, many thanks for responding so quickly. The
docs show no relevant examples, so for anyone else, something like this

create or replace function getRowsE(
OUT element character(1), OUT name character varying(100), OUT sum
numeric
) returns setof record as $BODY$
declare
r record;
i integer;
usesql text;
begin
for r in select * from mytable where id is not null order by id loop
i := r.graphid;
usesql := 'bunch of sql where ' || i || 'something or other,
producing element, name, sum';
RETURN QUERY EXECUTE usesql;
end loop;
return;
end;
$BODY$ language 'plpgsql';

On 1/15/2013 10:23 AM, Pavel Stehule wrote:
> Hello
>
> you can use RETURN QUERY EXECUTE statement
>
> http://www.postgresql.org/docs/9.1/interactive/plpgsql-control-structures.html#PLPGSQL-STATEMENTS-RETURNING
>
> Regards
>
> Pavel Stehule
>
> 2013/1/15 kgeographer <karl(dot)geog(at)gmail(dot)com>:
>> I have a related problem and tried the PERFORM...EXECUTE pattern suggested
>> but no matter where I put PERFORM I get 'function not found' errors.
>>
>> I want to loop through id values returned by a query and execute another
>> with each i as a parameter. Each subquery will return 6-8 rows. This is a
>> simplified example, in the real app the subquery is doing some aggregation
>> work.
>>
>> Tried many many things including this pattern below and read everything I
>> could find, but no go. Any help appreciated.
>>
>> ++++++++++++++++
>> create or replace function getRowsA() returns setof record as $$
>> declare
>> r record;
>> loopy record;
>> i integer;
>> sql text;
>> begin
>> for r in select * from cities loop
>> i := r.id;
>> sql := 'select city,topic,weight from v_doctopic where city = ' || i;
>> EXECUTE sql;
>> return next loopy;
>> end loop;
>> return;
>> end;
>> $$ language 'plpgsql';
>>
>> select * from getRowsA() AS foo(city int, topic int, weight numeric)
>>
>>
>>
>> -----
>> karlg
>> --
>> View this message in context: http://postgresql.1045698.n5.nabble.com/returning-values-from-dynamic-SQL-to-a-variable-tp5723322p5740324.html
>> Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
>>
>>
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