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';

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.geog@gmail.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 $$
declarer record;loopy record;i integer;sql text;
beginfor r in select * from cities loop i := r.id; sql := 'select city,topic,weight from v_doctopic where city = ' || i; EXECUTE sql; return next loopy;end loop;return;
end;
$$ language 'plpgsql';

select * from getRowsA() AS foo(city int, topic int, weight numeric)



-----
karlg
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