Refactor a PL/pgSQL function to return the output of various SELECT queries

Question

I wrote a function that outputs a PostgreSQL SELECT query well formed in text form. Now I don\'t want to output a text anymore, but actually run the generated <

Answer 1

You'll probably want to return a cursor. Try something like this (I haven't tried it):

CREATE OR REPLACE FUNCTION data_of(integer)
  RETURNS refcursor AS
$BODY$
DECLARE
      --Declaring variables
      ref refcursor;
BEGIN
      -- make sure `sensors`, `type`, $1 variable has valid value
      OPEN ref FOR 'SELECT Datahora,' || sensors ||
      ' FROM ' || type ||
      ' WHERE nomepcd=' || $1 ||' ORDER BY Datahora;';
      RETURN ref;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION data_of(integer) OWNER TO postgres;