Re: PERFORM not working properly, please help..

I suppose some workaround would be to introduce temporary cursor:

CREATE OR REPLACE FUNCTION A3() RETURNS VOID AS $BODY$
declare _tmp record;
begin
select * from A1() as dummy ( x double precision ) into _tmp;
end;
$BODY$ LANGUAGE 'plpgsql';

But I'm not sure if this is more effiecent than A3 returning the set. Thanks for replies!

"Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> napisał(a):
> 2010/2/19 <wilczarz1(at)op(dot)pl>:
> > Hi Pavel, thanks for reply. Your solution:
> >
> > CREATE OR REPLACE FUNCTION A3() RETURNS VOID AS $BODY$
> > begin
> >  return query select * from A1();
> >  return;
> > end;
> > $BODY$ LANGUAGE 'plpgsql';
> >
> > generates error "cannot use RETURN QUERY in a non-SETOF function" because A3 returns VOID.
>
> problem is in A3, cannot be void.
>
> PostgreSQL has only function. It hasn't "procedures" where you can
> execute unbinded queries. So if you can take any result from any
> rutine, you have to take it explicitly. VOID in pg means, there are no
> any interesting result, really no any interesting result. It can be
> problem, when you know MySQL procedures or MSSQL procedures. You have
> to forgot on procedures with returning recordset or multirecordset as
> secondary effect.
>
> regards
> Pavel Stehule
>
> >
> >
> > "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> napisał(a):
> >  > Hello
> >  >
> >  > 2010/2/18  <wilczarz1(at)op(dot)pl>:
> >  > > I have a function A1 that returns setof records, and I use it in two ways:
> >  > > 1) from function A2, where I need results from A1
> >  > > 2) from function A3, where I don't need these results, all I need is to
> >  > > execute logic from A1
> >  > >
> >  > > Here ale very simple versions of my functions:
> >  > >
> >  > > CREATE OR REPLACE FUNCTION A1() RETURNS setof record AS $BODY$
> >  > > begin
> >  > > � -- some logic here
> >  > > � return query select col from tab;
> >  > > end;
> >  > > $BODY$ LANGUAGE 'plpgsql';
> >  > >
> >  > > CREATE OR REPLACE FUNCTION A2() RETURNS setof record AS $BODY$
> >  > > begin
> >  > > � -- some logic here
> >  > > � return query select * from A1() as dummy ( x double precision);
> >  > > end;
> >  > > $BODY$ LANGUAGE 'plpgsql';
> >  > >
> >  > > CREATE OR REPLACE FUNCTION A3() RETURNS VOID AS $BODY$
> >  > > begin
> >  > > � perform A1();
> >  > > end;
> >  > > $BODY$ LANGUAGE 'plpgsql';
> >  > >
> >  > > And here are my function calls:
> >  > > select * from A1() as(x double precision) --ok
> >  > > select * from A2() as(x double precision) --ok
> >  > > select * from A3(); --not ok, argh!
> >  > >
> >  >
> >  > it is correct. Every function has own stack for result. There are not
> >  > some global stack. Perform just run function and doesn't copy inner
> >  > result's stack to outer result stack.
> >  >
> >  > your A3 function have to be
> >  > begin
> >  >   return query select * from a1
> >  >   return;
> >  > end;
> >  >
> >  > like a2 function
> >  >
> >  > regards
> >  > Pavel Stehule
> >  > > The last one generates error "set-valued function called in context that
> >  > > cannot accept a set". Why doesn't PERFORM work here? Thanks for help..
> >  > >
> >
> >