Hi:
I’m in the business of writting recursive PL-Pgsql functions. I need to know what happens to the data stream from a select cursor inside of which the recursive call is made. For example....
create table int_stream (num integer);
insert into int_stream (num) values (1);
insert into int_stream (num) values (2);
insert into int_stream (num) values (3);
insert into int_stream (num) values (4);
insert into int_stream (num) values (5);
create or replace function my_factorial(integer) returns insteger as $$
in_int alias for $1;
x integer;
rec record;
begin
if(in_int = 1) then
return(1);
end if;
for rec in select num from int_stream where num <= in_int
loop
x := in_int * my_factorial(in_int - 1);
end loop;
return(x);
end;
$$ language plpgsql;
This comes up witht he right answer. IOW, making the recursive call from within the “for rec in...” loop doesn’t seem to destroy the data streams from earlier calls. I just need to make sure that this will always be the case and that getting the correct result in this example is not just an artifact of it’s simplicity. I know, for example, this was a no-no in Oracle. You had to stuff arrays with the resuts from looping in cursors, and then make the recursive call in a subsaquent loop on the arrays.
Thanks
-dave
