If I remove the line calling PERFORM it works without problems moving the children node for the passed integer into
testand then exiting.
I can then repeat the process going through the output to test iteratively and do not have any problems.
However if I put the PERFORM line back in to create a recursive function it just goes on forever, and I only have 6
nodes.
CREATE FUNCTION get_children (integer) RETURNS integer AS
' DECLARE pnode_parent ALIAS FOR $1; rec RECORD; BEGIN FOR rec IN SELECT * FROM
tree_adjacency_matrixWHERE node_parent = pnode_parent LOOP INSERT INTO test (node1, node2)
VALUES(rec.node_child,rec.node_parent); PERFORM get_children(rec.node_child); END LOOP;
RETURN0; END;
'LANGUAGE 'plpgsql'
Mark
On Saturday 10 February 2001 03:29, Tom Lane wrote:
> <plpgsql@polar-digital.com> writes:
> > Are recursive functions allowed in in 7.0.3
>
> Sure.
>
> play=> create function myfactorial(int) returns int as '
> play'> begin
> play'> if $1 > 1 then
> play'> return $1 * myfactorial($1 - 1);
> play'> end if;
> play'> return $1;
> play'> end;' language 'plpgsql';
> CREATE
> play=> select myfactorial(1);
> myfactorial
> -------------
> 1
> (1 row)
>
> play=> select myfactorial(10);
> myfactorial
> -------------
> 3628800
> (1 row)
>
> play=>
>
> I get a stack overflow crash at about myfactorial(7500), but that seems
> like a sufficient level of recursion depth for normal purposes ...
>
> > as I seem to be unable to
> > get them to work in plpgsql,
>
> Are you sure you aren't asking for infinite recursion, eg by invoking
> the same function with the same argument?
>
> regards, tom lane
