recursive seek...?

Kello!

I have a recusive relation, like this:
=> create table re( name text, oid parent);
and needed the name from a tuple, and the name of all parents...
i tryd some, like:
=> create function fullname(oid) returns text
-> as 'select fullname(re.parent) || re.name from re where re.oid=$1;'
-> language 'sql';
that isn't work. of course ;(

i can get a name, and the parents oid, and the oid of parents parent etc...
with _MORE_ queries.

for example:
=> select oid,* from re;
oid | name | parent
----+------+--------
5000|one | (NULL or 0)
5001|two | 5000
5002|3d | 5000
5003|4d | 5002
i now the oid:5003. i need the name: "one/two/4d"
must i send thees queries to the backend? (in pseudo code):
$curr=5003
$fulln=''
while $curr do
=> SELECT name, parent FROM re WHERE oid=$curr;
$fulln='$fulln/$name'; $curr=$parent;
enddo
so i liked send _ONLY_ 5003, and reveive in a trice the full name.
this time i can't this ;(

sprintf ("`-''-/").___..--''"`-._ Error In
("%|s", `6_ 6 ) `-. ( ).`-.__.`) Loading Object
"Petike" (_Y_.)' ._ ) `._ `. ``-..-' line:3
/* Neko */ _..`--'_..-_/ /--'_.' ,' Before /*Neko*/
); (il),-'' (li),' ((!.-' see: http://lsc.kva.hu