Oracle put resultset into variable in FORALL - oracle

Question

I have the following plsql block
declare
TYPE t_mds_ids IS TABLE OF mds.id%TYPE;
l_mds_ids t_mds_ids;
l_mds_parents t_mds_parents;
begin
SELECT id BULK COLLECT INTO l_mds_ids FROM mds;
FORALL indx IN l_mds_ids.FIRST .. l_mds_ids.LAST
select l_mds_ids(indx), ch.id_employee_parent
into l_mds_parents
FROM hierarchy_all ch
CONNECT BY ch.id_employee = prior ch.id_employee_parent
START WITH ch.id_employee = l_mds_ids(indx);
EXECUTE IMMEDIATE 'truncate table mds_hierarchy_all';
insert into mds_hierarchy_all
select * from l_mds_parents;
end;
t_mds_parents declared as
create or replace type r_mds_parents as object (
id_mds number(5,0),
id_employee number(5,0)
);
/
create or replace type t_mds_parents as table of r_mds_parents;
/
And I get an exception ORA-00947: not enough values
I really need to put the resultset of multiple rows into variable of TABLE TYPE on each iteration of FORALL loop. I can't use BULK COLLECT into l_mds_parents as it's restricted inside of FORALL.
Is there only solution to use temporary table instead of table variable?

Answer 1

I don't think you can do this with forall. You could use nested loops:
declare
TYPE t_mds_ids IS TABLE OF mds.id%TYPE;
l_mds_ids t_mds_ids;
l_mds_parents t_mds_parents;
begin
SELECT id BULK COLLECT INTO l_mds_ids FROM mds;
l_mds_parents := NEW t_mds_parents();
FOR indx IN l_mds_ids.FIRST .. l_mds_ids.LAST LOOP
FOR rec IN (
select l_mds_ids(indx) as id_employee, ch.id_employee_parent
FROM hierarchy_all ch
CONNECT BY ch.id_employee = prior ch.id_employee_parent
START WITH ch.id_employee = l_mds_ids(indx)
) LOOP
l_mds_parents.extend();
l_mds_parents(l_mds_parents.COUNT)
:= NEW r_mds_parents (rec.id_employee, rec.id_employee_parent);
END LOOP;
END LOOP;
EXECUTE IMMEDIATE 'truncate table mds_hierarchy_all';
insert into mds_hierarchy_all
select * from table(l_mds_parents);
end;
/
But you don't need to use PL/SQL at all; use a single hierarchical query, or probably more simply here, recursive subquery factoring:
insert into mds_hierarchy_all /* (id_mds, id_employee) -- better to list columns */
with rcte (id_mds, id_employee) as (
select m.id, ha.id_employee_parent
from mds m
join hierarchy_all ha on ha.id_employee = m.id
union all
select r.id_mds, ha.id_employee_parent
from rcte r
join hierarchy_all ha on ha.id_employee = r.id_employee
)
select * from rcte;
db<>fiddle with some made-up data.