Calling pipelined function recursively

Question

Hi,
I want to call Z_Get_Subprojects1 function recursively so that i get the childs for all the levels.
please tell is my approach correct.
SELECT *
FROM TABLE (Z_Get_Subprojects1(5060097))
it is giving me only level one projects.
CREATE OR REPLACE FUNCTION Z_Get_Subprojects1 (Prog_id IN NUMBER)
RETURN Ref_Pkg.abc1 pipelined
IS
CURSOR Cur(progid NUMBER)
IS
SELECT
d.ID CHILD_ID, d.UNIQUE_NAME CHILD_UNIQUE_NAME,d.is_program flag
FROM
srm_projects a,
prTask b,
prSubProject c,
srm_projects d
WHERE
a.id = b.prProjectID
AND b.prID = c.prTaskID
AND c.PRREFPROJECTID=d.id
AND a.id=progid
r_ytd_costs abc%ROWTYPE;
BEGIN
FOR c IN cur( Prog_id)
LOOP
     r_ytd_costs.childid := c.child_id ;
     PIPE ROW(r_ytd_costs) ;
SELECT childid INTO temp1
FROM TABLE (Z_Get_Subprojects1(c.child_id));
END LOOP;
RETURN ;
END;
/

Answer 1

yes i agree that we can use connect by but i need to stop at a point where a project is not a program.
whether a project is a program or not is obtained by a field is_program of srm_projects table.
i tried to use the query below using connect by but got incorrect results.
please check if i am using it correctly.
SELECT a.id parent_id,a.name,a.unique_name,d.id child_id,d.name,d.unique_name FROM
SRM_PROJECTS a,
PRTASK b,
PRSUBPROJECT c,
SRM_PROJECTS d
WHERE
a.id = b.prProjectID
AND b.prID = c.prTaskID
AND c.PRREFPROJECTID=d.id
START WITH a.id IN (SELECT id FROM SRM_PROJECTS WHERE is_program=1
MINUS
SELECT PRREFPROJECTID FROM PRSUBPROJECT)
CONNECT BY PRIOR d.id=a.id
ORDER BY a.name