Loop cursor question

Question

Hi all...
Really stuck here. So, I have two tables.... one is passenger info, the other is flight info. The passengers have id numbers. When I enter a correct passenger num and flight num my program works fine. What Im trying to do is cause an error to appear if I enter an invalid flight or passenger number. I have a cursor set up for flight and one set up for passenger. I believe my error may be in the fetch? Can someone take a look?
Thanks in advance
CURSOR pass_cursor IS
SELECT pnum, name, age FROM passengers
WHERE pnum=V_pnum;
CURSOR flights_cursor IS
SELECT flnum, dest, hours, cost FROM flights
WHERE flnum=v_flnum;
OPEN pass_cursor;
LOOP
FETCH pass_cursor INTO v_pnum, v_name, v_age;
EXIT WHEN pass_cursor%NOTFOUND;
IF flights_cursor%ISOPEN THEN
CLOSE flights_cursor;
END IF;
OPEN flights_cursor;
LOOP
FETCH flights_cursor INTO v_flnum,v_dest,v_hours,v_cost;
EXIT WHEN flights_cursor%NOTFOUND;

Answer 1

You don't need to loop through the cursors if you just need a validation on primary or unique keys.
DECLARE
CURSOR pass_cursor IS
SELECT pnum, name, age
   FROM passengers
WHERE pnum=V_pnum;
CURSOR flights_cursor IS
SELECT flnum, dest, hours, cost
   FROM flights
WHERE flnum=v_flnum;
-- <variable declaration>
BEGIN
OPEN pass_cursor;
FETCH pass_cursor INTO v_pnum, v_name, v_age;
IF pass_cursor%NOTFOUND THEN
DBMS_OUTPUT.PUT_LINE('Invalid passenger id entered');
CLOSE pass_cursor;
-- RAISE exception;
END IF;
CLOSE pass_cursor;
OPEN flights_cursor;
FETCH flights_cursor INTO v_flnum,v_dest,v_hours,v_cost;
IF flights_cursor%NOTFOUND THEN
DBMS_OUTPUT.PUT_LINE('Invalid flight id entered');
CLOSE flights_cursor;
--RAISE exception;
END IF;
CLOSE flights_cursor;
EXCEPTION
WHEN OTHERS THEN
-- Logic if any exception is raised 
END;