hello guy i'm trying to learn PLSQL and i'm stack on how to create a trigger on pl/sql when a function was used.
i'm tring to create to create a bank database so i create some table like account(numaccount, name, balance, num_card) num_card is a froeigen key card( num_card, max_delay, datecard)
so i make some functions like
-a function that alow to withdaral money from bank branch
-a function that alow to withdaral money using card
-a trigger avoid withdrawaling money when sold < ammount
now i want to create a trigger that avoid withdrawaling money when datecard is < of today date! this is my code:
CREATE OR REPLACE TRIGGER expirationcarte
BEFORE update ON COMPTE
for each row
DECLARE
v_date CARTE.DATEEXPIRATION%type;
BEGIN
select DATEEXPIRATION INTO v_date FROM CARTE C, COMPTE O WHERE C.NUMEROCOMPTE = O.NUMEROCOMPTE;
IF (v_date < to_char(SYSDATE,'MM-DD-YY') ) THEN
RAISE_APPLICATION_ERROR(-20012, 'la carte est expiré');
END IF;
END;
/
i want this trigger only work when the function that alow to withdaral money using card is runing!!