Procedure to delete only if database higher then sysdate - sql

Question

Ive currently a procedure that deletes a customer a fairly simple procedure that's inside a package body. Here is the code for the procedure that runs and deletes the customer:
PROCEDURE remove_customer (customer_id VARCHAR2) IS
BEGIN
DELETE FROM order_line
WHERE order_line.FK1_order_id in
(SELECT order_id FROM placed_order
WHERE placed_order.FK1_customer_id = remove_customer.customer_id
);
DELETE FROM placed_order
WHERE placed_order.FK1_customer_id = remove_customer.customer_id;
DELETE FROM customer
WHERE customer.customer_id = remove_customer.customer_id;
total_customers := total_customers - 1;
END;
What i want is to only delete that customer if the delivery date has past?
so there would be a if statement in the above procedure I'm just unsure how where and how to add it.
It would be along the lines of
CREATE PROCEDURE remove_customertest (customer_id VARCHAR2) IS
BEGIN
IF placed_order.delivery_date < SYSDATE
THEN
DELETE FROM order_line
WHERE order_line.FK1_order_id in
(SELECT order_id FROM placed_order
WHERE placed_order.FK1_customer_id = remove_customer.customer_id
);
DELETE FROM placed_order
WHERE placed_order.FK1_customer_id = remove_customer.customer_id;
DELETE FROM customer
WHERE customer.customer_id = remove_customer.customer_id;
ELSE
DBMS_OUTPUT.PUT_LINE ('Customer currently has a order been delivered and cant be removed.');
END IF;
END;
Does any one have any advice on this or if I'm on the right lines?
Thanks for the help I'm fairly new to PL/SQL

Answer 1

this condition you can add in the starting of the procedure as follow -
PROCEDURE Remove_Customer(Customer_Id VARCHAR2) IS
l_Order_Date DATE;
BEGIN
BEGIN
SELECT MAX(Delivery_Date)
INTO l_Order_Date
FROM Placed_Order
WHERE Placed_Order.Fk1_Customer_Id = Customer_Id;
EXCEPTION
WHEN OTHERS THEN
l_Order_Date := SYSDATE - 1;
END;
IF l_Order_Date < SYSDATE THEN
DELETE FROM Order_Line
WHERE Order_Line.Fk1_Order_Id IN
(SELECT Order_Id
FROM Placed_Order
WHERE Placed_Order.Fk1_Customer_Id = Customer_Id);
DELETE FROM Placed_Order
WHERE Placed_Order.Fk1_Customer_Id = Customer_Id;
DELETE FROM Customer WHERE Customer.Customer_Id = Customer_Id;
--Total_Customers := Total_Customers - 1; -- is it a global variable in the package?
ELSE
Dbms_Output.Put_Line('Customer currently has a order been delivered');
END IF;
END;