Oracle procedure to increase a value to below set amount - oracle

Question

I wish to create a stored procedure that can be called to increase a staff member's salary by an amount passed in. It should firstly create a savepoint and then check that the new salary is below a set threshold and rollback to the savepoint if it is above the threshold.
-- Raise the Salary of the Staff memeber passed in by the amount specified
CREATE OR REPLACE PROCEDURE RAISE (Selection IN Staff.StaffID%TYPE, amount IN Number)
IS
BEGIN
SAVEPOINT save;
UPDATE Staff
-- increase the salary by amount
SET Staff.Salary = (Staff.Salary + amount)
-- Where StaffID is the one passed in
WHERE Staff.StaffID = Selection;
-- If the new value for salary is greater than 100000
IF ( (Staff.Salary) > 100000 )
-- Rollback and undo the changes
THEN ROLLBACK TO save;
-- Print out a message stating this is against business rules etc...
END IF;
END;
/
The code above gives me back the following error:
I have tried the above code with (:NEW.Salary > 100000) but that gives me a bad bind error on New.Salary.
Does anyone have any suggestions? I think I could most probably replicate this functionality by just having a trigger before alter on the staff table, but why is it that the above code doesn't work?
Thanks!

Answer 1

I ended up using a procedure to create the save and to raise the salary, and then a function, which checks the salary passed in against the threshold and returns either 0 or 1 to the procedure, which then rollsback to the earlier save if necessary.
-- Raise the Salary of the Staff memeber passed in by the amount specified
CREATE OR REPLACE PROCEDURE Raise1 (Selection IN Staff.StaffID%TYPE, amount IN Number)
-- Procedure that takes in StaffID and an amount to increase the staff salary by
IS
BEGIN
SAVEPOINT save;
UPDATE Staff
-- increase the salary by amount
SET Staff.Salary = (Staff.Salary + amount)
-- Where StaffID is the one passed in
WHERE Staff.StaffID = Selection;
-- Pass control to the chekraise procedure, which will rollback to the
-- SAVEPOINT created above if the wage is above 100000 in accordance with business rules
IF ( CheckRaise(Selection) = 0)
THEN
ROLLBACK TO save;
DBMS_OUTPUT.PUT_LINE('Reverted Raise as wage exceeded 100000.');
END IF;
END;
/
CREATE OR REPLACE Function CheckRaise (Selection IN Staff.StaffID%TYPE)
RETURN NUMBER
IS
-- Create a variable, to hold the salary we're checking
Sal NUMBER(10);
BEGIN
-- Select the Staff.Salary that was just passed in into the sal variable
SELECT Staff.Salary INTO Sal FROM Staff WHERE Staff.StaffID = Selection;
-- If sal is above threshold
IF (Sal >= 100000)
THEN
-- Return 0, which the procedure will interpret as "Rollback"
RETURN 0;
ELSIF (Sal < 100000)
THEN
RETURN 1;
END IF;
EXCEPTION
WHEN OTHERS THEN
raise_application_error(-20001, 'Uh oh Error - '||SQLCODE||' Unexpected error '||SQLERRM);
END;
/