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Updating a cursor inside a stored procedure

The following procedure uses an updatable cursor on a SELECT statement. It illustrates how to perform an UPDATE on a row using the stored procedure language.

CREATE PROCEDURE UpdateSalary( 
  IN employeeIdent INT, 
  IN salaryIncrease NUMERIC(10,3) )
BEGIN
   
-- Procedure to increase (or decrease) an employee's salary
   DECLARE err_notfound
      EXCEPTION FOR SQLSTATE '02000';
  DECLARE oldSalary NUMERIC(20,3);
  DECLARE employeeCursor 
    CURSOR FOR SELECT Salary from Employees
               WHERE EmployeeID = employeeIdent
    FOR UPDATE;
  
  OPEN employeeCursor;
  FETCH employeeCursor INTO oldSalary FOR UPDATE;
  IF SQLSTATE = err_notfound THEN
    MESSAGE 'No such employee' TO CLIENT;
  ELSE
    UPDATE Employees SET Salary = oldSalary + salaryIncrease 
      WHERE CURRENT OF employeeCursor;
  END IF;
  CLOSE employeeCursor;
END

The following statement calls the above stored procedure:

CALL UpdateSalary( 105, 220.00 );