Question

编写一个存储过程，更新员工的每周工作名单，并在给定的分支中为他/她分配最多5个工作班次。要更新名册，该程序可确保：一世。该员工拥有分配给她/他的现有名册。如果给定员工没有现有名单，则该过程不会更新名单，而是打印相应的错误消息。 II。当前名册的日期在更新的名册中移动了一天。例如，如果员工的当前名单显示从周一到周五的工作班次，则更新的名单将从周二到周六分配工作班次。为简单起见，我们假设分配给员工的工作班次的类型和数量仍然存在除非出现例如过度分配的异常，否则每周都相同。但是，经理可能希望手动向员工添加任何额外的工作班次。 III。如果员工的分配工作时数超过标准工作小时数（每周35小时），则会显示警告消息。

任何帮助都表示很难解决这个问题.. MYSQL

DELIMITER //


DROP PROCEDURE IF EXISTS updateRoster 

CREATE PROCEDURE UpdateWeeklyRoster (IN e CHAR(8), IN b INT)
BEGIN
    -- variable declaration
DECLARE WORKING_HOURS INT(35);
DECLARE Updated_Working_Shift_ID INT;

    -- cursor declaration
    DECLARE c1 CURSOR FOR
  EmployeeID,BranchID,WorkingShiftID;
    DECLARE CONTINUE HANDLER FOR NOT FOUND set finished = 1; 

    -- check whether the employee exists or not
    SELECT EmployeeID into e
    FROM DutyRoster 
    WHERE EmployeeID = e;

    IF e IS NULL THEN
SIGNAL SQLSTATE '45000' set MESSAGE_TEXT = 'THERE IS EXISTING ROSTER';
ELSE
-- actual part
        -- delete existing tuples relevant to the given employee and branch id from the Duty Roster table
        OPEN c1;
        -- execute a loop
        REPEAT
FETCH c1 into .... , ....., .....;
            -- find the workingShiftWeekDay: assign appropriate values into Current_Week_Day
            -- Find the Updated_Week_Day
            SET Updated_Week_Day = 
  CASE Current_Week_Day
WHEN Week_day='MONDAY' THEN Updated_Week_Day='TUESDAY';
                                    WHEN 'TUESDAY' THEN 'WEDNESDAY';
                                    WHEN 'THURSDAY' THEN 'FRIDAY';
                                    WHEN 'FRIDAY' THEN 'SATURDAY';
                                    WHEN 'SATURDAY' THEN 'SUNDAY';
                                    WHEN 'SUNDAY' THEN 'MONDAY';

ELSE .....
  END CASE;

            -- Find the current_duty_type

            -- for the updated_week_day, find an appropriate working shift id
            SELECT dutyType into WorkingShiftID
            FROM WorkingShift
            WHERE EmployeeID AND dutyType = CurrentDutyType;

            -- insert the new record
            INSERT INTO DutyRoster VALUES (e,b,Updated_Working_Shift_ID);
            UNTIL ........;
END REPEAT;
        CLOSE c1;
        -- Checking whether an employee works for more than 35 hours
SELECT HOUR(TIMEDIFF(WorkingShiftEndTime,WorkingShiftStartTime)) INTO TOTAL, WORKING_HOURS
from WorkingShift, DutyRoster
WHERE DutyRoster, WorkingShiftID = WorkingShift, WorkingShiftID
AND EmployeeID = e;       
IF TOTAL, WORKING HOURS > 35 THEN
SIGNAL SQLSTATE '45001' SET MESSAGE_TEXT  = 'Employee is working over 35 hours....';
    END IF;
END IF;
END

DELIMITER ; 

DELIMITER //

SQL PROCEDURE ISSUE，不确定数据的放置

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