Question

我已经创建了一个工作正常的程序，但它永远不会进入if块。在if中，我将leave_Type与'Cl'进行比较。

CREATE DEFINER=`satish`@`%` PROCEDURE `p_Leave_Approval`(
IN uname varchar(45),
IN coment varchar(200),
IN approval varchar(1)
)
BEGIN

-- declare str varchar(2);
-- set str = 'CL';
SELECT Emp_ID INTO @empid 
FROM employee 
WHERE Emp_F_Name=uname; 

UPDATE staff_leave_detail 
SET Leave_Comment=coment
    ,Leave_Status=approval 
WHERE Emp_ID=@empid 
      AND Leave_Status='P';

SELECT Leave_Start_Date, Leave_End_Date INTO @sd, @ed 
FROM   staff_leave_detail 
WHERE  Emp_ID=@empid AND Leave_Status='P';

SELECT DATEDIFF(@sd,@ed)  AS 'd2 - d1' INTO @s;
SELECT Leave_Type INTO @lt 
FROM   staff_leave_detail 
WHERE  Emp_ID=@empid 
       AND  Leave_Status='P';

IF @lt = 'CL' THEN

   UPDATE staff_leave 
   SET AP_CL = AP_CL - @s , 
       AV_CL = AV_CL + @S 
   WHERE Emp_ID = @empid ;

END IF;
END

Answer 1

如果您打算比较

中的字符串

IF @lt = 'CL' THEN

那么你不应该使用字符串比较功能吗？

http://dev.mysql.com/doc/refman/5.0/en/string-comparison-functions.html

如何在程序中的IF条件下进行比较

1 个答案: