mysql - 存储过程中的案例语句 - 未知系统变量

Question

我正在尝试使用 case 语句根据另一列的值更新一列。我在 MySQL 中名为“rma”的表如下:

ID    |    rma_number    |     serial_number     |    ref_status_id
1     |       9898       |         123456        |          19
2     |       7869       |         098768        |           3

这是我的存储过程:

CREATE DEFINER=`admin`@`localhost` PROCEDURE `delete_update_rma`(in selectedID int, in selectedRMAID int)
begin

declare rmaStatus int(5);

select ref_status_id into rmaStatus
from rma
where id = selectedRMAID;

case rmaStatus
when 19 then
set ref_status_id = 0;

end case;

delete from dropbox where id = selectedID;

end

当我尝试保存以创建过程时，我收到错误 #1193 - Unknown system variable 'ref_status_id'。

任何人都可以帮我确定我的存储过程可能有什么问题吗？

Answer 1

试试这个:

CREATE DEFINER=`admin`@`localhost` PROCEDURE `delete_update_rma`(IN selectedID INT, IN selectedRMAID INT)
BEGIN

UPDATE rma
SET ref_status_id = 
  CASE ref_status_id
    WHEN 19 THEN 0 
    WHEN 3 THEN 2
    ELSE ref_status_id
  END
WHERE id = selectedRMAID;

DELETE FROM dropbox WHERE id = selectedID;

END

检查 SQL FIDDLE DEMO

输出

| ID | RMA_NUMBER | SERIAL_NUMBER | REF_STATUS_ID |
|----|------------|---------------|---------------|
|  1 |      12345 |         67898 |             0 |
|  2 |      45645 |         89056 |             2 |