我在做什麼錯誤/這個SQL？

Question

當我運行它時，它不會拋出錯誤，但它不插入/刪除條目。我不知道爲什麼它不起作用。

DECLARE @trAction VARCHAR(5) 
    SET @trAction = 'addTR' 

    IF EXISTS (SELECT TransgeneID 
      FROM tbl_MT 
      WHERE MouseID = '3' AND TransgeneID = '3') 
    IF (@trAction = 'rmvTR')  
     DELETE 
     FROM tbl_MT 
     WHERE MouseID = '3' AND TransgeneID = '3' 
    ELSE 
    IF (@trAction = 'addTR') 
     INSERT INTO tbl_MT 
     VALUES ('3', '3') 

Answer 1

首先，把BEGIN和END在IF's：

DECLARE @trAction VARCHAR(5) 
    SET @trAction = 'addTR' 

    IF EXISTS (SELECT TransgeneID 
      FROM tbl_MT 
      WHERE MouseID = '3' AND TransgeneID = '3') 
    BEGIN 
    IF (@trAction = 'rmvTR')  
    BEGIN 
     DELETE 
     FROM tbl_MT 
     WHERE MouseID = '3' AND TransgeneID = '3' 
    END 
    END 
    ELSE 
    BEGIN 
    IF (@trAction = 'addTR') 
    BEGIN 
     INSERT INTO tbl_MT 
     VALUES ('3', '3') 
    END 
    END 

第二個也是最後，如果第一個IF是真實的，內IF (@trAction = 'rmvTR')將失敗，什麼都不會做。