我在做什么错误/这个SQL？

Question

当我运行它时，它不会抛出错误，但它不插入/删除条目。我不知道为什么它不起作用。

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 

第二个也是最后，如果第一个IF是真实的，内IF (@trAction = 'rmvTR')将失败，什么都不会做。