SQL - 更新，插入或替代觸發器？

Question

如果更新或插入值到我的表中的字段之一，我想檢查該值不包含一些字符。如果是這樣，不要插入任何東西。 我這樣做「而不是」觸發器，但它只適用於插入的行，而不適用於更新的行。我做錯了什麼？我爲這項任務選擇了正確的觸發器嗎？

ALTER TRIGGER trg_MakeSureOfCleanDescription 
ON [dbo].[Car] 
instead OF INSERT 
AS 
    BEGIN 
     DECLARE @CharPosition_Inserted INT; 

     SET @CharPosition_Inserted = 0; 

     DECLARE @CharPosition_Updated INT; 

     SET @CharPosition_Updated = 0; 

     SELECT @CharPosition_Inserted = CHARINDEX('<', inserted.Description) 
     FROM inserted 

     --select @CharPosition_Updated = CHARINDEX('<', inserted.Description) from 
     IF(@CharPosition_Inserted = 0/*and @CharPosition_Updated = 0*/)--only if the description is html free, insert it. Otherwise don't insert nothing. 
     BEGIN 
      PRINT 'no html. inserting.' 

      INSERT INTO Car 
         ([Year], 
         [Make], 
         [Model], 
         [Price], 
         [ExtColor], 
         [IntColor], 
         [Body], 
         [Engine], 
         [Transmission], 
         [Miles], 
         [VIN], 
         [Description], 
         [MainImage], 
         [VideoFile], 
         [StockNumber], 
         [Sold]) 
      SELECT [Year], 
        [Make], 
        [Model], 
        [Price], 
        [ExtColor], 
        [IntColor], 
        [Body], 
        [Engine], 
        [Transmission], 
        [Miles], 
        [VIN], 
        [Description], 
        [MainImage], 
        [VideoFile], 
        [StockNumber], 
        [Sold] 
      FROM inserted 
     END 
    END 

謝謝。我的代碼：

Answer 1

您只是檢查插入操作。更新處理完全不同，必須在單獨的觸發器中處理。由於Insert和Before觸發器之間存在觸發器，所以在Update和Delete觸發器之前和之後都有。在你的情況下，你需要爲更新場景創建另一個觸發器。

https://technet.microsoft.com/en-us/library/ms188601%28v=sql.105%29.aspx