[英]How to use multiple triggers?
DROP TRIGGER IF EXISTS N2Trigger
CREATE TRIGGER N2Trigger
ON dbo.Date
FOR INSERT, DELETE
AS
BEGIN
SELECT 'Inserted Datebase' as MESSAGE
SELECT 'Deleted Database' as MESSAGE
END
DELETE FROM dbo.[Date] WHERE ID = 1
這是我在使用插入語句時只想要的代碼 return 'Inserted Datebase' as MESSAGE
當我使用刪除語句返回“已刪除數據庫”作為 MESSAGE
檢查觸發觸發器的操作的最簡單方法是檢查inserted
和deleted
的偽表。 如果觸發器僅在DELETE
/ INSERT
而不是更新時,那么邏輯很簡單:
CREATE TRIGGER dbo.trFlarb ON dbo.flarb
FOR INSERT, DELETE
AS
BEGIN
IF EXISTS (SELECT 1 FROM inserted)
BEGIN
SELECT 'Inserted.';
END
IF EXISTS (SELECT 1 FROM deleted)
BEGIN
SELECT 'Deleted.';
END
END
現在,當然,Marc 是對的:觸發器不是用於返回或打印 output。 這只是一個演示,您可以使用這些檢查來執行在任一操作時需要執行的任何邏輯。
也就是說,如果您有兩件截然不同的事情要做,具體取決於它是插入還是刪除,為什么不創建兩個單獨的觸發器呢?
CREATE TRIGGER dbo.tr_I_Flarb ON dbo.flarb
FOR INSERT
AS
BEGIN
SELECT 'Inserted.';
END
GO
CREATE TRIGGER dbo.tr_D_Flarb ON dbo.flarb
FOR DELETE
AS
BEGIN
SELECT 'Deleted.';
END
GO
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