这个触发器有问题。我希望它更新请求的信息 只针对有问题的行（我刚刚更新的那一行）而不是整个表。
CREATE TRIGGER [dbo].[after_update]
ON [dbo].[MYTABLE]
AFTER UPDATE
AS
BEGIN
UPDATE MYTABLE
SET mytable.CHANGED_ON = GETDATE(),
CHANGED_BY=USER_NAME(USER_ID())
如何告诉触发器这仅适用于相关行？
【问题讨论】：
标签： sql sql-server tsql sql-server-express sql-server-2014
这是我测试后的例子
CREATE TRIGGER [dbo].UpdateTasadoresName
ON [dbo].Tasadores
FOR UPDATE
AS
UPDATE Tasadores
SET NombreCompleto = RTRIM( Tasadores.Nombre + ' ' + isnull(Tasadores.ApellidoPaterno,'') + ' ' + isnull(Tasadores.ApellidoMaterno,'') )
FROM Tasadores
INNER JOIN INSERTED i ON Tasadores.id = i.id
插入的特殊表将包含更新记录中的信息。
【讨论】：
试试这个（更新，不是更新后）
CREATE TRIGGER [dbo].[xxx_update] ON [dbo].[MYTABLE]
FOR UPDATE
AS
BEGIN
UPDATE MYTABLE
SET mytable.CHANGED_ON = GETDATE()
,CHANGED_BY = USER_NAME(USER_ID())
FROM inserted
WHERE MYTABLE.ID = inserted.ID
END
【讨论】：
这样做很简单， 首先创建您想要保留日志的表的副本 例如，您有 Table dbo.SalesOrder，其中包含 SalesOrderId、FirstName、LastName、LastModified 列
您的版本存档表应该是 dbo.SalesOrderVersionArchieve，其中包含 SalesOrderVersionArhieveId、SalesOrderId、FirstName、LastName、LastModified 列
这是您将如何在 SalesOrder 表上设置触发器
USE [YOURDB]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Karan Dhanu
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
CREATE TRIGGER dbo.[CreateVersionArchiveRow]
ON dbo.[SalesOrder]
AFTER Update
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO dbo.SalesOrderVersionArchive
SELECT *
FROM deleted;
END
现在，如果您在 saleOrder 表中进行任何更改，它将显示 VersionArchieve 表中的更改
【讨论】：
您应该能够访问INSERTED 表并检索 ID 或表的主键。类似于这个例子的东西......
CREATE TRIGGER [dbo].[after_update] ON [dbo].[MYTABLE]
AFTER UPDATE AS
BEGIN
DECLARE @id AS INT
SELECT @id = [IdColumnName]
FROM INSERTED
UPDATE MYTABLE
SET mytable.CHANGED_ON = GETDATE(),
CHANGED_BY=USER_NAME(USER_ID())
WHERE [IdColumnName] = @id
这是 MSDN 上使用触发器时可用的 INSERTED 和 DELETED 表上的链接：http://msdn.microsoft.com/en-au/library/ms191300.aspx
【讨论】：
试试这个解决方案。
DECLARE @Id INT
DECLARE @field VARCHAR(50)
SELECT @Id= INSERTED.CustomerId
FROM INSERTED
IF UPDATE(Name)
BEGIN
SET @field = 'Updated Name'
END
IF UPDATE(Country)
BEGIN
SET @field = 'Updated Country'
END
INSERT INTO CustomerLogs
VALUES(@Id, @field)
// OR
-- If you wish to update existing table records.
UPDATE YOUR_TABLE SET [FIELD]=[VALUE] WHERE {CONDITION}
我没有使用旧版本的 sql server 进行检查，但这将适用于 sql server 2012。
【讨论】：
您可以调用INSERTED，SQL Server 使用这些表来捕获事件发生前后修改行的数据。我假设在您的表中键的名称是Id
我觉得下面的代码可以帮到你
CREATE TRIGGER [dbo].[after_update]
ON [dbo].[MYTABLE]
AFTER UPDATE
AS
BEGIN
UPDATE dbo.[MYTABLE]
SET dbo.[MYTABLE].CHANGED_ON = GETDATE(),
dbo.[MYTABLE].CHANGED_BY = USER_NAME(USER_ID())
FROM INSERTED
WHERE INSERTED.Id = dbo.[MYTABLE].[Id]
END
【讨论】：
尝试使用此脚本创建一个临时表 TESTTEST，并观察触发器按以下顺序调用的优先顺序：1) INSTEAD OF，2) FOR，3) AFTER
所有逻辑都放在 INSTEAD OF 触发器中，我有 2 个示例说明您如何编写某些场景...
祝你好运……
CREATE TABLE TESTTEST
(
ID INT,
Modified0 DATETIME,
Modified1 DATETIME
)
GO
CREATE TRIGGER [dbo].[tr_TESTTEST_0] ON [dbo].TESTTEST
INSTEAD OF INSERT,UPDATE,DELETE
AS
BEGIN
SELECT 'INSTEAD OF'
SELECT 'TT0.0'
SELECT * FROM TESTTEST
SELECT *, 'I' Mode
INTO #work
FROM INSERTED
UPDATE #work SET Mode='U' WHERE ID IN (SELECT ID FROM DELETED)
INSERT INTO #work (ID, Modified0, Modified1, Mode)
SELECT ID, Modified0, Modified1, 'D'
FROM DELETED WHERE ID NOT IN (SELECT ID FROM INSERTED)
--Check Security or any other logic to add and remove from #work before processing
DELETE FROM #work WHERE ID=9 -- because you don't want anyone to edit this id?!?!
DELETE FROM #work WHERE Mode='D' -- because you don't want anyone to delete any records
SELECT 'EV'
SELECT * FROM #work
IF(EXISTS(SELECT TOP 1 * FROM #work WHERE Mode='I'))
BEGIN
SELECT 'I0.0'
INSERT INTO dbo.TESTTEST (ID, Modified0, Modified1)
SELECT ID, Modified0, Modified1
FROM #work
WHERE Mode='I'
SELECT 'Cool stuff would happen here if you had FOR INSERT or AFTER INSERT triggers.'
SELECT 'I0.1'
END
IF(EXISTS(SELECT TOP 1 * FROM #work WHERE Mode='D'))
BEGIN
SELECT 'D0.0'
DELETE FROM TESTTEST WHERE ID IN (SELECT ID FROM #work WHERE Mode='D')
SELECT 'Cool stuff would happen here if you had FOR DELETE or AFTER DELETE triggers.'
SELECT 'D0.1'
END
IF(EXISTS(SELECT TOP 1 * FROM #work WHERE Mode='U'))
BEGIN
SELECT 'U0.0'
UPDATE t SET t.Modified0=e.Modified0, t.Modified1=e.Modified1
FROM dbo.TESTTEST t
INNER JOIN #work e ON e.ID = t.ID
WHERE e.Mode='U'
SELECT 'U0.1'
END
DROP TABLE #work
SELECT 'TT0.1'
SELECT * FROM TESTTEST
END
GO
CREATE TRIGGER [dbo].[tr_TESTTEST_1] ON [dbo].TESTTEST
FOR UPDATE
AS
BEGIN
SELECT 'FOR UPDATE'
SELECT 'TT1.0'
SELECT * FROM TESTTEST
SELECT 'I1'
SELECT * FROM INSERTED
SELECT 'D1'
SELECT * FROM DELETED
SELECT 'TT1.1'
SELECT * FROM TESTTEST
END
GO
CREATE TRIGGER [dbo].[tr_TESTTEST_2] ON [dbo].TESTTEST
AFTER UPDATE
AS
BEGIN
SELECT 'AFTER UPDATE'
SELECT 'TT2.0'
SELECT * FROM TESTTEST
SELECT 'I2'
SELECT * FROM INSERTED
SELECT 'D2'
SELECT * FROM DELETED
SELECT 'TT2.1'
SELECT * FROM TESTTEST
END
GO
SELECT 'Start'
INSERT INTO TESTTEST (ID, Modified0) VALUES (9, GETDATE())-- not going to insert
SELECT 'RESTART'
INSERT INTO TESTTEST (ID, Modified0) VALUES (10, GETDATE())--going to insert
SELECT 'RESTART'
UPDATE TESTTEST SET Modified1=GETDATE() WHERE ID=10-- gointo to update
SELECT 'RESTART'
DELETE FROM TESTTEST WHERE ID=10-- not going to DELETE
SELECT 'FINISHED'
SELECT * FROM TESTTEST
DROP TABLE TESTTEST
【讨论】：
首先，您已经看到的触发器将更新表中的每条记录。没有进行过滤来完成更改的行。
其次，您假设批次中只有一行更改，这是不正确的，因为多行可能会更改。
正确执行此操作的方法是使用虚拟插入和删除表：http://msdn.microsoft.com/en-us/library/ms191300.aspx
【讨论】：
CREATE TRIGGER [dbo].[after_update] ON [dbo].[MYTABLE]
AFTER UPDATE
AS
BEGIN
DECLARE @ID INT
SELECT @ID = D.ID
FROM inserted D
UPDATE MYTABLE
SET mytable.CHANGED_ON = GETDATE()
,CHANGED_BY = USER_NAME(USER_ID())
WHERE ID = @ID
END
【讨论】：