SQL Server更新触发器

Question

我之前从未在SQL服务器中使用过触发器,而且我已经在网上查看但是没有找到我的问题的答案.基本上我正在尝试编写一个触发器,它将在表中更新记录后运行.然后,此触发器将根据第一个表中更新的记录更新另外两个表.

带有触发器的主表将使用如下查询更新一条记录:

UPDATE E.SM_T_RList
SET IsActive = 0
WHERE Guid = @Guid

然后我想让触发器做这样的事情:

ALTER TRIGGER [E].[IsActiveUpdate] 
ON  [E].[SM_T_RList] 
AFTER UPDATE
AS
BEGIN

SET NOCOUNT ON;

UPDATE E.SM_T_BInfo
SET IsActive = 0
WHERE Guid = @Guid

UPDATE E.SM_T_RMachines
SET IsActive = 0
WHERE GUID = @GUID

END

我希望更新的Guid正在被主表使用.但我无法弄清楚如何将我希望更新的@Guid更新到触发器中？请帮忙.

谢谢

Answer 1

已发布的答案都存在同样的问题 - 只要基表上发生任何更新,它们就会将其他行标记为非活动状态

就像是:

ALTER TRIGGER [E].[IsActiveUpdate] 
ON  [E].[SM_T_RList] 
AFTER UPDATE
AS
BEGIN

SET NOCOUNT ON;

UPDATE E.SM_T_BInfo
SET IsActive = 0
WHERE Guid IN (SELECT Guid FROM INSERTED where IsActive=0)

UPDATE E.SM_T_RMachines
SET IsActive = 0
WHERE Guid IN (SELECT Guid FROM INSERTED where IsActive=0)

END

会更合适

Answer 2

SQL Server中的触发器对行集而不是单个行进行操作.您可以通过inserted和deleted伪表访问它们.假设您可能希望isactive在以前非活动行处于活动状态时级联的值,您可以使用类似这样的内容.

ALTER TRIGGER [E].[IsActiveUpdate] 
ON  [E].[SM_T_RList] 
AFTER UPDATE
AS
BEGIN

SET NOCOUNT ON;

UPDATE E.SM_T_BInfo
SET IsActive = i.IsActive
FROM INSERTED i JOIN E.SM_T_BInfo e
ON e.Guid = i.Guid

UPDATE E.SM_T_RMachines
SET IsActive = i.IsActive
FROM INSERTED i JOIN E.SM_T_BInfo e
ON e.Guid = i.Guid

END