单个更新SQL语句的多行更新SQL触发器

Ok. I am quite new to SQL triggers and have had some issues with them. Insert trigger works just fine, and the Delete trigger also. At first, doing a delete on multiple rows would only delete one, but I managed to figure that one out for myself :)

好。我对SQL触发器很新，并且遇到了一些问题。插入触发器工作正常，还有删除触发器。首先，在多行上执行删除只会删除一行，但我设法为自己找出一个:)

However, even after extensive searching (here and on Google) I am unable to find a satisfactory answer to the UPDATE trigger that I have. If I do an update like

然而，即使经过广泛搜索（此处和谷歌），我也无法找到我所拥有的UPDATE触发器的满意答案。如果我做更新，如

UPDATE Customers Set CustomerUser = 0 Where CustomerStatus = 3

Then unfortunately, only the one record would be updated, and the other would remain as they were. Obviously, this is no good.

然后不幸的是，只有一条记录会被更新，而另一条记录将保持不变。显然，这不好。

The trigger I am using is:

我使用的触发器是：

ALTER TRIGGER [dbo].[TRG_TriggerName] ON [dbo].[USER_Customers]

FOR UPDATE

AS
declare @customerid int;
declare @customervenue int;
declare @customeruser int;
declare @customerarea int;
declare @customerevent int;
declare @customerproject int;
declare @customerstatus int;

select @customerid=i.CustomerID from inserted i;
select @customervenue=i.CustomerVenue from inserted i;
select @customerarea=i.CustomerArea from inserted  i;
select @customerevent=i.CustomerEvent from inserted i;
select @customerproject=i.CustomerProject from inserted i;
select @customeruser=i.CustomerUser from inserted i;
select @customerstatus=i.CustomerStatus from inserted i;

Update USER_Instances Set InstanceArea = @customerarea, InstanceVenue = @customervenue, InstanceUser = @customeruser, InstanceStatus = @customerstatus, InstanceEvent = @customerevent, InstanceLastUpdate = GetDate() Where InstanceObject = 17 AND InstanceIdentity = @customerid
GO

As you will immediately realize, this trigger is great - if you want to update just one record. Otherwise, it fails. Now - the main question here would be - How do I catch all the records that need updating, and update them all in one trigger action.

正如您将立即意识到的那样，此触发器很棒 - 如果您只想更新一条记录。否则，它会失败。现在 - 这里的主要问题是 - 如何捕获所有需要更新的记录，并在一个触发操作中更新所有记录。

The examples I have seen here on Stack Overflow confuse me somewhat, or seem ineffective - for instance, it seems most of them deal with updating just ONE value in a second/other table, and not a whole bunch like I am trying to do. The ones that appear to work on multiple values, I can not understand :(

我在Stack Overflow上看到的例子让我感到有些困惑，或者看起来效果不好 - 例如，似乎大多数例子只处理在第二个/另一个表中更新一个值，而不是像我想做的那样整个。似乎在多个值上工作的那些，我无法理解:(

So after about 2 hours of searches, I give up, and hope that you can help me :) I realize this is a trigger-newbie issue, and though I know my MS-SQL, triggers are something I have never used, until now. So any help is greatly welcome :) W

所以经过大约2个小时的搜索，我放弃了，希望你能帮助我:)我意识到这是一个触发器 - 新手问题，虽然我知道我的MS-SQL，触发器是我从未使用过的东西，直到现在。所以任何帮助都非常欢迎:) W

1 个解决方案

#1

It seems that you need something like this

看来你需要这样的东西

ALTER TRIGGER [dbo].[TRG_TriggerName] ON [dbo].[USER_Customers]
FOR UPDATE
AS
UPDATE USER_Instances
   SET InstanceArea = i.CustomerArea, 
       InstanceVenue = i.CustomerVenue, 
       InstanceUser = i.CustomerUser, 
       InstanceStatus = i.CustomerStatus, 
       InstanceEvent = i.CustomerEvent, 
       InstanceLastUpdate = GetDate() 
  FROM USER_Instances JOIN inserted i
    ON InstanceIdentity = i.CustomerID AND InstanceObject = 17

Since inserted virtual table can contain multiple rows you need to JOIN it to correctly do your UPDATE.

由于插入的虚拟表可以包含多行，因此需要将其加入以正确执行更新。

#1