Question

我有一个更新一条记录的查询，只有一条记录。是否有方法可以在同一查询中更新Id，例如插入时选择ScopeIdentity。

UPDATE Task
SET MyTime = GetDate(), MyUserId = @userid
FROM (select top 1 table where SomeStuff)

Select Lastrow that just got updated.

Answer 1

是的，请使用OUTPUT子句

示例：

UPDATE Task
SET MyTime = GetDate(), MyUserId = @userid
OUTPUT INSERTED.MyID
FROM (select top 1 table where SomeStuff)

或

DECLARE @MyTableVar TABLE (...

...
UPDATE Task
SET MyTime = GetDate(), MyUserId = @userid
OUTPUT INSERTED.MyID INTO @MyTableVar 
FROM (select top 1 table where SomeStuff)

Answer 2

根据您的操作，您可能需要使用OUTPUT的表格语法。可能是指定临时表/表变量。

DECLARE @T TABLE
(
    MyID INT NOT NULL
)

UPDATE Task
SET MyTime = GetDate(), MyUserId = @userid
OUTPUT INSERTED.MyID INTO @T
FROM (/* your FROM clause here */) Task

gbn在我之前进行了一次编辑，基本上与上面说的一样。我想补充一点，另一种方法是首先获取ID，然后按ID更新。此外，TOP 1应该几乎总是与ORDER BY一起使用。

-- You may need to clean up the error handling. I just wanted
-- to put something simple in to remind that it is necessary.
DECLARE @userid INT; SET @userid = /* e.g., */ 1234
BEGIN TRANSACTION
IF @@ERROR <> 0 RETURN
DECLARE @TaskID INT
SET @TaskID = (SELECT TOP 1 TaskID FROM Task WITH (UPDLOCK) ORDER BY /* e.g., */ TaskID) -- TaskID should be the PK of MyTable. Must be unique.
IF @@ERROR <> 0 BEGIN ROLLBACK TRANSACTION RETURN END
UPDATE Task
SET MyTime = GETDATE(), MyUserId = @userid
WHERE TaskID = @TaskID
COMMIT TRANSACTION

Answer 3

一个简单的方法：

UPDATE TOP (1) Task
SET MyTime = GetDate(), MyUserId = @userid
OUTPUT INSERTED.Id ,INSERTED.Sth
WHERE Stuff=SomeStuff

获取更新的行

3 个答案: