sql server查询返回值

Question

以下是我的查询，该查询正在更新User表中的记录，我希望查询返回已更新的UserId，该怎么办？

         UPDATE USER
            SET GroupID = @New_GroupID
           FROM USER 
LEFT OUTER JOIN DOCUMENTS ON User.UserID = Documents.UserID
          WHERE (Documents.UNC = @UNC) 
            AND (User.GroupID = @Old_GroupID)

Answer 1

对于SQL Server 2005+，可以使用OUTPUT子句 ：

UPDATE USER
   SET GroupID = @New_GroupID
OUTPUT INSERTED.id AS ID
     FROM USER u
LEFT JOIN DOCUMENTS d ON d.userid = u.userid
    WHERE d.UNC = @UNC 
      AND u.GroupID = @Old_GroupID

Answer 2

[抓取先前的答案-我读的是INSERT，而不是UPDATE]

您的查询是否总是只更新一行？

Declare @ID int

SELECT @ID=User.UserID
FROM User 
LEFT OUTER JOIN Documents ON User.UserID = Documents.UserID
WHERE     (Documents.UNC = @UNC) AND (User.GroupID = @Old_GroupID)

UPDATE User
Set GroupID = @New_GroupID
Where UserID = @ID

If @@RowCount = 1
 Return @ID
Else
 Return -1  /* problem - multiple rows updated */

Answer 3

如果UserId是您的Identity列，请在当前更新语句之后添加Select @@Scope_Identity 。

如果没有，您只需要做一点修改：

Update User
Set GroupID = @New_GroupID
FROM  User LEFT OUTER JOIN
      Documents ON User.UserId = Documents.UserID
WHERE Documents.UNC = @UNC AND User.GroupID = @Old_GroupID

Select UserId from User where [YourIdentityColumn] = @@Scope_Identity