Question

我有一个SQL MERGE脚本，用于更新存在更新触发器的表。当MERGE脚本只有一个表更新时，触发器工作正常。当MERGE命令附带对表的多个更新时，触发器返回错误。这是触发器：

ALTER TRIGGER [dbo].[userupd] 
ON  [dbo].[users] 
AFTER UPDATE
AS 
BEGIN
        SET NOCOUNT ON;

DECLARE @navn varchar(255), @fornavn varchar(255), @efternavn varchar(255),@initialer varchar(255), @areagroups varchar(255)

SET @fornavn = (SELECT Fornavn FROM DELETED)
SET @efternavn = (SELECT Efternavn FROM DELETED)
SET @initialer = (SELECT Initialer FROM DELETED)
IF  @initialer IS NULL SET @initialer = 'Extern'
SET @navn = @fornavn + ' ' + @efternavn + ' (' + @initialer + ')'
SET @areagroups = (SELECT AddedAreaGroups FROM NOX.dbo.simscodesusers WHERE Username = @navn)
SELECT @areagroups OriginalString, RTRIM(LTRIM(@areagroups)) TrimmedValue
SET @areagroups = ' ' + @areagroups

INSERT  INTO NOX.dbo.SIMScodesAutoUpdate
    ( Action ,
      Username
    )
    SELECT  'DELETE' ,
            D.Fornavn + ' ' + D.Efternavn + ' (' + D.Initialer + ')'
    FROM    DELETED D;               

INSERT  INTO NOX.dbo.SIMScodesAutoUpdate
    ( Action ,
      Username ,
      NoxAutoCode ,
      NoxAutoCodePIN ,
      UserGroup ,
      Startdate ,
      EndDate ,
      AddedAreaGroups
    )
    SELECT  'ADD' ,
            I.Fornavn + ' ' + I.Efternavn + ' (' + I.Initialer + ')' ,
            I.Kortnummer ,
            I.PINkode ,
            I.Brugerniveau ,
            I.Startdato ,
            I.Slutdato,
            @areagroups
    FROM    INSERTED I

END

这是从包含MERGE脚本的SQL作业返回的错误：

Executed as user: CPCORP\SQDKRTV96service. Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. [SQLSTATE 21000] (Error 512) The statement has been terminated. [SQLSTATE 01000] (Error 3621).步骤失败。

是否可以编辑触发器以处理多个值？

提前致谢。

Answer 1

在第二种情况下（“当MERGE命令带有多个更新......”时）DELETED表包含许多行。因此，您无法将MULTI行表分配给ONE SCALAR变量。这是错误的来源'子查询返回的值超过1 ......'：

SET @fornavn = (SELECT Fornavn FROM DELETED)

Microsoft: Create DML Triggers to Handle Multiple Rows of Data

SQL更新触发器无法处理多个条目

1 个答案: