Question

我有以下触发器让我感到悲伤。

ALTER TRIGGER [dbo].[T_DMS_Factory_I]
   ON  [dbo].[jobrun]
   AFTER INSERT
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for trigger here
    IF NOT EXISTS (select * from inserted i
                   inner join [db2].[dbo].[table2] t2 on t2.JobRunID = i.jobrun_id)
       UPDATE [db2].[dbo].[table2]
       SET ProdDt = i.jobrun_proddt,
           CreateDt = GETDATE(),
           JobrunID = i.jobrun_id,
           Start = i.jobrun_time,
           End = i.jobrun_stachgtm,
           Status = i.jobrun_status,
           ActiveDuration = i.jobrun_duration,
           TotalDuration = i.jobrun_duration
       FROM inserted i
       INNER JOIN jobmst jm ON jm.jobmst_id = i.jobmst_id
       WHERE jm.jobmst_alias = 'blah'
END

以上工作正常，但它使用我不想要的相同数据更新所有行。我只希望它从另一个名为baseEnd的列

更新插入时间之前的时间行

WHERE jm.jobmst_alias = 'blah' AND baseEnd <= i.jobrun_time AND JobRunID IS NOT NULL

这是我想象的应该工作，但事实并非如此。我做错了什么？

Answer 1

查看代码中的表格

UPDATE [db2].[dbo].[table2]
SET 
....
FROM inserted i
inner join jobmst jm on jm.jobmst_id = i.jobmst_id
where jm.jobmst_alias = 'blah'

如果您要更新其中的匹配记录，则不应该在FROM子句中使用table2。

否则你只是从inserted和jobmst表中获取一些记录，并从其中一个中激发值到table2中的所有记录

这就是为什么它无论如何都不起作用

很难看出你想要实现的逻辑是什么，但这可能是你需要的

UPDATE t2
SET ProdDt = i.jobrun_proddt,
CreateDt = GETDATE(),
JobrunID = i.jobrun_id,
Start = i.jobrun_time,
End = i.jobrun_stachgtm,
Status = i.jobrun_status,
ActiveDuration = i.jobrun_duration,
TotalDuration = i.jobrun_duration
FROM inserted i
inner join jobmst jm on jm.jobmst_id = i.jobmst_id
inner join [db2].[dbo].[table2] t2 ON  t2.baseEnd <= i.jobrun_time 
where jm.jobmst_alias = 'blah'

SQL Server：如果不存在则触发更新

1 个答案: