Question

我有两个相同的表，除了一个有一个标识列而另一个没有。而是第二个表使用第一个表中的标识列的值。当一条记录插入第一个表时，我以为我会插入第二个表作为触发器。我似乎无法正确使用语法。

从标识列@EDVisitId返回Null。

ALTER TRIGGER [dbo].[trgInserterrEDVisitOriginal] ON [dbo].[errEDVisit]
AFTER INSERT
AS


--Name:  Bob Avallone
--Date:  6-15-2017
--
--  The purpose of this trigger is to insert a record into errEDVisitOriginal
--  whenever a new errEDVisit is inserted.

--XXXXXXXXXX



    declare @EDVisitId  int
    declare @SubmissionControlID INT


Select  @EDVisitId = EDVisitID from inserted
SELECT @SubmissionControlID = SubmissionControlID  from Inserted


  Begin

Insert Into errEDVisitOriginal (EDVisitId, SubmissionControlID)

VALUES (@EDVisitId, @SubmissionControlID )



End

Answer 1

感谢所有建议。我放弃了触发器的想法。相反，我只是将第一个表中的新记录插入第二个表中。见下文。

Insert errEDVisitOriginal(EdVisitId, SubmissionControlID)
    Select EdVisitId,  SubmissionControlID 
    from errEDVisit where SubmissionControlID = @SubmissionControlID

Answer 2

你只需要scope_identity（）

选择@EDVisitId = scope_identity（）

Answer 3

您可以使用SCOPE_IDENTITY从第一个表中获取最后插入的id，将其放入变量，然后插入第二个表。

https://docs.microsoft.com/en-us/sql/t-sql/functions/scope-identity-transact-sql

Answer 4

Though the decision to duplicate information intentionally is dubious, you are vastly over-thinking the code. Just:

loop()
{
    if (i2cmessage == 1) // act on the semaphore
    {
        cli(); // optional but maybe smart to turn off interrupts while big message traffic going through...
        i2cmessage = 0; // reset until next interrupt
        while (Wire.available())
        {
            messageFromBigArduino = Wire.read();
            // do something with bytes read
        }
        Serial.println(messageFromBigArduino);
        sei(); // restore interrupts if turned off earlier
    }
}

如何在插入触发器SQL Server中检索标识列值

4 个答案: