sql-server - SQL Server OUTPUT子句

我有些困惑，为什么我似乎无法使用下面的语句来获得插入行的“新标识”。 SCOPE_IDENTITY()仅返回null。

declare @WorkRequestQueueID int
declare @LastException nvarchar(MAX)
set @WorkRequestQueueID = 1
set @LastException = 'test'

set nocount off

DELETE dbo.WorkRequestQueue
OUTPUT
        DELETED.MessageEnvelope,
        DELETED.Attempts,
        @LastException,
        GetUtcdate(), -- WorkItemPoisened datetime
        DELETED.WorkItemReceived_UTC
    INTO dbo.FaildMessages
FROM dbo.WorkRequestQueue
WHERE
    WorkRequestQueue.ID = @WorkRequestQueueID

IF @@ROWCOUNT = 0
  RAISERROR ('Record not found', 16, 1)

SELECT Cast(SCOPE_IDENTITY() as int)

任何帮助将不胜感激。

现在，我使用类似的解决方法。

declare     @WorkRequestQueueID int
declare @LastException nvarchar(MAX)
set @WorkRequestQueueID = 7
set @LastException = 'test'

set nocount on
set xact_abort on

DECLARE @Failed TABLE
(
    MessageEnvelope xml,
    Attempts smallint,
    LastException nvarchar(max),
    WorkItemPoisened_UTC datetime,
    WorkItemReceived_UTC datetime
)

BEGIN TRAN

DELETE dbo.WorkRequestQueue
OUTPUT
    DELETED.MessageEnvelope,
    DELETED.Attempts,
    @LastException,
    GetUtcdate(), -- WorkItemPoisened datetime
    DELETED.WorkItemReceived_UTC

INTO
    @Failed
FROM
    dbo.WorkRequestQueue
WHERE
    WorkRequestQueue.ID = @WorkRequestQueueID

IF @@ROWCOUNT = 0 BEGIN
    RAISERROR ('Record not found', 16, 1)
    Rollback
END ELSE BEGIN
    insert into dbo.FaildMessages select * from @Failed
    COMMIT TRAN
    SELECT Cast(SCOPE_IDENTITY() as int)
END

最佳答案

您可以尝试将表变量用于output子句，从而使您可以显式插入FaildMessages:

declare     @WorkRequestQueueID int
declare @LastException nvarchar(MAX)
set @WorkRequestQueueID = 1
set @LastException = 'test'

set nocount off

    -- Declare a table variable to capture output
    DECLARE @output TABLE (
        MessageEnvelope VARCHAR(50),    -- Guessing at datatypes
        Attempts INT,                   -- Guessing at datatypes
        WorkItemReceived_UTC DATETIME   -- Guessing at datatypes
    )

    -- Run the deletion with output
    DELETE dbo.WorkRequestQueue
    OUTPUT
        DELETED.MessageEnvelope,
        DELETED.Attempts,
        DELETED.WorkItemReceived_UTC
    -- Use the table var
    INTO @output
    FROM dbo.WorkRequestQueue
    WHERE
        WorkRequestQueue.ID = @WorkRequestQueueID

    -- Explicitly insert
    INSERT
    INTO dbo.FaildMessages
    SELECT
        MessageEnvelope,
        Attempts,
        @LastException,
        GetUtcdate(), -- WorkItemPoisened datetime
        WorkItemReceived_UTC
    FROM @output


IF @@ROWCOUNT = 0
  RAISERROR ('Record not found', 16, 1)


SELECT Cast(SCOPE_IDENTITY() as int)