使用** DELETE FROM…OUTPUT…INTO **时，获取目标表的标识

Question

我使用下面的代码在ArchiveTable存档旧数据，并从SourceTable删除存档数据

DELETE FROM SourceTable 
OUTPUT 
    DELETED.[ID], 
    DELETED.[Code],
    DELETED.[Title]
INTO ArchiveTable([OldID], [Code], [Title])
WHERE Condition

表的结构：

CREATE TABLE [SourceTable](
    [ID] [INT] IDENTITY(1,1) NOT NULL,
    [Code] [VARCHAR](16) NULL,
    [Title] [NVARCHAR](128) NULL,
    CONSTRAINT [PK_SourceTable] PRIMARY KEY CLUSTERED ([ID] ASC)
) 
GO

CREATE TABLE [ArchiveTable](
    [ID] [INT] IDENTITY(1,1) NOT NULL,
    [OldID] [INT] NOT NULL,
    [Code] [VARCHAR](16) NULL,
    [Title] [NVARCHAR](128) NULL,
    CONSTRAINT [PK_ArchiveTable] PRIMARY KEY CLUSTERED ([ID] ASC)
) 
GO

我需要将删除的记录和ArchiveTable.[ID]给应用程序。 我这样更改代码：

DELETE FROM SourceTable 
OUTPUT 
    DELETED.[ID], 
    DELETED.[Code],
    DELETED.[Title]
INTO ArchiveTable([OldID], [Code], [Title])
OUTPUT DELETED.*
WHERE Condition

此代码返回已删除的记录，但我不知道如何获取该记录的ArchiveTable ID。 看ArchiveTable结构，它有OldID列引用SourceTable.ID而ID列则是ArchiveTable的Identity列。 我需要在最终结果中使用ArchiveTable.ID 。

Answer 1

您可以使用临时表

CREATE TABLE #DeletedRows(
    [ID] [INT] NOT NULL,
    [Code] [VARCHAR](16) NULL,
    [Title] [NVARCHAR](128) NULL
)

DELETE SourceTable 
OUTPUT 
    DELETED.[ID], 
    DELETED.[Code],
    DELETED.[Title]
INTO #DeletedRows([ID], [Code], [Title])
WHERE Condition

INSERT ArchiveTable([OldID], [Code], [Title])
OUTPUT INSERTED.*
SELECT [ID], [Code], [Title]
FROM #DeletedRows

DROP TABLE #DeletedRows

具有表变量的变体

DECLARE @DeletedRows TABLE(
    [ID] [INT] NOT NULL,
    [Code] [VARCHAR](16) NULL,
    [Title] [NVARCHAR](128) NULL
)

DELETE SourceTable 
OUTPUT 
    DELETED.[ID], 
    DELETED.[Code],
    DELETED.[Title]
INTO @DeletedRows([ID], [Code], [Title])
WHERE Condition

INSERT ArchiveTable([OldID], [Code], [Title])
OUTPUT INSERTED.*
SELECT [ID], [Code], [Title]
FROM @DeletedRows

Answer 2

我发现在SP和INSERT...EXEC...中将DML与OUTPUT一起使用时发现了一个有趣的变化：

测试表：

CREATE TABLE TestTable(
  ID int NOT NULL PRIMARY KEY,
  Title varchar(10) NOT NULL
)

CREATE TABLE TestTableLog(
  LogID int NOT NULL IDENTITY,
  OperType char(1) NOT NULL,
  CHECK(OperType IN('I','U','D')),
  ID int NOT NULL,
  Title varchar(10) NOT NULL
)

DML程序：

CREATE PROC InsTestTable
  @ID int,
  @Title varchar(10)
AS

  INSERT TestTable(ID,Title)
  OUTPUT inserted.ID,inserted.Title,'I' OperType
  VALUES(@ID,@Title)

GO

CREATE PROC UpdTestTable
  @ID int,
  @Title varchar(10)
AS

  UPDATE TestTable
  SET
    Title=@Title
  OUTPUT inserted.ID,inserted.Title,'U' OperType
  WHERE ID=@ID

GO

CREATE PROC DelTestTable
  @ID int
AS

  DELETE TestTable
  OUTPUT deleted.ID,deleted.Title,'D' OperType
  WHERE ID=@ID

GO

测试：

-- insert test
INSERT TestTableLog(ID,Title,OperType)
EXEC InsTestTable 1,'A'

INSERT TestTableLog(ID,Title,OperType)
EXEC InsTestTable 2,'B'

INSERT TestTableLog(ID,Title,OperType)
EXEC InsTestTable 3,'C'

-- update test
INSERT TestTableLog(ID,Title,OperType)
EXEC UpdTestTable 2,'BBB'

-- delete test
INSERT TestTableLog(ID,Title,OperType)
EXEC DelTestTable 3
GO

-- show resutls
SELECT *
FROM TestTableLog

也许对某人会很有趣。