sql - 时态表中包含旧日期的种子数据 - SQL Server

Question

我需要在下面的时态表中为本地开发目的播种数据，开始日期应该是旧的。给定的表架构是

CREATE TABLE [dbo].[Contact](
    [ContactID] [uniqueidentifier] NOT NULL,
    [ContactNumber] [nvarchar](50) NOT NULL,
    [SequenceID] [int] IDENTITY(1,1) NOT NULL,
    [SysStartTime] [datetime2](0) GENERATED ALWAYS AS ROW START NOT NULL,
    [SysEndTime] [datetime2](0) GENERATED ALWAYS AS ROW END NOT NULL,
 CONSTRAINT [PK_Contact] PRIMARY KEY NONCLUSTERED 
(
    [ContactID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
    PERIOD FOR SYSTEM_TIME ([SysStartTime], [SysEndTime])
) ON [PRIMARY]
WITH
(
    SYSTEM_VERSIONING = ON (HISTORY_TABLE = [dbo].[ContactHistory] , DATA_CONSISTENCY_CHECK = ON )
)

我需要将一些旧的过时数据插入到该表中。

INSERT INTO dbo.Contact
(
    ContactID,
    ContactNumber,
    --SequenceID - this column value is auto-generated
    SysStartTime,
    SysEndTime
)
VALUES
(
    NEWID(), -- ContactID - uniqueidentifier
    N'9999912345', -- ContactNumber - nvarchar
    -- SequenceID - int
    '2017-09-01 06:26:59', -- SysStartTime - datetime2
    NULL -- SysEndTime - datetime2
)

我收到以下错误。

Cannot insert an explicit value into a GENERATED ALWAYS column in table 'DevDB.dbo.Contact'. Use INSERT with a column list to exclude the GENERATED ALWAYS column, or insert a DEFAULT into GENERATED ALWAYS column.

请帮助我如何将旧数据添加或更新到此时态表

Answer 1

终于找到解决办法了

第 1 步:需要关闭SYSTEM_VERSIONING

ALTER TABLE dbo.Contact SET (SYSTEM_VERSIONING = OFF);

第 2 步:需要删除PERIOD FOR SYSTEM_TIME

ALTER TABLE dbo.Contact DROP PERIOD FOR SYSTEM_TIME

第 3 步:插入包含过去日期的所需记录

INSERT INTO dbo.Contact
(
    ContactID,
    ContactNumber,
    SysStartTime,
    SysEndTime
)
VALUES
(
    NEWID(), -- ContactID - uniqueidentifier
    N'1234567890', -- ContactNumber - nvarchar
    '2014-09-13 00:00:00', -- SysStartTime - datetime2
    '9999-12-31 23:59:59' -- SysEndTime - datetime2
)

步骤#4:需要添加PERIOD FOR SYSTEM_TIME

ALTER TABLE dbo.Contact
ADD PERIOD FOR SYSTEM_TIME ([SysStartTime], [SysEndTime])

步骤#5:需要将其ON切换到SYSTEM_VERSIONING

ALTER TABLE dbo.[Contact] SET (SYSTEM_VERSIONING = ON
 (HISTORY_TABLE=dbo.[ContactHistory],DATA_CONSISTENCY_CHECK=ON)
);

就是这样...