SQL插入相关表

Question

在我看来,这是一个随着SQL /数据库开发一直出现的问题,但后来我对这一切都不熟悉,所以请原谅我的无知.

我有2张桌子:

CREATE TABLE [dbo].[Tracks](
    [TrackStringId] [bigint] NOT NULL,
    [Id] [bigint] IDENTITY(1,1) NOT NULL,
    [Time] [datetime] NOT NULL,
 CONSTRAINT [PK_Tracks] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
) WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF,
        IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON,
        ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[Tracks] CHECK CONSTRAINT [FK_Tracks_AudioStreams]
GO

ALTER TABLE [dbo].[Tracks]  WITH CHECK ADD  CONSTRAINT
[FK_Tracks_TrackStrings]     FOREIGN KEY([TrackStringId])
REFERENCES [dbo].[TrackStrings] ([Id])
GO

ALTER TABLE [dbo].[Tracks] CHECK CONSTRAINT [FK_Tracks_TrackStrings]
GO

和

CREATE TABLE [dbo].[TrackStrings](
    [Id] [bigint] IDENTITY(1,1) NOT NULL,
    [String] [nvarchar](512) NOT NULL,
 CONSTRAINT [PK_Strings] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
) WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF,
        IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON,
        ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

我想在track表中插入一个新条目.这还将涉及在tracktrings表中插入一个新条目,并确保轨道中的外键列tracktringid指向tracktrings中的新条目.实现这一目标的最有效方法是什么？

Answer 1

首先,插入TrackStrings,省略列列表中的主键列.这将调用其IDENTITY自动生成值的列.

INSERT INTO [dbo].[TrackStrings] ([String]) 
  VALUES ('some string');

其次,插入Tracks并指定为TrackStringId函数SCOPE_IDENTITY(),该函数返回当前作用域中IDENTITY列生成的最新值.

INSERT INTO [dbo].[Tracks] ([TrackStringId], [Time]) 
  VALUES (SCOPE_IDENTITY(), CURRENT_TIMESTAMP());

Answer 2

如果您正在使用SQL Server 2005或更高版本并且在单个中插入大量记录INSERT,则可以在此处查看OUTPUT或OUTPUT INTO选项以使用第二个插入中的标识,而无需"重新查找"要获取的行所有的价值观.IDENTITY