Question

我正在将数据从一个表插入到其他几个表中。第一个插入将创建一个新的用户标识。此新用户标识将用于后续插入。我还将继续将源表中的用户名插入到其他表中。下面的插入链适用于一个用户。可能涉及2000名用户。

我很熟悉如何使用游标完成此操作。是否有其他方法可以在没有光标的情况下进行此插入链？

insert into table 1 using @username and @firstname from source table

insert into table 2 using userid generated from table 1 (userid1)

insert into table 3 using @username and userid1

insert into table 4 using userid1

Answer 1

您可以使用Insert语句的Output Clause来批量捕获生成的ID。

例如：

Create Table dbo.Source (
  FirstName nvarchar(100),
  LastName nvarchar(100)
);

Create Table dbo.Attrs (
  Id int Identity Not Null Primary Key,
  Name nvarchar(100) Not Null,
  DefaultVal nvarchar(100)
);

Create Table dbo.Table1 (
  Id Int Identity Not Null Primary Key,
  FirstName nvarchar(100),
  LastName nvarchar(100)
);

Create Table dbo.Table2 (
  Id int Identity Not Null Primary Key,
  Table1ID int Not Null Foreign Key References dbo.Table1 (Id),
  AttrId int Not Null Foreign Key References dbo.Attrs (Id)
);

Insert Into dbo.Source Values
  (N'Mickey', N'Mouse'),
  (N'Donald', N'Duck'),
  (N'Goofy', Null);

Insert Into dbo.Attrs Values
  ('Size', 'Small'),
  ('Wings', 'No');

Declare @Temp1 Table (Id Int, FirstName nvarchar(100), LastName nvarchar(100))
Declare @Temp2 Table (Id int, Table1ID int, AttrId int)

Insert Into dbo.Table1
  (FirstName, LastName)
Output 
  inserted.Id, inserted.FirstName, inserted.LastName
Into 
  @Temp1
Select
  FirstName, LastName
From
  dbo.Source


Insert Into dbo.Table2
  (Table1ID, AttrId)
Output
  inserted.Id, Inserted.Table1ID, Inserted.AttrID
Into
  @Temp2
Select
  t.Id,
  a.Id
From
  @Temp1 t
    Cross Join
  dbo.Attrs a

Select * From @Temp2

http://sqlfiddle.com/#!3/31110/3

如何组合几个INSERT？

1 个答案: