Sql server 在一个查询中将行的序列id作为另一个表中行的外键
数据库是SQL Server 2012 我应该在Excel文件的两个表上添加一组行 我有表Sql server 在一个查询中将行的序列id作为另一个表中行的外键,sql-server,local-variables,tsql-sequence,Sql Server,Local Variables,Tsql Sequence,数据库是SQL Server 2012 我应该在Excel文件的两个表上添加一组行 我有表客户: id | firstname | lastname 1 | John | Doe etc. Customers表有一个序列Customers\u seq用于新行的ID。因为在插入时,行的数量是未知的。详情如下: insert into Customers (id,firstname,lastname) values (next value for custome
客户
:
id | firstname | lastname
1 | John | Doe
etc.
Customers
表有一个序列Customers\u seq
用于新行的ID。因为在插入时,行的数量是未知的。详情如下:
insert into Customers (id,firstname,lastname)
values
(next value for customers_seq, '2016-001', 'John', 'Doe'),
(next value for customers_seq, '2016-002', 'Jane', 'Doe'),
(next value for customers_seq, '2016-003', 'Steve', 'Waters');
-- tons of more customers --
这正是我们想要的
我还有表Services
id | name | fk_Customers
1 | lunch| 2
etc.
现在,问题来了:
在我添加Customers
行的同一个查询中,我应该在表Services
的每一行添加到表Customers
之后添加一行,为Customers
行生成的id
序列将成为添加到Services
表的行上fk_Customers
列的值
我认为使用TSQL局部变量是可能的
比如说:
DECLARE @sequenceCreatedId bigint;
SET @sequenceCreatedId = next value for customers_seq;
insert into Customers (id,firstname,lastname)
values(@sequenceCreatedId, '2016-001', 'John', 'Doe')
insert into Services (id,name,fk_Customers)
values(next value for services_seq, someName, @sequenceCreatedId);
--And just repeat that whole thing. Setting that variable again and again--
SET @sequenceCreatedId = next value for customers_seq;
insert into Customers (id,firstname,lastname)
values(@sequenceCreatedId, '2016-002', 'Jane', 'Doe')
insert into Services (id,name,fk_Customers)
values(next value for services_seq, anotherName, @sequenceCreatedId);
有更好的方法吗?当然可以,使用的
插入部分可以一次获取所有内容:
declare @customers table (
id int not null identity(0, 1)
, firstname nvarchar(100) not null
, lastname nvarchar(100) not null
);
insert into @customers (firstname, lastname)
output inserted.*
values ('John', 'Doe')
, ('Jane', 'Doe')
, ('Steve', 'Waters');
我的示例不使用序列,但它的工作方式相同。请注意,这也适用于更新
或删除
;您甚至可以使用删除
和插入
,一次性获得新旧值:
update a
set a.FirstName = Convert(nvarchar(100), NewId())
output deleted.FirstName as OldFirstName
, inserted.FirstName as NewFirstName
from @customers as a;