问题描述
我有一个简单的数据库表:employee(id int identity(1,1)，名称varchar(40))
它有5条记录
ID名称
---------------
1 A
2 B
3 C
4 D
5 E
我删除了最后2条记录.
现在，如果我插入，下一条记录将被分配"6"到"ID"列.但是，我希望它插入"4".我应该怎么做..
注意:我无法修改/禁用Identity属性.
请帮忙..客户会吃掉我的工作，因为我必须提供一些演示，但是此问题仍未解决...
I have a simple database table :employee(id int identity(1,1), name varchar(40))
It has 5 records
ID Name
---------------
1 A
2 B
3 C
4 D
5 E
I deleted last 2 records.
Now , if i insert, the next record will be allocate ''6'' to the ''ID'' column. However , i want it to insert ''4''. HOw should i do it..
Note : I cant modify/disable Identity property.
PLease help.. Client will eat my job as i have to give some demo but this issue is still not resolved...
推荐答案
SET IDENTITY_INSERT myTable ON
INSERT INTO employee (id, name) VALUES(4, ‘D′)
SET IDENTITY_INSERT myTable OFF
这样您就可以插入带有旧ID的新记录.但是，强烈建议不要这样做.除非您要重新添加意外删除的记录，或者将现有数据添加到新创建的表中，否则您实际上应该只允许使用下一个数字来创建标识.只有一条记录应该具有该标识值.新记录不应获得旧的(甚至未使用的)值.
That will allow you to insert a new record with an old ID. However, this is highly discouraged practice. Unless you are re-adding a record that you accidentally deleted or you are adding existing data to a newly-created table, you should really just allow the identity to be created with the next number. Only one record should ever have that identity value. A new record should not get an old (even unused) value.
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