如何往有自增标识字段的表插入数据时，同时给自增标识字段插入值呢，在Inset Into语句前后加上SQL语句：SET IDENTITY_INSERT TableName ON和SET IDENTITY_INSERT TableName OFF

当要往有设置自增标识字段的表插入数据，并希望同时设置好自增字段的值时，可以在insert into 的SQL语句前后分别加上一句sql语句，SET IDENTITY_INSERT TableName ON和SET IDENTITY_INSERT TableName OFF

//tb_Users 的id字段是种子为1的自增标识字段

SET IDENTITY_INSERT tb_Users ON

if not exists(select * from  tb_Users where id = 1)
begin
insert into  tb_Users (id,name,url) values(1,'曹永思','http://www.cnblogs.com/yonsy')
end
else
begin
update tb_Users set id = 1, name = '曹永思', url = 'http://www.cnblogs.com/yonsy' where  id = 1
end

SET IDENTITY_INSERT tb_Users OFF