SQL Server 标识列的修改

因工作原因，需要修改sqlserver标识列的值。测试了多次，现总结如下：

一。exec sp_configure 'allow updates',1
        reconfigure with override

二。update syscolumns set colstat = 0 where id = object_id(@tablename) and colstat = 1

三。在此修改相应标识列的内容

四。update syscolumns set colstat = 1 where id = object_id(@tablename) and name = @identitycolumn

五。exec sp_configure 'allow updates',0
       reconfigure with override

六。删除默认约束

    DECLARE @name varchar(100)

SELECT @name=b.name FROM syscolumns a,sysobjects b
   WHERE a.id=object_id(表名) AND b.id=a.cdefault
      AND a.name=列名

EXEC('alter table t_kl_zd_right drop constraint ' + @name)
go

alter table t_kl_zd_right alter column 列名 int
go