Sql Server 用sql修改列的默认值，查看表的触发器

  由于以前设计考虑不全，现在只要用sql语句改写列的类型和大小。查了资料，调试通过(sql server 2005)

  -- 声明一个变量查看一下的约束

  declare @name varchar(50)
  select  @name =b.name from sysobjects b join syscolumns a on b.id = a.cdefault  where a.id = object_id('table')  and a.name ='column'
  --打印出来查看验证 

  print(@name)

  --删除以前的约束，改变列类型，添加新的约束
 if len(@name)>0 
 begin
        exec('alter table table drop constraint ' + @name)
        exec('alter table table alter column column nvarchar(600)')
        exec('alter table add  default(''0'') for column')
       --or alter table ff add constraint DF_ff_aa_112312 default ('2') for aa
end

 

 

 

查看表的触发器

select c.name as 触发器,a.name 相关的表,(select text from syscomments where id = c.id)
    from sysobjects c ,sysobjects a
    where c.type= 'tr' and  c.xtype ='tr'
    and c.parent_obj = a.id