存储过程根据表名得到表结构

create proc [dbo].[getColumns]
@table_name varchar(30)
as
begin
select a.name 表名,b.name 字段名,c.name 字段类型,c.length 字段长度 from sysobjects a,syscolumns b,systypes c where a.id=b.id
and a.name=@table_name and a.xtype='U'
and b.xtype=c.xtype;
end