获取字段的元数据

SELECT
    表名=case   when   a.colorder=1   then   d.name   else   ''   end,
    表说明=case   when   a.colorder=1   then   isnull(f.value,'')   else   ''   end,
    字段序号=a.colorder,
    字段名=a.name,
    标识=case   when   COLUMNPROPERTY(   a.id,a.name,'IsIdentity')=1   then   '√'else   ''   end,
    主键=case   when   exists(SELECT   1   FROM   sysobjects   where   xtype='PK'   and   name   in   (
        SELECT   name   FROM   sysindexes   WHERE   indid   in(
            SELECT   indid   FROM   sysindexkeys   WHERE   id   =   a.id   AND   colid=a.colid
        )))   then   '√'   else   ''   end,
    类型=b.name,
    占用字节数=a.length,
    长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
    小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
    允许空=case   when   a.isnullable=1   then   '√'else   ''   end,
    默认值=isnull(e.text,''),
    字段说明=isnull(g.[value],'')
FROM   syscolumns   a
    left join   systypes   b   on   a.xusertype=b.xusertype
    inner join   sysobjects   d   on   a.id=d.id     and   d.xtype='U'   and     d.name<>'dtproperties'
    left join   syscomments   e   on   a.cdefault=e.id
    left join   sys.extended_properties   g   on   a.id=g.major_id   and   a.colid=g.minor_id
    left join   sys.extended_properties   f   on   d.id=f.major_id   and   f.minor_id=0
where d.name='T_B_POMS_COMPANY'         --如果只查询指定表,加上此条件
order by a.id,a.colorder