sql2005下读取字段属性

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    parent_obj = a.id    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 = ' channels '           -- 如果只查询指定表,加上此条件   
   order     by      
          a.id,a.colorder