1.如果是單使用者，可以使用以下

select nvl(a.column_name, '無註釋') as field,
       nvl(a.comments, '無註釋') as title
  from user_col_comments a
 inner join user_tab_columns b on (a.table_name = b.table_name and
                                  a.column_name = b.column_name)
 where a.table_name = upper(#{tableName})
 order by n.column_id
 

2.如果是多使用者，想從本資料庫獲取其他資料庫的資訊

select nvl(m.column_name, '無註釋') as field,
       nvl(comments, '無註釋') as title
  from dba_col_comments m
 inner join dba_tab_columns n on (m.table_name = n.table_name and
                                 m.owner = n.owner and
                                 m.column_name = n.column_name)
 where table_name = upper(#{tn})
   and owner = upper(#{sn})
 order by n.column_id