asp.net 无法更新ACCESS数据库的问题

//修改新闻
        public bool Edit(News n)
        {
            string sql = "Update News set title=@title, [desc]=@desc, content=@content Where id=@id";
            OleDbParameter[] param = { 
                                     new OleDbParameter("@title",OleDbType.VarChar),
                                     new OleDbParameter("@desc",OleDbType.VarChar),
                                     new OleDbParameter("@content",OleDbType.VarChar),
                                     new OleDbParameter("@id",OleDbType.Integer)
                                     };
            
            param[0].Value = n.Title;
            param[1].Value = n.Desc;
            param[2].Value = n.Content;
            param[3].Value = n.Id;
            return AccessHelper.Query(sql, param) > 0;
        }