Oracle 分页

         /* GetDataTable方法需要自己写，传入一个查询语句返回一个datatable */

        /// <summary>
        /// 获取分页数据
        /// </summary>
        /// <param name="PageIndex">页码</param>
        /// <param name="countPerPage">每页条数</param>
        /// <param name="columns">返回结果集的列名集合以逗号隔开</param>
        /// <param name="sqlstr">查询语句</param>
        /// <returns></returns>
        public DataTable GetPageData(int PageIndex, int countPerPage, string columns, string sqlstr)
        {
            DataTable dt = new DataTable();
            //起始条数
            int startRow = (PageIndex - 1) * countPerPage + 1;
            //结束条数
            int endRow = PageIndex * countPerPage;
            string selectStr = "select " + columns + " from (select   rownum  rownumber ," + columns + "  from (" + sqlstr + ") A ) B where rownumber  between " + startRow + " and " + endRow;
            dt = GetDataTable(selectStr);
            return dt;
        }