在Oracle中得到分页数据 得到DataSet的值
例子如下：
       ///
        /// 得到Colletion分页数据
        ///
        public DataSet GetList(int PageIndex, int PageSize, string sortExpression, string strWhere)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("select * ");
            sb.Append(" from (select COLLECTGOODSID,PURCHASENUM,COLLECTIONTAG,MEMBERID,                    T_WEB_GOODS.*  from T_WEB_GOODS,T_WEB_COLLECTGOODS where T_WEB_GOODS.GOODID =                    T_WEB_COLLECTGOODS.GOODSID and  ");
            sb.Append(strWhere);
            sb.Append(" )temp");
            sb.Append(" where rownum>" + (PageIndex - 1) * PageSize + " and rownum