获取分页的查询语句-针对MS2005和Oracle

原创于 2009-09-03 15:30:00 发布 · 540 阅读

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文章标签：

#string #sql #oracle

本文介绍了一种通过输入查询SQL语句、当前页码及每页记录数来生成分页SQL的方法。该方法适用于Oracle数据库，通过计算起始读取行数和结束读取行数，构造出包含ROWNUM伪列的复杂SQL语句实现分页功能。

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        /// <summary>
        /// 返回分页SQL语句
        /// </summary>
        /// <param name="selectSql">查询SQL语句</param>
        /// <param name="PageIndex">当前页码</param>
        /// <param name="PageSize">一页多少条记录</param>
        /// <returns></returns>
        public static string getPageSplitSQL(string selectSql, int PageIndex, int PageSize)
        {
            string StartSelectSql = @" select * from (select aa.*, rownum r from (";
            int CurrentReadRows = PageIndex * PageSize;
            int startRow = (CurrentReadRows - PageSize) < 0 ? 0 : (CurrentReadRows - PageSize);
            int endRow = CurrentReadRows == 0 ? PageSize : CurrentReadRows;
            string EndSelectSql = string.Format(") aa where rownum <= {1}) bb where r >{0} ", startRow, endRow);
            return StartSelectSql + selectSql + EndSelectSql;
        }