迭代计算一个四阶黎卡提方程

一种基于数据访问流的数据库索引优化方法该方法通过集成业务流程模型与数据模型，抽取了流程活动中包含的数据访问操作和流程的控制结构形成数据访问流，分析了数据访问流中数据访问操作的频度，为频繁数据访问操作所对应的数据项创建索引，达到改善数据访问性能的目的。实验结果表明，该方法提高了数据查询的速度。-A novel method called data-access-flow based index optimization (DAFIO) is proposed to provide automatic index select for databasein order to improve the data access performance. By integrating the data model and process model of the IT systems and getting data access flow, theDAFIO method can analyze the data access flow to find those data item which are accessed frequently, and then create indexes for these frequentitems. The experiment results show that the novel method is effective to improve the data access performance.

我做Excel报表，很老了Rksvr.ini文件文档在以下设置中，您必须更改实际的目录系统[syspath]=D:excelu sample1 temporary=D:excelu sample1与此相关的图片如下：点击查看文档忘记注意这是因为在vfp6下写入，所以选择对vfp8语句稍加改动，请自行修改

一个简单的minisql，能实现sql语句的基本功能，创建、查询和删除，创建索引等-a simple minisql, sql statement to achieve the basic functions to create, search and delete, create indexing

access转换为execl,方便打印报表-access into execl facilitate print statements, etc.

利用栈实现算术表达式的求值。可以简单一些，假设表达式中含有一位整数，以及+、-、*、/、（、）。但不受此限制。

ADO 数据库操作

MySQL是一个小型关系型数据库管理系统，开发者为瑞典MySQL AB公司。在2008年1月16号被Sun公司收购。目前MySQL被广泛地应用在Internet上的中小型网站中。由于其体积小、速度快、总体拥有成本低，尤其是开放源码这一特点，许多中小型网站为了降低网站总体拥有成本而选择了MySQL作为网站数据库。MySQL的官方网站的网址是：www.mysql.com-MySQL is a small relational database management system, development of the Swedish company MySQL AB. In January 16, 2008 acquired by Sun. MySQL is currently being widely used in Internet, small and medium-sized site. Because of its small size, speed and low total cost of ownership, in particular the characteristics of open source, many small and medium-sized Web sites in order to reduce the total cost of ownership and choose the MySQL database as a Web site. MySQL

关于教学管理的数据库-on teaching management database

phpMySQLAutoBackup能自动备份mysql数据库，并将导出的数据库（数据与结构）压缩成gzip格式然后用email通知你。phpMySQLAutoBackup能够按设置每天/周定时备份，选择不同的表格来备份，当备份表格时,可以设置备份开始和结束的行数，以便让你能够有选择的备份一个巨大表格(数百万条数据)任一部分。 -phpMySQLAutoBackup can automatically backup mysql database, and export the database (data and structure) and then compressed into gzip format to inform you by email. phpMySQLAutoBackup able to set up a day/week timer backup, choose a different form to back up, when the back-up form, you can set the beginning and end of back-up the number of rows, so that you can choose to backup a large table (millions of data) any part of.

利用桶排序给数组a排序，建立的桶为b和e，其中b为含有十万个桶，e为只有一个链表的桶，然后对b和e使用插入算法排序，比较两种算法的时间，b需要40毫秒左右，e需要9到10分钟。-use barrels a ranking to the array, in order to establish the barrels of b and e, b to contain 100,000 barrels of only one e Chain barrels, and then to b e used to insert sorting algorithm, the algorithm for comparing two hours, b needs about 40 milliseconds, e needs 9 10 minutes.