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5 查询统计查询模块是数据库管理系统中的重要组成部分,在应用软件中,几乎都有查询功能。 5.1 利用dBASE进行查询程序设计的基本方法 (1)浏览数据库:即对需要检索的数据库,将逐个记录按一定的屏幕格式顺序进行显示,也就是通常成批顺序查找方式。 (2)按任意项进行查询:这是一般的管理系统鄙应提供的查询手段。它按照菜单的提示,由用户输入查询条件,条件一般应包含:字段名、关系运算符和字段的内容等。对接收到的查询条件,系统可用LOCATE命令进行顺序查找,或利用FIND(SEEK)命令对索引过的数据进行快速定位查找。
5 Query Statistics Query module is an important part of the database management system, in the application software, almost all have the query function. 5.1 The basic method of using dBASE query program design (1) Browse the database: that is, the need to retrieve the database, one by one record according to a certain order of screen format display, which is usually batch order to find ways. (2) Search by any item: This is a general management system which should be provided by the means of inquiry. It prompts according to the menu, the user input query conditions, the conditions should generally include: field names, relational operators and field content. For the received query conditions, the system can use the LOCATE command to find the order, or use the FIND (SEEK) command to quickly locate the indexed data.