说明：  下拉式日历 PowerBuilder是著名的数据库应用开发工具生产厂商PowerSoft公司推出的产品（PowerSoft现已被数据库厂商Sybase所收购），它完全按照客户机/服务器体系结构研制设计，在客户机/服务器结构中，它使用在客户机中，作为数据库应用程序的开发工具而存在。由于PowerBuilder采用了面向对象和可视化技术，提供可视化的应用开发环境，使得我们利用PowerBuilder，可以方便快捷地开发出利用后台服务器中的数据和数据库管理系统的数据库应用程序。
(drop-down calendar is the famous PowerBuilder database application development tool manufacturers Po werSoft company's products (Wikipedia is now Sybase database collected by the manufacturers purchase), it is fully in accordance with the client/server architecture design developed in the client/server structure, it uses the client, as database application development tools exist. As used PowerBuilder object-oriented and visualization technology, Visualization provides the application development environment, has enabled us to use PowerBuilder, quick and easy to be developed using background of the data server and database management system database applications.)