During the development of web-based database information system, the paper introduces the method of building dynamic drop-down menu.
介绍了在开发基于网络的数据库信息系统中，建立动态下拉菜单的方法。
The purpose of this study is to develop a land classification system for national land use and land cover database building and macro land resources dynamic monitoring.
研究目的：研制基于遥感的土地利用与覆被分类系统，为国家土地利用与覆被基础数据库建设和宏观土地资源遥感动态监测提供分类依据。
Several key techniques based on J2EE, including the component development, database access, load balance and multithreading, is discussed for building a distributed and dynamic application system.
文中讨论了J2EE在组件开发、数据库访问、负载平衡与多线程等多项关键技术在建立分布、动态、实际问题的应用。
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