摘要
我所电波传播数据库的数据包括了５０年来积累的广大时空频域的电波环境与电波传播效应数据近１０００千兆字节。这么多的数据士。何录入库中和从库中检索出来，提供用户方便灵活的使用，便是本文要涉及的内容。ＯＲＡＣＬＥ是当今世界上最为流行的具有高性能、开放式和分布式体系结构的关系数据库管理系统，它的应用开发工具ＳＱＬ＊Ｆｏｒｍｓ是非过程的、第四代应用软件工具（４ＧＬ），利用它设计人员可采用原型法进行高效率的应用开发。我们在ＤＥＣ７０００—６１０ＡＸＰ小型计算机平台上，使用ＳＱＬ＊Ｆｏｒｍｓ，设计了电波传播数据库之电离层数据库应用程序，完成对数据库的数据录入、查询和修改等操作。该程序具有兼容性和移植性好，易维护和修改，数据安全可管理等特点。特别是其中采用难度较大的触发器技术并加上内部例程来完成主要的设计任务，使程序更简练、效率更高。
Our Radiowave Propagation Database (RPDB) includes about 100GB data of radiowave environmentand propagation effects. These data are collected over a wide time-space-frequency domain. The design and implementation processes of how to store these data into database or retrieve from it, and how to provide user a convenientand flexible database are introduced in detail, some key technical problems are also discussed in this paper. ORACLEis a relational database management system with high performance, open approach and distributed architecture. ORACLE system SQL * Forms is a general-purpose tool for developing and executing forms-based interactive applications. It is non-procedural,the fourth generation languages (4GL) tool. On the DEC 7000-610 AXP Data CenterServer Computer System, by using SQL* Forms we have created an application program of Ionosphere Database,which is a part of the RPDB. With this application,the end-user can search for, enter,and update data interactively.This application is fully portable and compatible with easy maintenance and modification. The security features protect data access. Especially, we use trigger and Packaged Procedure to perform data validation,data input deletion,and the control of the logical flow of the application. As a result, the application functions have been greatly enhanced.
出处
《电波科学学报》
EI
CSCD
1996年第3期89-97,共9页
Chinese Journal of Radio Science
