DDE是Windows应用程序间数据通讯的一种方式。本文讨论了利用PowerBuilder的DDE功能设计基于数据库的实时监控系统的实现思路，以及实时数据被存储到SQL Server中用户前端分析、查询界面的设计方法。文中主要讨论了实时数据存储时，防止数据冲突及SQL Server中用户通用查询的解决方法。%This paper introduces the concepts of implementing a real-time supervising system based on database using the DDE function of PowerBuilder. DDE is a mode of data communication between Windows applications. The DDE client program can be easily realized with PowerBuilder. The real-time data can be inserted into SQL Server so as to analyze them in a convenient way. This paper focuses on prevention of data conflicts in real-time storing and a solution to general query in SQL Server by the user.
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