A CODASYL CAD Data Base System

G. Zintl
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引用次数: 12

Abstract

If in CAD systems a CODASYL data base system is used, one has to avoid some well known disadvantages. To achieve this, we defined for CAD needs in application programs a special high level data manipulation language (HLDML). With this concept the application programs get independent from the data base structure and they are able to work with a "many records at a time"-view. Other provisions reduced some overhead caused by the used data base system.
一个CODASYL CAD数据库系统
如果在CAD系统中使用CODASYL数据库系统,则必须避免一些众所周知的缺点。为了实现这一目标,我们为应用程序中的CAD需求定义了一种特殊的高级数据操作语言(html)。有了这个概念,应用程序可以独立于数据库结构,并且可以使用“一次处理多个记录”的视图。其他规定减少了所使用的数据库系统造成的一些开销。
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