STEP标准数据存取界面SDAI及在OSCAR中的实现

STEP SDAI AND ITS IMPLEMENTATION IN OSCAR

标准数据存取界面ＳＤＡＩ是ＳＴＥＰ的标准应用程序界面，应用程序通过ＳＤＡＩ存取产品数据。本文先简要介绍了ＳＤＡＩ的功能和组成结构，然后分类说明了ＳＤＡＩ的数据操作，以及在我们自行研制的面向对象工程数据库管理系统ＯＳＣＡＲ中，如何使用字节操作来实现ＳＤＡＩ的数据操作功能，并介绍了ＳＤＡＩ的几个深层数据操作函数；

SDAI is the standard data access interface of STEP.In this paper,we introduce the main function and compositon of SDAI,classify SDAI operations into classes and present their implementation in OSCAR:an object oriented DBMS which is designed and developed by ourselves.Several important problem solving techniques are also presented.Finally,we analysis the advantages and disadvantages of the SDAI.