工程数据库中结构实体的定义及操纵

The Upper Logical Definition of Structured Entities in Engineering DBMS

由于工程应用环境中设计对象的复杂性,这就要求工程数据库管理系统能够对复杂的数据结构作为单一实体进行定义并为之提供有效的数据操纵手段。本文论述了MEDAMS多用户工程数据库管理系统中结构工程实体的高层定义方法及其数据操纵设施。

Due to the complexity of design objects,it is necessary for the EDBMS to treat complex data structures as single entities and provide the efficient facilities for data manipulation. This paper describes the facilities to this end by the MEDAMS ( Multi-user Engineering DAtabase Management System), i.e,, method for defining upper logical schema and facilities for manipulating the data with structured entities.