【摘要】 提高数据库模型的表达能力是增强数据库系统的性能与功能的关键。本文基于面向对象的思想，吸收语义数据模型、知识的演绎推理机制和图形的组成关系运算，提出了一个面向对象的工程数据库模型。讨论了面向对象的特征、语义构造能力，介绍了知识的表示和图形的生成方法。更多还原

【Abstract】 Improving the expressive ability of database model is important to enhance theperformance and functions of database manager system. Based on object-oriented method,this paper proposes an object -oriented engineering database model (OOEDM), it also absorbes the sementic - database model, the knowledge deductive rulers, and the graphicboolean calculation. It discusses OOEDM’s object - oriented properties, how to capturemore sementics of the application, introduces knowledge expression and method of drawinggraphic.更多还原