| 工程数据库管理系统DATFEA的复杂对象模型 |
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| 引用本文： | 刘秉毅.工程数据库管理系统DATFEA的复杂对象模型[J].军械工程学院学报,1992(3). |
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| 作者姓名： | 刘秉毅 |
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| 作者单位： | 军械工程学院电工教研室 |
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| 摘 要： | 本文根据CAD应用中广泛存在着复杂结构的工程对象以及工程对象之间以层次联系为主的特点,综合关系数据模型和层次数据模型的优点而设计出一种新的数据模型——COHOR数据模型,本文提出COHOR数据模型的形式化定义,并证明COHOR对象集在子对象关系下作成一半序格,讨论了COHOR对象的基本操作。
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| 关 键 词： | CAD 工程数据库 复杂对象 数据模型 |
THE COMPLEX OBJECT DATA MODEL OF ENGINEERING DATABASE MANAGEMENT SYSTEM(DATFEA) |
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| Liu Bingyi,Teaching and Research Section of Electrical Engineering.THE COMPLEX OBJECT DATA MODEL OF ENGINEERING DATABASE MANAGEMENT SYSTEM(DATFEA)[J].Journal of Ordnance Engineering College,1992(3). |
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| Authors: | Liu Bingyi Teaching and Research Section of Electrical Engineering |
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| Abstract: | This paper presents a new data model, called COHOR data model, which synthesizes the advantages of relational data model and hierarchical data model, based on that the main rela- tions of complex structural engineering objects are hierarchical in CAD application. First we give theformal definitions, then demonstrate that the sub-object relation on COHOR object set is a partial order lattice, and last discuss the basic rules about its operation. |
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| Keywords: | CAD engineering database complex object data model |
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