...实体/联系模型(Entity/Relationship Model) 联系的三种类型 设计原则 子类(Subclass) 对约束建模(Modeling of Constraint) 键码(Key) 引用完整性(Reference Integrity)
基于24个网页-相关网页
The density model in this depth is very much useful in the establishment of initial model and density space constraint for gravity modeling.
建立了这一深度空间内的密度模型,为利用重力场建模提供了初始模型和密度空间约束。
Object constraint language (OCL) is the sub-standard of UML, which can be used not only in constraint and query on models, but also in defining transformation rules and modeling language.
对象约束语言(ocl)被定义为uml标准的子标准,不仅可用于模型约束、查询,还可以用于定义模型转换规则和定义建模语言。
In this paper, the following tasks have been accomplished: (1) Analyzing the constraint relation of parts to accomplish Oriented Functional Relationship Graph (OFRG) assembly modeling.
在本文中完成了以下的工作:(1)通过分析装配体中零部件之间的约束关系,建立装配体的有向功能关系图(OFRG)装配模型。
应用推荐