【摘要】 本文建立了分布式异构数据库的简单访问模型,对核心部分封装器的构造进行理论研究,引用集合的观点,分别对角色,权限及角色权限关系以等价类和函数映射的方法进行理论研究。实际中在数据库之上建立中间层封装器,提供统一的角色访问接口在中间层实现角色权限的对应数据表的转换,实现各数据库之间的角色权限访问。在此基础上对RBAC的互斥,职责分离,继承等性质做了一般的讨论。更多还原

【Abstract】 This paper build a simple DHD access model,discusses the construction of encapsulater which is core part in theory with set view,which include role,permission and relationship through the way of equivalent class and function mapping.The M-E(media-tor -encapsulater) is built above the database in fact and supplies uniform role access interface for exchanging data and realizing role permission access between databases. Further more RBAC’s properties of mutex,separation of duty and inheritance are dis-cussed in general.更多还原