A path expression is the result of navigation from a root expression via one or more persistent attribute ( s ). 路径表达式是通过一个或多个持久化属性从根表达式进行导航得到的结果。
A typesafe query API must enable your code to refer to the persistent attribute named age in a Person class in a way that a compiler can verify at compile time. 类型安全查询API必须让您的代码能够引用Person类中的持久化属性age,同时让编译器能够在编译期间检查错误。
Depending on this, the paper employs object-oriented persistent layer between the RDBMS and device management business design, take the CIM classes as example and presents an in-depth description of how to mapping OO elements such as class, attribute, OID, relationship, etc to RDBMS. 针对类、属性、OID、属性类型、关系等面向对象元素,结合CIM实例,深入地阐述了面向对象设计结果向关系型数据库映射的过程。