内部表是在初始化ids时创建的。
此数据库是在第一次初始化数据库服务器时自动创建的，它包含一些使用有关已执行备份的信息填充的表。
This database is automatically created during the first initialization of the database server and contains several tables populated with information about the backups that have been performed.
这个特殊注册表是在发起到数据库的连接时用DFT_REFRESH_AGE数据库配置参数的值初始化的。
This special register is initialized with the value of the DFT_REFRESH_AGE database configuration parameter when the connection to the database is initiated.
对于第一个策略(每个子类一个表)，Hibernate每次初始化和填充对象时，会读取多个表。
For our first strategy (one table per subclass), Hibernate will read multiple tables each time an object is instantiated and populated.
理解并掌握当一个类的对象作为另一个类的数据成员时，利用初始化表调用构造函数的方法、构造函数的执行顺序。
Understand and grasp the object as a class to another class as data members, using initialization table call the constructor method, constructor execution order.
理解并掌握当一个类的对象作为另一个类的数据成员时，利用初始化表调用构造函数的方法、构造函数的执行顺序。
Understand and grasp the object as a class to another class as data members, using initialization table call the constructor method, constructor execution order.
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