hibernate原理：Hibernate 是一个开放源代码的对象关系映射框架，它对 JDBC 进行了轻量级的对象封装，使 Java 程序员可以随心所欲的使用对象编程思维来操纵数据库。-hibernate works: Hibernate is an open source object-relational mapping framework, it was lightweight JDBC object package so that Java programmers can use arbitrary object programming thinking to manipulate the database.