本文介绍了Hibernate框架，这是一种对象持久化技术，允许程序员以面向对象的方式操作数据库。它封装了不同数据库的底层细节，使得可以通过相同的API操作不同的数据库类型。通过Configuration类使用配置文件hibernate.cfg.xml和映射文件*.hbm.xml创建SessionFactory，进而创建Session实例，进行数据库的增删改查等操作。
as is well known, Hibernate framework is an object persistent technology which let programmers operate database in object oriented method, it encapsulate the lower level details of different databases .it is easy to use the same API to perform different kind of databases.
sure thing, the configuration file hibernate.cfg.hbm or mapping files **.hbm.xml are used by the Configuration class to create SessionFactory which in turn creates Session instance. Session class are the primary of the persistent service class.via Session
class, we can do create ,delete ,update, query etc commands to operate the database
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