Hibernate 4.1.1的第一个例子HelloWorld
Hibernate 4.0与之前的3.X版本改进很很多，下面先将改动的地方说一下。1.数据库方言设置lt;property name=rdquo;dialectrdquo
Hibernate 4.0与之前的3.X版本改进很很多，下面先将改动的地方说一下。
1.数据库方言设置
在3.3版本中连接MySQL数据库只需要指明MySQLDialect即可。在4.1版本中可以指出MySQL5Dialect
2.buildSessionFactory
4.1版本中buildSessionFactory()已经被buildSessionFactory(ServiceRegistry ServiceRegistry)取代
解决办法：
Configuration cfg = new Configuration();
cfg.configure();
ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
SessionFactory sf = cfg.configure().buildSessionFactory(serviceRegistry);
3.annotation
org.hibernate.cfg.AnnotationConfiguration;
Deprecated. All functionality has been moved to Configuration
这个注解读取配置的class已经废弃，，现在读取配置不需要特别注明是注解，直接用Configuration cfg = new Configuration();就可以读取注解。
Hibernate4.1版本中推荐使用annotation配置，所以在引进jar包时把requested里面的包全部引进来就已经包含了annotation必须包了
由于Hibernate推荐使用注解，所以基于hbm的配置文件我们就不写了，而且对于新的server读取配置文件的方法建立session对于配置文件的读取貌似也有问题，我测试了好几个都没办法解决，所以这里先只介绍一下基于注解的方法了。
首先是配置文件，这个在hibernate的mannual里面可以找到
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