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
<property name=”dialect”>org.hibernate.dialect.MySQL5Dialect</property>
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
<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/test</property> <property name="connection.username">sa</property> <property name="connection.password">sa</property> <!-- JDBC connection pool (use the built-in) <property name="connection.pool_size">1</property> --> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <!-- Enable Hibernate's automatic session context management <property name="current_session_context_class">thread</property> --> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup <property name="hbm2ddl.auto">update</property> --> <!-- <mapping resource="com/bird/model/Student.hbm.xml"/> --> <mapping class="com.bird.model.Teacher"/> </session-factory></hibernate-configuration>然后是具体的类
package com.bird.model;import javax.persistence.Entity;import javax.persistence.Id;@Entitypublic class Teacher { private int id; private String name; private String title; @Id public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; }}其中的表名和类名相同，其他的字段和Bean的属相相同。
最后是使用他
package com.bird.test;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;import com.bird.model.Teacher;public class TeacherTest { /** * @param args */ public static void main(String[] args) { Teacher t = new Teacher(); t.setId(1); t.setName("t1"); t.setTitle("中级"); Configuration cfg = new Configuration(); cfg.configure();//读取配置文件 ServiceRegistry serviceRegistry =new ServiceRegistryBuilder(). applySettings(cfg.getProperties()).buildServiceRegistry(); SessionFactory factory = cfg.configure().buildSessionFactory(serviceRegistry); Session session = factory.openSession(); session.beginTransaction(); session.save(t); session.getTransaction().commit(); session.close(); factory.close(); }}这样基于最新的hibernate4.1.1的helloworld就OK了
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