Hibernate 4.0與之前的3.X版本改進很很多，下面先將改動的地方說一下。

1.資料庫方言設定

<property name=”dialect”>org.hibernate.dialect.MySQL5Dialect</property>

在3.3版本中連線MySQL資料庫只需要指明MySQLDialect即可。在4.1版本中可以指出MySQL5Dialect

2.buildSessionFactory

4.1版本中buildSessionFactory()已經被buildSessionFactory(ServiceRegistry ServiceRegistry)取代

解決辦法：

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

這個註解讀取配置的class已經廢棄，現在讀取配置不需要特別註明是註解，直接用Configuration cfg = new Configuration();就可以讀取註解。

Hibernate4.1版本中推薦使用annotation配置，所以在引進jar包時把requested裡面的包全部引進來就已經包含了annotation必須包了

由於Hibernate推薦使用註解，所以基於hbm的配置檔案我們就不寫了，而且對於新的server讀取配置檔案的方法建立session對於配置檔案的讀取貌似也有問題，我測試了好幾個都沒辦法解決，所以這裡先只介紹一下基於註解的方法了。

首先是配置檔案，這個在hibernate的mannual裡面可以找到

<?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>

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; }}

最後是使用他

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("中級");    Configuration cfg = new Configuration();  cfg.configure();//讀取配置檔案    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(); }}

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