Hibernate4学习（一）入门

    笔者的第一个hibernate框架应用入门例子 hibernate版本号是 4.3.11

1. hibernate核心配置文件hibernate.cfg.xml, 笔者将配置文件放在conf.hibernate包下，配置内容如下

   <?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://127.0.0.1:3306/lian?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;zeroDateTimeBehavior=convertToNull&amp;useSSL=false
           </property>
           <property name="connection.username">root</property>
           <property name="connection.password">root</property>
   		
           <!-- JDBC connection pool (use the built-in) -->
           <property name="connection.pool_size">5</property>
   		<!-- <property name="javax.persistence.validation.mode">none</property>  -->
   		
           <!-- SQL dialect -->
           <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</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="conf/hibernate/domain/Music.hbm.xml"/>
   
       </session-factory>
   
   </hibernate-configuration>

    
2. 实体类映射文件Music.hbm.xml，该配置文件放在conf.hibernate.domain路径下

   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE hibernate-mapping PUBLIC
           "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
           "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
   
   <hibernate-mapping package="org.lian.domain">
    	<class name="Music" table="t_music">
    		<id name="id" column="id">
    			<!-- id生成策略采用uuid -->
               <generator class="uuid"/>
           </id>
           <!-- 
            id;name;singer;album; duration; author; composer; style;
            
            id,name,singer,author,composer,album,duration,style
            -->
          <!--  <property name="date" type="timestamp" column="EVENT_DATE"/> -->
           <property name="name" column="name"/>
           <property name="singer" column="singer"/>
           <property name="author" column="author"/>
           <property name="composer" column="composer"/>
           <property name="album" column="album"/>
           <property name="duration" column="duration"/>
           <property name="style" column="style"/>
       </class>
   </hibernate-mapping>

    
3. 实体类org.lian.domain.Music.java

   public class Music {
   	private String id;
   	/**
   	 * 名称
   	 */
   	private String name;
   	/**
   	 * 歌手
   	 */
   	private String singer;
   	/**
   	 * 专辑
   	 */
   	private String album;
   	/**
   	 * 歌曲时长
   	 */
   	private String duration;
   	//作词
   	private String author;
   	//作曲
   	private String composer;
   	//风格
   	private String style;
   

    
4. hibernateUtil.java 根据配置文件Hibernate创建SessionFactory

   public class HibernateUtil {
   	private static final SessionFactory sessionFactory = buildSessionFactory();
   
   	private static SessionFactory buildSessionFactory() {
   		try {
   			// Create the SessionFactory from hibernate.cfg.xml
   			// return new
   			// Configuration().configure("/conf/hibernate/hibernate.cfg.xml")
   			// .buildSessionFactory(new StandardServiceRegistryBuilder().build());
   			Configuration configuration = new Configuration();
   			configuration.configure("/conf/hibernate/hibernate.cfg.xml");
   			ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
   					.applySettings(configuration.getProperties()).build();
   			SessionFactory sessionFactory = configuration
   					.buildSessionFactory(serviceRegistry);
   			return sessionFactory;
   
   		} catch (Throwable ex) {
   			// Make sure you log the exception, as it might be swallowed
   			System.err.println("Initial SessionFactory creation failed." + ex);
   			throw new ExceptionInInitializerError(ex);
   		}
   	}
   
   	public static SessionFactory getSessionFactory() {
   		return sessionFactory;
   	}
   
   }

    
5. 测试类Main.java

   public class Main {
   
   	public static void main(String[] args) {
   		// 获取session连接
   		Session session = HibernateUtil.getSessionFactory().getCurrentSession();
   		session.beginTransaction();
   		Music music = new Music();
   		music.setName("红色高跟鞋");
   		music.setAuthor("蔡健雅");
   		music.setSinger("蔡健雅");
   		music.setComposer("蔡健雅");
   		music.setAlbum("若你碰到他");
   		music.setDuration("03:26");
   		session.save(music);
   		session.getTransaction().commit();
   		// 关闭session工厂
   		HibernateUtil.getSessionFactory().close();
   	}
   }