Hibernate逍遥游记-第2章-使用hibernate.properties

1.

 package mypack;

 import org.hibernate.*;
 import org.hibernate.cfg.Configuration;
 import java.util.*;

 public class BusinessService{
   public static SessionFactory sessionFactory;

   /** 初始化Hibernate，创建SessionFactory实例 */
   static{
     try{
       // 根据默认位置的Hibernate配置文件的配置信息，创建一个Configuration实例
       Configuration config = new Configuration();
       //加载Monkey类的对象-关系映射文件
       config.addClass(Monkey.class);
       // 创建SessionFactory实例
       sessionFactory = config.buildSessionFactory();
       SessionFactory sessionFactory2 = config.buildSessionFactory();
       System.out.println("---------->"+(sessionFactory2==sessionFactory));

     }catch(RuntimeException e){e.printStackTrace();throw e;}
   }

   /** 查询所有的Monkey对象，然后打印Monkey对象信息 */
   public void findAllMonkeys(){
     Session session = sessionFactory.openSession(); //创建一个会话
     Transaction tx = null;
     try {
       tx = session.beginTransaction(); //开始一个事务
       Query query=session.createQuery("from Monkey as m order by m.name asc");
       List monkeys=query.list();
       for (Iterator it = monkeys.iterator(); it.hasNext();) {
         Monkey monkey=(Monkey) it.next();
         System.out.println("ID="+monkey.getId()
          +",姓名="+monkey.getName()
          +",年龄="+monkey.getAge()
          +",性别="+(monkey.getGender()=='M'?"公猴":"母猴"));
       }

       tx.commit(); //提交事务

     }catch (RuntimeException e) {
       if (tx != null) {
          tx.rollback();
       }
       throw e;
     } finally {
        session.close();
     }
   }

   /** 持久化一个Monkey对象 */
   public void saveMonkey(Monkey monkey){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       session.save(monkey);
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   /** 按照OID加载一个Monkey对象，然后修改它的属性 */
   public void loadAndUpdateMonkey(Long monkey_id,int age){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();

       Monkey m=(Monkey)session.get(Monkey.class,monkey_id);
       m.setAge(age);
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   /**删除Monkey对象 */
   public void deleteMonkey(Monkey monkey){
     Session session = sessionFactory.openSession();
     Transaction tx = null;
     try {
       tx = session.beginTransaction();
       session.delete(monkey);
       tx.commit();

     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   public void test(){
     Monkey monkey=new Monkey();
     monkey.setName("智多星");
     monkey.setAge(1);
     monkey.setGender('M');

     saveMonkey(monkey);

     findAllMonkeys();
     loadAndUpdateMonkey(monkey.getId(),2);
     findAllMonkeys();
     deleteMonkey(monkey);
     findAllMonkeys();
   }

   public static void main(String args[]){
     new BusinessService().test();
     sessionFactory.close();
   }
 }

2.

 <?xml version="1.0"?>
 <!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

 <hibernate-mapping>
   <class name="mypack.Monkey" table="MONKEYS">

     <id name="id" column="ID" type="long">
       <generator class="increment"/>
     </id>
     <property name="name"  column="NAME"  type="string" not-null="true" />
     <property name="age"     column="AGE"     type="int" />
     <property name="gender"  column="GENDER"       type="character"/>
   </class>

 </hibernate-mapping>

3.

 hibernate.dialect=org.hibernate.dialect.MySQLDialect
 hibernate.connection.driver_class=com.mysql.jdbc.Driver
 hibernate.connection.url=jdbc:mysql://localhost:3306/SAMPLEDB?useUnicode=true&characterEncoding=GBK
 hibernate.connection.username=root
 hibernate.connection.password=1234
 hibernate.show_sql=true

4.