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.