Hibernate 3.0 HelloWorld

说明

基于Hibernate 3.0，Mysql5.0，java jdk 1.7，运行需要的lib 库，从http://files.cnblogs.com/HCCZX/Hibernate_Lib.rar  下载。
下面开始一步步写代码

1.创建数据库

drop database if exists SAMPLEDB;
create database SAMPLEDB;
use SAMPLEDB;

create table CUSTOMERS (
  ID bigint not null primary key,
  NAME varchar(15) not null,
  EMAIL varchar(128) not null,
  PASSWORD varchar(8) not null,
  PHONE int ,
  ADDRESS varchar(255),
  SEX char(1) ,
  IS_MARRIED bit,
  DESCRIPTION text,
  IMAGE blob,
  BIRTHDAY date,
  REGISTERED_TIME timestamp
);

2.添加java  VO 对象，也叫 pojo,javabean，不知为啥这么多个叫法。

package mypack;

import java.io.Serializable;
import java.sql.Date;
import java.sql.Timestamp;

public class Customer implements Serializable {
    private static final long serialVersionUID = 1L;
    private Long id;
    private String name;
    private String email;
    private String password;
    private int phone;
    private String address;
    private char sex;
    private boolean married;
    private String description;
    private byte[] image;
    private Date birthday;
    private Timestamp registeredTime;

    public Customer() {
    }

    public Long getId() {
        return id;
    }

    @SuppressWarnings("unused")
    private void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getPhone() {
        return phone;
    }

    public void setPhone(int phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public char getSex() {
        return sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }

    public boolean isMarried() {
        return married;
    }

    public void setMarried(boolean married) {
        this.married = married;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public byte[] getImage() {
        return this.image;
    }

    public void setImage(byte[] image) {
        this.image = image;
    }

    public Date getBirthday() {
        return this.birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Timestamp getRegisteredTime() {
        return this.registeredTime;
    }

    public void setRegisteredTime(Timestamp registeredTime) {
        this.registeredTime = registeredTime;
    }

}

3.添加Hibernate 对象关系映射文件

<?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.Customer" table="CUSTOMERS">

    <id name="id" column="ID" type="long">
      <generator class="increment"/>
    </id>
    <property name="name"  column="NAME"  type="string" not-null="true" />
    <property name="email"     column="EMAIL"     type="string" not-null="true" />
    <property name="password"  column="PASSWORD"  type="string" not-null="true"/>
    <property name="phone"     column="PHONE"     type="int" />
    <property name="address"   column="ADDRESS"   type="string" />
    <property name="sex"       column="SEX"       type="character"/>
    <property name="married"   column="IS_MARRIED"  type="boolean"/>
    <property name="description"   column="DESCRIPTION"  type="text"/>
    <property name="image"         column="IMAGE"        type="binary"/>
    <property name="birthday"      column="BIRTHDAY"     type="date"/>
    <property name="registeredTime" column="REGISTERED_TIME"  type="timestamp"/>  

  </class>

</hibernate-mapping>

4.添加Hibernate  配置文件 hibernate.properties

hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.connection.driver_class=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://localhost:3306/SAMPLEDB
hibernate.connection.username=root
hibernate.connection.password=aaaaaa
hibernate.show_sql=true

5.添加底层操作代码

package mypack;

import javax.servlet.*;

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

import java.io.*;
import java.sql.Date;
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Customer类的对象-关系映射文件
      config.addClass(Customer.class);
      // 创建SessionFactory实例 */
      sessionFactory = config.buildSessionFactory();
    }catch(RuntimeException e){e.printStackTrace();throw e;}
  }

  /** 查询所有的Customer对象，然后调用printCustomer()方法打印Customer对象信息 */
  public void findAllCustomers(ServletContext context,PrintWriter out) throws Exception{
    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 Customer as c order by c.name asc");
      @SuppressWarnings("unchecked")
       List<Customer> customers=query.list();
      for (Iterator<Customer> it = customers.iterator(); it.hasNext();) {
         printCustomer(context,out,it.next());
      }

      tx.commit(); //提交事务

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

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

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

  /** 按照OID加载一个Customer对象，然后修改它的属性 */
  public void loadAndUpdateCustomer(Long customer_id,String address){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try {
      tx = session.beginTransaction();

      Customer c=(Customer)session.get(Customer.class,customer_id);
      c.setAddress(address);
      tx.commit();

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

  /**删除Customer对象 */
  public void deleteCustomer(Customer customer){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try {
      tx = session.beginTransaction();
      session.delete(customer);
      tx.commit();

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

  /** 选择向控制台还是Web网页输出Customer对象的信息 */
  private void printCustomer(ServletContext context,PrintWriter out,Customer customer)throws Exception{
     if(context!=null)
       printCustomerInWeb(context,out,customer);
     else
       printCustomer( out,customer);
  }

  /** 把Customer对象的信息输出到控制台，如DOS 控制台*/
  private void printCustomer(PrintWriter out,Customer customer)throws Exception{
    byte[] buffer=customer.getImage();
    FileOutputStream fout=new FileOutputStream("photo_copy.gif");
    fout.write(buffer);
    fout.close();

    out.println("------以下是"+customer.getName()+"的个人信息------");
    out.println("ID: "+customer.getId());
    out.println("口令: "+customer.getPassword());
    out.println("E-Mail: "+customer.getEmail());
    out.println("电话: "+customer.getPhone());
    out.println("地址: "+customer.getAddress());
    String sex=customer.getSex()=='M'? "男":"女";
    out.println("性别: "+sex);
    String marriedStatus=customer.isMarried()? "已婚":"未婚";
    out.println("婚姻状况: "+marriedStatus);
    out.println("生日: "+customer.getBirthday());
    out.println("注册时间: "+customer.getRegisteredTime());
    out.println("自我介绍: "+customer.getDescription());

  }

  /** 把Customer对象的信息输出到动态网页 */
  private void printCustomerInWeb(ServletContext context,PrintWriter out,Customer customer)throws Exception{
    //保存照片
    byte[] buffer=customer.getImage();
    String path=context.getRealPath("/");
    FileOutputStream fout=new FileOutputStream(path+"photo_copy.gif");
    fout.write(buffer);
    fout.close();

    out.println("------以下是"+customer.getName()+"的个人信息------"+"<br>");
    out.println("ID: "+customer.getId()+"<br>");
    out.println("口令: "+customer.getPassword()+"<br>");
    out.println("E-Mail: "+customer.getEmail()+"<br>");
    out.println("电话: "+customer.getPhone()+"<br>");
    out.println("地址: "+customer.getAddress()+"<br>");
    String sex=customer.getSex()=='M'? "男":"女";
    out.println("性别: "+sex+"<br>");
    String marriedStatus=customer.isMarried()? "已婚":"未婚";
    out.println("婚姻状况: "+marriedStatus+"<br>");
    out.println("生日: "+customer.getBirthday()+"<br>");
    out.println("注册时间: "+customer.getRegisteredTime()+"<br>");
    out.println("自我介绍: "+customer.getDescription()+"<br>");
    out.println("<img src='photo_copy.gif' border=0><p>");
  }
   public void test(ServletContext context,PrintWriter out) throws Exception{

    Customer customer=new Customer();
    customer.setName("Tom");
    customer.setEmail("tom@yahoo.com");
    customer.setPassword("1234");
    customer.setPhone(55556666);
    customer.setAddress("Shanghai");
    customer.setSex('M');
    customer.setDescription("I am very honest.");

    //设置Customer对象的image属性，它是字节数组，存放photo.gif文件中的二进制数据
    //photo.gif文件和BusinessService.class文件位于同一个目录下
    InputStream in=this.getClass().getResourceAsStream("photo.gif");
    byte[] buffer = new byte[in.available()];
    in.read(buffer);
    customer.setImage(buffer);
    //设置Customer对象的birthday属性，它是java.sql.Date类型
    customer.setBirthday(Date.valueOf("1980-05-06"));

    saveCustomer(customer);

    findAllCustomers(context,out);
    loadAndUpdateCustomer(customer.getId(),"Beijing");
    findAllCustomers(context,out);
    deleteCustomer(customer);
  }

  public static void main(String args[]) throws Exception {
    new BusinessService().test(null,new PrintWriter(System.out,true));
    sessionFactory.close();

  }
}