吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：Hibernate_1-N(entity-id)

<?xml version="1.0" encoding="GBK"?>
<project name="hibernate" basedir="." default="">
    <property name="src" value="src"/>
    <property name="dest" value="classes"/>

    <path id="classpath">
        <fileset dir="../../lib">
            <include name="**/*.jar"/>
        </fileset>
        <pathelement path="${dest}"/>
    </path>

    <target name="compile" description="Compile all source code">
        <delete dir="${dest}"/>
        <mkdir dir="${dest}"/>
        <copy todir="${dest}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>        
        </copy>
        <javac destdir="${dest}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src}"/>
            <classpath refid="classpath"/>
            <compilerarg value="-Xlint:deprecation"/>
        </javac>
    </target>

    <target name="run" description="Run the main class" depends="compile">
        <java classname="lee.OrderManager" fork="yes" failonerror="true">
            <classpath refid="classpath"/>
        </java>
    </target>

</project>

<?xml version="1.0" encoding="GBK"?>
<!-- 指定Hibernate配置文件的DTD信息 -->
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<!-- hibernate-configuration是配置文件的根元素 -->
<hibernate-configuration>
    <session-factory>
        <!-- 指定连接数据库所用的驱动 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- 指定连接数据库的url，其中hibernate是本应用连接的数据库名 -->
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <!-- 指定连接数据库的用户名 -->
        <property name="connection.username">root</property>
        <!-- 指定连接数据库的密码 -->
        <property name="connection.password">32147</property>
        <!-- 指定连接池里最大连接数 -->
        <property name="hibernate.c3p0.max_size">20</property>
        <!-- 指定连接池里最小连接数 -->
        <property name="hibernate.c3p0.min_size">1</property>
        <!-- 指定连接池里连接的超时时长 -->
        <property name="hibernate.c3p0.timeout">5000</property>
        <!-- 指定连接池里最大缓存多少个Statement对象 -->
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.validate">true</property>
        <!-- 指定数据库方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <property name="hibernate.format_sql">true</property>
        <property name="hibernate.show_sql">true</property>
        <!-- 根据需要自动创建数据库 -->
        <property name="hbm2ddl.auto">update</property>
        <!-- 罗列所有持久化类的类名 -->
        <mapping class="org.crazyit.app.domain.Order"/>
        <mapping class="org.crazyit.app.domain.OrderItem"/>
        <mapping class="org.crazyit.app.domain.Product"/>
    </session-factory>
</hibernate-configuration>

package lee;

import org.hibernate.Transaction;
import org.hibernate.Session;

import java.util.*;
import org.crazyit.app.domain.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class OrderManager
{
    public static void main(String[] args)
    {
        OrderManager mgr = new OrderManager();
        mgr.createAndStoreOrder();
        HibernateUtil.sessionFactory.close();
    }
    private void createAndStoreOrder()
    {
        Session sess = HibernateUtil.currentSession();
        Transaction tx = sess.beginTransaction();

        Order order = new Order(new Date());
        Product p1 = new Product("键盘");
        Product p2 = new Product("显示器");
        OrderItem item1 = new OrderItem(order , p1 , 50);
        OrderItem item2 = new OrderItem(order , p2 , 18);

        sess.save(order);
        sess.save(p1);
        sess.save(p2);
        sess.save(item1);
        sess.save(item2);

        tx.commit();
        HibernateUtil.closeSession();
    }
}

package lee;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.service.*;
import org.hibernate.boot.registry.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class HibernateUtil
{
    public static final SessionFactory sessionFactory;

    static
    {
        try
        {
            // 使用默认的hibernate.cfg.xml配置文件创建Configuration实例
            Configuration cfg = new Configuration()
                .configure();
            // 以Configuration实例来创建SessionFactory实例
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                .applySettings(cfg.getProperties()).build();
            sessionFactory = cfg.buildSessionFactory(serviceRegistry);
        }
        catch (Throwable ex)
        {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    // ThreadLocal可以隔离多个线程的数据共享，因此不再需要对线程同步
    public static final ThreadLocal<Session> session
        = new ThreadLocal<Session>();

    public static Session currentSession()
        throws HibernateException
    {
        Session s = session.get();
        // 如果该线程还没有Session,则创建一个新的Session
        if (s == null)
        {
            s = sessionFactory.openSession();
            // 将获得的Session变量存储在ThreadLocal变量session里
            session.set(s);
        }
        return s;
    }

    public static void closeSession()
        throws HibernateException
    {
        Session s = session.get();
        if (s != null)
            s.close();
        session.set(null);
    }
}

package org.crazyit.app.domain;

import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@Entity
@Table(name="order_inf")
public class Order
{
    // 定义标识属性
    @Id @Column(name="order_id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer orderId;
    private Date orderDate;
    // 关联的的订单项
    @OneToMany(targetEntity=OrderItem.class, mappedBy="order")
    private Set<OrderItem> items
        = new HashSet<>();

    // 无参数的构造器
    public Order(){}

    // 初始化全部成员变量的构造器
    public Order(Date orderDate)
    {
        this.orderDate = orderDate;
    }

    // orderId的setter和getter方法
    public void setOrderId(Integer orderId)
    {
        this.orderId = orderId;
    }
    public Integer getOrderId()
    {
        return this.orderId;
    }

    // orderDate的setter和getter方法
    public void setOrderDate(Date orderDate)
    {
        this.orderDate = orderDate;
    }
    public Date getOrderDate()
    {
        return this.orderDate;
    }

    // items的setter和getter方法
    public void setItems(Set<OrderItem> items)
    {
        this.items = items;
    }
    public Set<OrderItem> getItems()
    {
        return this.items;
    }
}

package org.crazyit.app.domain;

import javax.persistence.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@Entity
@Table(name="order_item_inf")
public class OrderItem
    implements java.io.Serializable
{
    // 下面3个属性将作为联合主键
    // 定义关联的Order实体
    @ManyToOne(targetEntity=Order.class)
    // 映射名为order_id的外键列，参照order_inf的order_id主键列
    @JoinColumn(name="order_id" , referencedColumnName="order_id")
    @Id
    private Order order;
    // 定义关联的Product实体
    @ManyToOne(targetEntity=Product.class)
    // 映射名为product_id的外键列，参照product_inf的product_id主键列
    @JoinColumn(name="product_id" , referencedColumnName="product_id")
    @Id
    private Product product;
    // 该订单项订购的产品数量
    @Id
    private int count;

    // 无参数的构造器
    public OrderItem(){ }
    // 初始化全部成员变量的构造器
    public OrderItem(Order order , Product product , int count)
    {
        this.order = order;
        this.product = product;
        this.count = count;
    }

    // order的setter和getter方法
    public void setOrder(Order order)
    {
        this.order = order;
    }
    public Order getOrder()
    {
        return this.order;
    }

    // product的setter和getter方法
    public void setProduct(Product product)
    {
        this.product = product;
    }
    public Product getProduct()
    {
        return this.product;
    }

    // count的setter和getter方法
    public void setCount(int count)
    {
        this.count = count;
    }
    public int getCount()
    {
        return this.count;
    }
    // 重写equals()方法，根据product、order、count判断是否相等
    public boolean equals(Object obj)
    {
        if(this == obj)
        {
            return true;
        }
        if(obj != null && obj.getClass() == OrderItem.class)
        {
            OrderItem target = (OrderItem)obj;
            return this.order.equals(target.getOrder())
                && this.product.equals(target.getProduct())
                && this.count == target.getCount();
        }
        return false;
    }
    // 重写hashCode()方法，根据product、order、count计算hashCode值
    public int hashCode()
    {
        return (this.product == null ? 0 : this.product.hashCode()) * 31 * 31
            + (this.order == null ? 0 : this.order.hashCode()) * 31
            + this.count;
    }
}

package org.crazyit.app.domain;

import javax.persistence.*;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@Entity
@Table(name="product_inf")
public class Product
{
    // 定义标识属性
    @Id @Column(name="product_id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer productId;
    private String name;

    // 无参数的构造器
    public Product(){}
    // 初始化全部属性的构造器
    public Product(String name)
    {
        this.name = name;
    }

    // productId的setter和getter方法
    public void setProductId(Integer productId)
    {
        this.productId = productId;
    }
    public Integer getProductId()
    {
        return this.productId;
    }

    // name的setter和getter方法
    public void setName(String name)
    {
        this.name = name;
    }
    public String getName()
    {
        return this.name;
    }
}