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_bidirectional_1-1jointable

<?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.PersonManager" 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>
        <!-- 根据需要自动创建数据库 -->
        <property name="hbm2ddl.auto">update</property>
        <!-- 显示Hibernate持久化操作所生成的SQL -->
        <property name="show_sql">true</property>
        <!-- 将SQL脚本进行格式化后再输出 -->
        <property name="hibernate.format_sql">true</property>
        <!-- 罗列所有持久化类的类名 -->
        <mapping class="org.crazyit.app.domain.Person"/>
        <mapping class="org.crazyit.app.domain.Address"/>
    </session-factory>
</hibernate-configuration>

package org.crazyit.app.domain;

import java.util.*;

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 [email protected]
 * @version  1.0
 */
@Entity
@Table(name="address_inf")
public class Address
{
    // 标识属性
    @Id @Column(name="address_id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int addressId;
    // 定义地址详细信息的成员变量
    private String addressDetail;
    // 定义该Address实体关联的Person实体
    @OneToOne(targetEntity=Person.class)
    // 映射底层连接表，表名为person_address
    @JoinTable(name="person_address",
        // 映射连接表的外键列，增加unique=true表明是1-1关联
        joinColumns=@JoinColumn(name="address_id"
            , referencedColumnName="address_id", unique=true),
        // 映射连接表的外键列，增加unique=true表明是1-1关联
        inverseJoinColumns=@JoinColumn(name="person_id"
            , referencedColumnName="person_id" , unique=true)
    )
    private Person person;

    // 无参数的构造器
    public Address()
    {
    }
    // 初始化全部成员变量的构造器
    public Address(String addressDetail)
    {
        this.addressDetail = addressDetail;
    }

    // addressId的setter和getter方法
    public void setAddressId(int addressId)
    {
        this.addressId = addressId;
    }
    public int getAddressId()
    {
        return this.addressId;
    }

    // addressDetail的setter和getter方法
    public void setAddressDetail(String addressDetail)
    {
        this.addressDetail = addressDetail;
    }
    public String getAddressDetail()
    {
        return this.addressDetail;
    }

    // person的setter和getter方法
    public void setPerson(Person person)
    {
        this.person = person;
    }
    public Person getPerson()
    {
        return this.person;
    }
}

package org.crazyit.app.domain;

import java.util.*;

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 [email protected]
 * @version  1.0
 */
@Entity
@Table(name="person_inf")
public class Person
{
	// 标识属性
	@Id @Column(name="person_id")
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Integer id;
	private String name;
	private int age;
	// 定义该Person实体关联的Address实体
	@OneToOne(targetEntity=Address.class)
	// 映射底层连接表，表名为person_address
	@JoinTable(name="person_address",
		// 映射连接表的外键列，增加unique=true表明是1-1关联
		joinColumns=@JoinColumn(name="person_id"
			, referencedColumnName="person_id" , unique=true),
		// 映射连接表的外键列，增加unique=true表明是1-1关联
		inverseJoinColumns=@JoinColumn(name="address_id"
			, referencedColumnName="address_id", unique=true)
	)
	private Address address;

	// id的setter和getter方法
	public void setId(Integer id)
	{
		this.id = id;
	}
	public Integer getId()
	{
		return this.id;
	}

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

	// age的setter和getter方法
	public void setAge(int age)
	{
		this.age = age;
	}
	public int getAge()
	{
		return this.age;
	}

	// address的setter和getter方法
	public void setAddress(Address address)
	{
		this.address = address;
	}
	public Address getAddress()
	{
		return this.address;
	}
}

　　

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 [email protected]
 * @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 lee;

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

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

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 [email protected]
 * @version  1.0
 */
public class PersonManager
{
    public static void main(String[] args)
    {
        PersonManager mgr = new PersonManager();
        mgr.testPerson();
        HibernateUtil.sessionFactory.close();
    }

    private void testPerson()
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction();
        // 创建一个瞬态的Person对象
        Person p = new Person();
        // 设置Person的name为crazyit字符串
        p.setName("crazyit");
        p.setAge(21);
        // 创建一个瞬态的Address对象
        Address a = new Address("广州天河");
        // 设置Person和Address之间的关联关系
//        p.setAddress(a);
        a.setPerson(p);
        // 持久化Address对象
        session.persist(a);
        // 持久化Person对象
        session.save(p);
        tx.commit();
        HibernateUtil.closeSession();
    }
}