Hibernate4之一对一映射关系(十一)

一对一映射关系

1.按照主键映射
2.按照外键映射

一、按照主键映射

1.编写hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!--数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>


        <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- 控制台显示SQL -->
        <property name="show_sql">true</property>

        <!-- 自动更新表结构 -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="com/newbeedaly/model/User.hbm.xml"/>
        <mapping resource="com/newbeedaly/model/Address.hbm.xml"/>

        <mapping resource="com/newbeedaly/model/User2.hbm.xml"/>
        <mapping resource="com/newbeedaly/model/Address2.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

2.编写HibernateUtil类

package com.newbeedaly.util;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil {

    private static final SessionFactory sessionFactory=buildSessionFactory();

    private static SessionFactory buildSessionFactory(){
        Configuration configuration=new Configuration().configure(); // 实例化配置文件
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); // 实例化服务登记
        return configuration.buildSessionFactory(serviceRegistry); // 获取Session工厂
    }

    public static SessionFactory getSessionFactory(){
        return sessionFactory;
    }
}

3.编写User.java和Address.java

package com.newbeedaly.model;

public class User {

    private int id;
    private String name;
    private Address address;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }


}

package com.newbeedaly.model;

public class Address {

    private int id;
    private String address;
    private String zipcode;
    private User user;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getZipcode() {
        return zipcode;
    }
    public void setZipcode(String zipcode) {
        this.zipcode = zipcode;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }


}

4.编写配置文件User.hbm.xml和Address.hbm.xml

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

<hibernate-mapping package="com.newbeedaly.model">

    <class name="User" table="t_user">
        <id name="id" column="userId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="userName"></property>

        <one-to-one name="address" class="com.newbeedaly.model.Address" cascade="all"></one-to-one>
    </class>

</hibernate-mapping>

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

<hibernate-mapping package="com.newbeedaly.model">

    <class name="Address" table="t_address">
        <id name="id" column="addressId">
            <generator class="foreign">
                <param name="property">user</param>
            </generator>
        </id>

        <property name="address" column="address"></property>
        <property name="zipcode" column="zipcode"></property>

        <one-to-one name="user" class="com.newbeedaly.model.User" constrained="true"></one-to-one>
    </class>

</hibernate-mapping>

5.编写测试类UserTest

package com.newbeedaly.service;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.newbeedaly.model.Address;
import com.newbeedaly.model.Address2;
import com.newbeedaly.model.User;
import com.newbeedaly.model.User2;
import com.newbeedaly.util.HibernateUtil;

public class UserTest {

    private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    private Session session;

    @Before
    public void setUp() throws Exception {
        session=sessionFactory.openSession(); // 生成一个session
        session.beginTransaction(); // 开启事务
    }

    @After
    public void tearDown() throws Exception {
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
    }

    @Test
    public void testSave1(){
        User user=new User();
        user.setName("张三");

        Address address=new Address();
        address.setAddress("某地方");
        address.setZipcode("43242");
        address.setUser(user);

        user.setAddress(address);
        session.save(user);
    }

    @Test
    public void testSave2(){
        User2 user=new User2();
        user.setName("李四");

        Address2 address=new Address2();
        address.setAddress("某地方2");
        address.setZipcode("432422");
        address.setUser(user);

        user.setAddress(address);
        session.save(user);
    }

}

二、按照外键映射

1.编写User2.java和Address2.java

package com.newbeedaly.model;

public class User2 {

    private int id;
    private String name;
    private Address2 address;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Address2 getAddress() {
        return address;
    }
    public void setAddress(Address2 address) {
        this.address = address;
    }


}

package com.newbeedaly.model;

public class Address2 {

    private int id;
    private String address;
    private String zipcode;
    private User2 user;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getZipcode() {
        return zipcode;
    }
    public void setZipcode(String zipcode) {
        this.zipcode = zipcode;
    }
    public User2 getUser() {
        return user;
    }
    public void setUser(User2 user) {
        this.user = user;
    }



}

2.编写配置文件User2.bhm.xml和Address2.hbm.xml

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

<hibernate-mapping package="com.newbeedaly.model">

    <class name="User2" table="t_user2">
        <id name="id" column="userId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="userName"></property>

        <many-to-one name="address" class="com.newbeedaly.model.Address2" column="addressId" cascade="all" unique="true"></many-to-one>
    </class>

</hibernate-mapping>

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

<hibernate-mapping package="com.newbeedaly.model">

    <class name="Address2" table="t_address2">
        <id name="id" column="addressId">
            <generator class="native">
            </generator>
        </id>

        <property name="address" column="address"></property>
        <property name="zipcode" column="zipcode"></property>

        <one-to-one name="user" class="com.newbeedaly.model.User2" property-ref="address"></one-to-one>
    </class>

</hibernate-mapping>