一对一关联关系实例

项目的文件结构：

HibernateSessionFactory.java

package addHibFile;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.omg.CORBA.PRIVATE_MEMBER;
import org.hibernate.HibernateException;

public class HibernateSessionFactory {
	private static String CONFIG_FILE_LOCATION="/hibernate.cfg.xml";
	private HibernateSessionFactory() {
		
	}
	private static final ThreadLocal threadLocal=new ThreadLocal();
	private static final Configuration cfg=new Configuration();
	private static SessionFactory sessionFactory;
	public static Session currentSession() throws HibernateException{
		Session session=(Session)threadLocal.get();
		if(session==null) {
			if(sessionFactory==null) {
				try {
					cfg.configure(CONFIG_FILE_LOCATION);
					sessionFactory=cfg.buildSessionFactory();
				}
				catch (Exception e) {
					// TODO: handle exception
					System.out.println("生成SessionFactory失败！！！");
					e.printStackTrace();
				}
			}
			session=sessionFactory.openSession();
			threadLocal.set(session);
		}
		return session;
	}
	
	public static void closeSession() throws HibernateException{
		Session session=(Session)threadLocal.get();
		threadLocal.set(null);
		if(session!=null) {
			session.close();
		}
	}
}

OneOneDAO.java

package DAO;
import addHibFile.HibernateSessionFactory;
import org.hibernate.*;
import PO.*;

public class OneOneDAO {
	//添加会员的方法
	public void addCompany(Company company) {
		Session session=HibernateSessionFactory.currentSession();
		Transaction ts=null;
		try {
			ts=session.beginTransaction();
			session.save(company);
			ts.commit();
		}catch (Exception e) {
			// TODO: handle exception
			ts.rollback();
			System.out.println("系统错误：在OneOneDAO的addCompany方法中出错：");
			e.printStackTrace();
		}finally {
			HibernateSessionFactory.closeSession();
		}
	}
	
	//获取会员信息
	public Company loadCompany(Integer id) {
		Session session=HibernateSessionFactory.currentSession();
		Transaction ts=null;
		Company company=null;
		try {
			ts=session.beginTransaction();
			company=(Company)session.get(Company.class, id);
			ts.commit();
		}catch (Exception e) {
			// TODO: handle exception
			ts.rollback();
			System.out.println("系统错误：在OneOneDAO中的loadCompany方法出错：");
			e.printStackTrace();
		}finally {
			HibernateSessionFactory.closeSession();
		}
		return company;
	}
	
	//添加客户信息
	public void addClient(Client client) {
		Session session=HibernateSessionFactory.currentSession();
		Transaction ts=null;
		try {
			ts=session.beginTransaction();
			session.save(client);
			ts.commit();
		}catch (Exception e) {
			// TODO: handle exception
			ts.rollback();
			System.out.println("系统错误：在OneOneDAO中的addClient方法中出错：");
			e.printStackTrace();
		}finally {
			HibernateSessionFactory.closeSession();
		}
	}
	
	//获取客户信息
	public Client loadClient(Integer id) {
		Session session=HibernateSessionFactory.currentSession();
		Transaction ts=null;
		Client client=null;
		try {
			ts=session.beginTransaction();
			client=(Client)session.get(Client.class, id);
			ts.commit();
		}catch (Exception e) {
			// TODO: handle exception
			ts.rollback();
			System.out.println("系统错误：在OneOneDAO中loadClient方法中出错：");
			e.printStackTrace();
		}finally {
			HibernateSessionFactory.closeSession();
		}
		return client;
	}
}

Address.java

package PO;
import java.io.Serializable;

public class Address implements Serializable{
	private Integer id;
	private String province;			//省份
	private String city;				//城市
	private String street;				//街道
	private String zipcode;				//邮编
	private Client client;				//关联另外一个类
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getProvince() {
		return province;
	}
	public void setProvince(String province) {
		this.province = province;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getStreet() {
		return street;
	}
	public void setStreet(String street) {
		this.street = street;
	}
	public String getZipcode() {
		return zipcode;
	}
	public void setZipcode(String zipcode) {
		this.zipcode = zipcode;
	}
	public Client getClient() {
		return client;
	}
	public void setClient(Client client) {
		this.client = client;
	}
	
}

Address.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- 解析文件的DTD -->
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
	<!-- 映射文件的根目录 -->
	<hibernate-mapping package="PO">
		<class name="Address" table="address">
			<id column="ID" name="id" type="integer">
				<generator class="identity"></generator>
			</id>
			<property name="province" column="PROVINCE" type="string"></property>
			<property name="city" column="CITY" type="string"></property>
			<property name="street" column="STREET" type="string"></property>
			<property name="zipcode" column="ZIPCODE" type="string"></property>
			<!-- 映射Client与Address的一对一外键关联 -->
			<one-to-one name="Client" class="PO.Client" property-ref="address"></one-to-one>
		</class>
	</hibernate-mapping>

Client.java

package PO;
import java.io.Serializable;

public class Client implements Serializable{
	private Integer id;
	private String clientname;			//客户名称
	private String phone;				//客户电话
	private String email;				//客户邮箱
	private Address address;			//关联另外一个PO
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getClientname() {
		return clientname;
	}
	public void setClientname(String clientname) {
		this.clientname = clientname;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Address getAddress() {
		return address;
	}
	public void setAddress(Address address) {
		this.address = address;
	}
	
}

cliemt.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- 解析文件的DTD -->
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
	<!-- 映射文件的根目录 -->
	<hibernate-mapping package="PO">
		<class name="Client" table="client">
			<id column="ID" name="id" type="integer">
				<generator class="identity"></generator>
			</id>
			<property column="CLIENTNAME" name="clientname" type="string"></property>
			<property column="PHONE" name="phone" type="string"></property>
			<property column="EMAIL" name="email" type="string"></property>
			<!-- 映射Client到Address的一对一外键关联，唯一的多对一，实际上变成了一对一关系 -->
			<many-to-one name="address" class="PO.Address" column="address" cascade="all"
				lazy="false" unique="true"></many-to-one>
		</class>
	</hibernate-mapping>

Company.java

package PO;
import java.io.Serializable;

public class Company implements Serializable{
	private Integer id;					
	private String companyname;			//单位名称
	private String linkman;				//单位联系人
	private String telephone;			//联系电话
	private String email;				//邮箱
	private Login login;				//关联另外一个类，即Login类
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getCompanyname() {
		return companyname;
	}
	public void setCompanyname(String companyname) {
		this.companyname = companyname;
	}
	public String getLinkman() {
		return linkman;
	}
	public void setLinkman(String linkman) {
		this.linkman = linkman;
	}
	public String getTelephone() {
		return telephone;
	}
	public void setTelephone(String telephone) {
		this.telephone = telephone;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Login getLogin() {
		return login;
	}
	public void setLogin(Login login) {
		this.login = login;
	}
	
}

Company.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- 解析文件的DTD -->
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
	<!-- 映射文件的根目录 -->
	<hibernate-mapping package="PO">
		<class name="Company" table="company">
			<id column="ID" name="id" type="integer">
				<!-- 自增 -->
				<generator class="identity"></generator>
			</id>
			<property name="companyname" column="COMPANYNAME" type="string"></property>
			<property name="linkman" column="LINKMAN" type="string"></property>
			<property name="telephone" column="TELEPHONE" type="string"></property>
			<property name="email" column="EMAIL" type="string"></property>
			<!-- 映射Company与Login的一对一主键关联 -->
			<one-to-one name="login" cascade="all" class="PO.Login" lazy="false" fetch="join"
				outer-join="true"></one-to-one>
		</class>
	</hibernate-mapping>

Login.java

package PO;
import java.io.Serializable;

public class Login implements Serializable{
	private Integer id;				
	private String loginname;		//登陆账号
	private String loginpwd;		//登陆密码
	private Company company;		//关联另外一个类Company
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getLoginname() {
		return loginname;
	}
	public void setLoginname(String loginname) {
		this.loginname = loginname;
	}
	public String getLoginpwd() {
		return loginpwd;
	}
	public void setLoginpwd(String loginpwd) {
		this.loginpwd = loginpwd;
	}
	public Company getCompany() {
		return company;
	}
	public void setCompany(Company company) {
		this.company = company;
	}
	
}

Login.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- 解析文件的DTD -->
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
	<!-- 映射文件的根目录 -->
	<hibernate-mapping package="PO">
		<class name="Login" table="login">
			<id column="ID" name="id" type="integer">
				<generator class="foreign">
					<param name="property">company</param>
				</generator>
			</id>
			<property name="loginname" column="LOGINNAME" type="string"></property>
			<property name="loginpwd" column="LOGINPWD" type="string"></property>
			<!-- 映射Company与Login的一对一关联 -->
			<one-to-one name="company" class="PO.Company" constrained="true"></one-to-one>
		</class>
	</hibernate-mapping>

TextBean.java

package text;
import PO.*;
import DAO.OneOneDAO;

public class TextBean {
	OneOneDAO dao=new OneOneDAO();
	
	//添加会员信息
	public void addCompany() {
		Company company=new Company();
		Login login=new Login();
		login.setLoginname("QQ");
		login.setLoginpwd("123");
		company.setCompanyname("清华大学出版设");
		company.setLinkman("某某某");
		company.setTelephone("123456754");
		company.setEmail("1234543qq.com");
		//持久化对象之间相互设置关联关系
		login.setCompany(company);
		company.setLogin(login);
		dao.addCompany(company);
	}
	
	//获取会员信息
	public Company loadCompany(Integer id) {
		return dao.loadCompany(id);
	}
	
	//添加客户信息
	public void addClient() {
		Client client=new Client();
		Address address=new Address();
		address.setCity("杭州");
		address.setProvince("杭州市");
		address.setStreet("红枫街道");
		address.setZipcode("100324");
		client.setClientname("hjw");
		client.setEmail("1235543qq.com");
		client.setPhone("23123");
		//PO对象之间相互设置关联关系
		address.setClient(client);
		client.setAddress(address);
		dao.addClient(client);
	}
	
	//获取客户信息
	public Client loadClient(Integer id) {
		return dao.loadClient(id);
	}
}

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="text.TextBean" %>
<%@page import="PO.*" %>
<html>
	<head>
		<title>Hibernate5的一对一关系映射</title>
	</head>
	<body>
		<h2>Hibernate5的一对一关联映射</h2>
		<hr>
		<!-- 调用TextBean测试 -->
		<jsp:useBean id="test" class="text.TextBean"></jsp:useBean>
		<%
			test.addCompany();
			out.println("添加一个公司<br>");
			test.addClient();
			out.println("添加一个客户<br>");
			Integer id=new Integer(1);
			Company company=test.loadCompany(id);
			out.println("加载id为1的客户<br>");
			Login login=company.getLogin();
			out.println("获取公司的登陆账号<br>");
			Client client=test.loadClient(id);
			out.println("获取id为1的客户<br>");
			Address address=client.getAddress();
			out.println("获取该客户地址");
			out.println("<br>company.getCompanyname()="+company.getCompanyname());
			out.println("<br>company.getEmail()="+company.getEmail());
			out.println("<br>company.getLinkman()="+company.getLinkman());
			out.println("<br>company.getTelephone()="+company.getTelephone());
			out.println("<br>login.getLoginname()="+login.getLoginname());
			out.println("<br>login.getLoginpwd()="+login.getLoginpwd());
			out.println("<br>");
			out.println("<br>client.getClientname()="+client.getClientname());
			out.println("<br>client.getPhone()="+client.getPhone());
			out.println("<br>client.getEmail()="+client.getEmail());
			out.println("<br>address.getProvince()="+address.getProvince());
			out.println("<br>address.getCity()="+address.getCity());
			out.println("<br>address.getStreet()="+address.getStreet());
			out.println("<br>address.getZipcode()="+address.getZipcode());
		%>
	</body>
</html>

运行结果：