在下列案例中：
客户是一；联系人是多；客户可以拥有多个联系人；一个联系人只有一个客户
1、编写实体类
package com.pojo;import java.util.HashSet;import java.util.Set;public class User { ???private Integer uId; ???//客户ID（主表） ???客户是一 ???private String uName; ???//名字 ???private String uTel; ???//手机// ???在客户的表中显示多个联系人// ???使用set集合存储联系人 ???private Set<Link> link = new HashSet<Link>(); ???public Set<Link> getLink() { ???????return link; ???} ???public void setLink(Set<Link> link) { ???????this.link = link; ???} ???public Integer getuId() { ???????return uId; ???} ???public void setuId(Integer uId) { ???????this.uId = uId; ???} ???public String getuName() { ???????return uName; ???} ???public void setuName(String uName) { ???????this.uName = uName; ???} ???public String getuTel() { ???????return uTel; ???} ???public void setuTel(String uTel) { ???????this.uTel = uTel; ???}}package com.pojo;public class Link { ???private Integer cId; ???//联系人ID ???联系人是多 ???private String cName; ???//姓名 ???private String cTel; ???//电话 ???//在联系人的实体类中显示所属客户列表；一个联系人只有一个客户 ???private User user; ???public User getUser() { ???????return user; ???} ???public void setUser(User user) { ???????this.user = user; ???} ???public Integer getcId() { ???????return cId; ???} ???public void setcId(Integer cId) { ???????this.cId = cId; ???} ???public String getcName() { ???????return cName; ???} ???public void setcName(String cName) { ???????this.cName = cName; ???} ???public String getcTel() { ???????return cTel; ???} ???public void setcTel(String cTel) { ???????this.cTel = cTel; ???}}2、配置实体类映射文件
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC ????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" ???"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> ???<hibernate-mapping> ???<!-- 客户配置文件 --> ???????<class name="com.pojo.User" table="p_user"> ???????????<id name="uId" column="uId"> ???????????????<generator class="native"></generator> ???????????</id> ???????????<property name="uName" column="uName"></property> ???????????<property name="uTel" column="uTel"></property> ???????????<!-- set标签的name属性：指的是写在客户表中的联系人的set集合的名称 ????????????????inverse="true"：让主表一方放弃维护 ???????????--> ???????????<set name="link" cascade="save-update,delete" inverse="false"> ???????????<!-- id 的 column 属性的值：数据表的外键名称 --> ???????????????<key column="clid"></key> ???????????????<!-- 客户的所有联系人； class写联系人的实体类路径 --> ???????????????<one-to-many class="com.pojo.Link"/> ???????????</set> ???????</class> ???</hibernate-mapping>
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC ????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" ???"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> ???<hibernate-mapping> ???<!-- 联系人配置文件 --> ???????<class name="com.pojo.Link" table="p_link"> ???????????<id name="cId" column="cId"> ???????????????<generator class="native"></generator> ???????????</id> ???????????<property name="cName" column="cName"></property> ???????????<property name="cTel" column="cTel"></property> ???????????<!-- 联系人所属客户 ???????????????name：客户在联系人实体类的属性 ???????????????class：联系人实体类的路径 ???????????????column：外键名称 ????????????--> ????????????<many-to-one name="user" class="com.pojo.Link" column="clid"></many-to-one> ???????</class> ???</hibernate-mapping>
3、配置核心文件
<?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> ???????<!-- 1、配置数据库信息 ?必写的 --> ???????<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> ???????<property name="hibernate.connection.url">jdbc:mysql:///person</property> ???????<property name="hibernate.connection.username">root</property> ???????<property name="hibernate.connection.password">root</property> ???????<!-- 2、配置hibernate信息 ??可写 ??--> ???????<!-- 输出SQL底层语句 ?--> ???????<property name="hibernate.show_sql">true</property> ???????????????<!-- 输出SQL底层语句 ?进行格式化 --> ???????<property name="hibernate.format_sql">true</property> ???????<!-- 如果没有表。即创建，否则修改表 ?--> ???????<property name="hibernate.hbm2ddl.auto">update</property> ???????<!-- 设置数据库方言 ?--> ???????<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> ???????<!-- 3、把映射文件放到核心配置文件中 必须的 ?--> ???????<mapping resource="com/pojo/Link.hbm.xml"/> ???????<mapping resource="com/pojo/User.hbm.xml"/> ???</session-factory></hibernate-configuration>
4、加载核心配置文件测试是否搭建成功
package com.unitl;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtils { ???private static Configuration cfg = null; ???private static SessionFactory factory = null; ???static{ ???????// 加载 hibernate 核心文件 ???????cfg = new Configuration(); ???????????cfg.configure(); ???????// 创建 SessionFactory对象 ???????factory = cfg.buildSessionFactory(); ???} ???//获取 hibernate核心文件 ???public static SessionFactory getSessionFactory() { ???????return factory; ???????} ???//绑定本地线程session ???public static Session getSessionObject(){ ???????return factory.getCurrentSession(); ???} ???/** ????* 调用方法 ????* ????SessionFactory factory = HibernateUtils.getSessionFactory(); ????* ?????*/ ???public static void main(String[] args) { ???????//执行之后无报错，则配置成功 ???}}5、使用方法实现增删改查操作
package com.junit;import static org.junit.Assert.*;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.junit.Test;import com.pojo.Link;import com.pojo.User;import com.unitl.HibernateUtils;public class Text1 { ???@Test ???public void test() { ???????SessionFactory factory = null; ???????Session session = null; ???????Transaction ts = null; ???????try { ???????????factory = HibernateUtils.getSessionFactory(); ???????????session = factory.openSession(); ???????????ts = session.beginTransaction(); ???????????/** ????????????* 创建联系人 ????????????*/ ???????????Link link1 = new Link(); ???????????link1.setcName("百度"); ???????????????link1.setcTel("400-200-666"); ???????????/** ????????????* 创建客户 ????????????*/ ???????????User user1 = new User(); ???????????user1.setuName("张三"); ???????????user1.setuTel("150*******"); ???????????/** ????????????* 把联系人对象放到客户的set集合里边 ????????????*/ ???????????user1.getLink().add(link1); ???????????/** ????????????* 把客户放在联系人对象里 ????????????*/ ???????????link1.setUser(user1); ???????????//添加到数据库 ???????????session.save(user1); ???????????session.save(link1); ???????????//提交事务 ???????????ts.commit(); ???????} catch (Exception e) { ???????????ts.rollback(); ???????} finally { ???????????session.close(); ???????????factory.close(); ???????} ???} ???/** ????* 简化 ????* 添加操作 ????*/ ???@Test ???public void test2() { ???????SessionFactory factory = null; ???????Session session = null; ???????Transaction ts = null; ???????try { ???????????factory = HibernateUtils.getSessionFactory(); ???????????session = factory.openSession(); ???????????ts = session.beginTransaction(); ???????????//添加一个客户 ???????????User user1 = new User(); ???????????user1.setuName("李四"); ???????????user1.setuTel("150*******"); ???????????//创建联系人 ???????????Link link1 = new Link(); ???????????link1.setcName("腾讯"); ???????????????link1.setcTel("400-200-666"); ???????????//把联系人放到客户的 set 集合里边 ???????????user1.getLink().add(link1); ???????????// 保存到 数据库里 ???????????session.save(user1); ???????????ts.commit(); ???????} catch (Exception e) { ???????????// TODO Auto-generated catch block ???????????e.printStackTrace(); ???????????ts.rollback(); ???????}finally{ ???????????session.close(); ???????????factory.close(); ???????} ???} ???/** ????* 添加一个联系人到已知的客户里 ????* 例子：向一个已知店铺里添加一个商品 ????*/ ???@Test ???public void test3() { ???????SessionFactory factory = null; ???????Session session = null; ???????Transaction ts = null; ???????try { ???????????factory = HibernateUtils.getSessionFactory(); ???????????session = factory.openSession(); ???????????ts = session.beginTransaction(); ???????????//创建一个联系人并添加到已知客户 ???????????Link link1 = new Link(); ???????????link1.setcName("阿里巴巴"); ???????????????link1.setcTel("400-200-666"); ???????????//获取客户 ???????????User user = session.get(User.class,2); ???????????user.getLink().add(link1); ???????????session.save(user); ???????????ts.commit(); ???????} catch (Exception e) { ???????????// TODO Auto-generated catch block ???????????e.printStackTrace(); ???????????ts.rollback(); ???????}finally{ ???????????session.close(); ???????????factory.close(); ???????} ???} ???/** ????* 删除一个客户 ????*/ ???@Test ???public void test4() { ???????SessionFactory factory = null; ???????Session session = null; ???????Transaction ts = null; ???????try { ???????????factory = HibernateUtils.getSessionFactory(); ???????????session = factory.openSession(); ???????????ts = session.beginTransaction(); ???????????//查询客户ID ???????????User user = session.get(User.class, 3); ???????????session.delete(user); ???????????ts.commit(); ???????} catch (Exception e) { ???????????// TODO Auto-generated catch block ???????????e.printStackTrace(); ???????????ts.rollback(); ???????}finally{ ???????????session.close(); ???????????factory.close(); ???????} ???} ???/** ????* 修改操作 ????* 把联系人表中的ID为2的联系人改为客户一的联系人 ????*/ ???@Test ???public void test5() { ???????SessionFactory factory = null; ???????Session session = null; ???????Transaction ts = null; ???????try { ???????????factory = HibernateUtils.getSessionFactory(); ???????????session = factory.openSession(); ???????????ts = session.beginTransaction(); ???????????//查询联系人ID和用户ID ???????????User user = session.get(User.class, 1); ???????????Link link = session.get(Link.class, 2);// ???????把联系人放到客户里边；客户放到联系人里 ???????????user.getLink().add(link); ???????????link.setUser(user); ???????????ts.commit(); ???????} catch (Exception e) { ???????????// TODO Auto-generated catch block ???????????e.printStackTrace(); ???????????ts.rollback(); ???????}finally{ ???????????session.close(); ???????????factory.close(); ???????} ???}}Hibernate框架之路（二）一对多关系
原文地址：http://www.cnblogs.com/yaowan/p/7454293.html