1：多对一
一般关系由多的一方来维护
多的一方需要有一方的字段，一的一方要有多的一方的set集合
一方的配置文件： ClientEntity为一的一方，OrderEntity为多的一方
<?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> ???<class name="com.yuwenhui.entity.ClientEntity" table="t_client" schema="hibernate"> ???????<id name="id" column="id"/> ???????<property name="name" column="name"/> ???????<property name="pawword" column="pawword"/> ???????<property name="blance" column="blance"/> ???????<!-- ???????????name 一行保存多方集合的字段 ???????????table 数据库中多方的表名称 ???????????inverse 是否反转控制权，一般多对一的关联关系由多方来维护 ???????--> ???????<set name="orders" table="t_order" inverse="true"> ???????????<key> ???????????????<!-- ???????????????????name 对应数据中多方表中关联一方的外键 ???????????????--> ???????????????<column name="client_id"/> ???????????</key> ???????????<!-- ???????????????class 多方的实体类路径 ???????????--> ???????????<one-to-many class="com.yuwenhui.entity.OrderEntity"/> ???????</set> ???</class></hibernate-mapping>
多方的配置文件：
<?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> ???<class name="com.yuwenhui.entity.OrderEntity" table="t_order" schema="hibernate"> ???????<id name="id" column="id"/> ???????<property name="name" column="name"/> ???????<property name="price" column="price"/> ???????<!-- ???????????name="client" 对应多方的实体类中关联一方的字段 ???????????class 对应一方的类的路径 ???????????column 在数据生成的列的名称 ????????--> ???????<many-to-one name="client" class="com.yuwenhui.entity.ClientEntity" column="client_id" /> ???</class></hibernate-mapping>
多对多关系
以学生和课程为列：学生可以有多个课程，课程也可以有多个学生
学生中需要有一个集合用于保存该学生选修的课程，课程中也需要有一个集合用于保存选修了该课程的学生集合，多对多关系中只需要有一行维护关联关系即可，即在一方添加
inverse="true"属性
学生配置文件
<?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> ???<class name="domain.Student" table="t_student2" schema="hibernate"> ???????<id name="id"> ???????????<column name="id" sql-type="int(11)"/> ???????????<generator class="native" /> ???????</id> ???????<property name="name"> ???????????<column name="name" sql-type="varchar(20)" length="20" not-null="true"/> ???????</property> ???????<!-- ???????????name 学生表中课程的set集合字段名 ???????????table 需要自动创建的中间表名 ???????????inverse="false" ?表示由该类维护关联关系 ???????--> ???????<set name="courses" table="student_course" inverse="false" > ???????????<key> ???????????????<!-- nam 表示中间表中的字段 --> ???????????????<column name="student_id"/> ???????????</key> ???????????<!-- ???????????????class 另一方的类 ???????????????column 另一方在中间表中的字段 ???????????--> ???????????<many-to-many class="domain.Course" column="course_id"></many-to-many> ???????</set> ???</class></hibernate-mapping>
课程表配置文件
<?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> ???<class name="domain.Course" table="t_course" schema="hibernate"> ???????<id name="id"> ???????????<column name="id" sql-type="int(11)"/> ???????????<generator class="native" /> ???????</id> ???????<property name="name"> ???????????<column name="name" sql-type="varchar(20)" length="20" not-null="true"/> ???????</property> ???????<!-- ???????????name 学生表中课程的set集合字段名 ???????????table 需要自动创建的中间表名 ???????????inverse="false" ?表示该类不维护关联关系 ???????--> ???????<set name="students" table="student_course" inverse="true" > ???????????<key> ???????????????<column name="course_id"/> ???????????</key> ???????????<!-- ???????????????class 另一方的类 ???????????????column 另一方在中间表中的字段 ???????????--> ???????????<many-to-many class="domain.Student" column="student_id"></many-to-many> ???????</set> ???</class></hibernate-mapping>
多对多测试：
package test;import domain.Course;import domain.Student;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.junit.After;import org.junit.Before;import org.junit.Test;/** * Created by Administrator on 2017/9/8 0008. */public class Work98Test { ???SessionFactory sessionFactory; ???Session session; ???@Before ???public ?void ?before(){ ???????Configuration configuration = new Configuration(); ???????configuration.configure(); ???????sessionFactory = configuration.buildSessionFactory(); ???????session = sessionFactory.openSession(); ???} ???@Test ???public void testSave(){ ???????Transaction transaction = session.beginTransaction(); ???????Student student = new Student(); ???????Course course = new Course(); ???????course.setName("软件工程"); ???????student.setName("余文辉");
// ?????学生选修课程 ???????student.getCourses().add(course); ???????session.save(course); ???????session.save(student); ???????transaction.commit(); ???} ???@After ???public ?void ?after(){ ???????session.close(); ???????sessionFactory.close(); ???}}3：一对一
以学生和学生信息表为列，一个学生对应一张学生信息表，一个学生信息表也只能对应一个学生
需要在对应的表和设置对方的字段，并添加相应的get和set方法
一对一对应分为两种，一种是两张表之间主键对应，另一种是在一张表中设置外键关联，这里演示的是前一种
学生类配置文件
<?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> ???<class name="domain.Student" table="t_student2" schema="hibernate"> ???????<id name="id"> ???????????<column name="id" sql-type="int(11)"/> ???????????<generator class="native" /> ???????</id> ???????<property name="name"> ???????????<column name="name" sql-type="varchar(20)" length="20" not-null="true"/> ???????</property> ???????<!-- ???????????name 学生表中课程的set集合字段名 ???????????table 需要自动创建的中间表名 ???????????inverse="false" ?表示由该类维护关联关系 ???????--> ???????<set name="courses" table="student_course" inverse="false" > ???????????<key> ???????????????<!-- nam 表示中间表中的字段 --> ???????????????<column name="student_id"/> ???????????</key> ???????????<!-- ???????????????class 另一方的类 ???????????????column 另一方在中间表中的字段 ???????????--> ???????????<many-to-many class="domain.Course" column="course_id"></many-to-many> ???????</set> ???????????<!-- ???????????????????设置一对一关联关系 ???????????--> ???????<many-to-one name="informationOfStudent" class="domain.InformationOfStudent" column="information_id" unique="true"></many-to-one> ???</class></hibernate-mapping>
学生信息类配置文件
<?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> ???<class name="domain.InformationOfStudent" table="t_information_student" schema="hibernate"> ???????<id name="id"> ???????????<column name="id" sql-type="int(11)"/> ???????????<generator class="native"/> ???????</id> ???????<property name="sex"> ???????????<column name="sex" sql-type="varchar(20)" length="20" not-null="true"/> ???????</property> ???????<property name="age"> ???????????<column name="age" sql-type="int(11)" not-null="true"/> ???????</property> ???????<property name="address"> ???????????<column name="address" ?sql-type="varchar(20)" length="20"/> ???????</property> ???????<property name="tel"> ???????????<column name="tel" sql-type="int(11)" not-null="true"/> ???????</property> ???????<!-- 设置一对一关联关系 --> ???????<one-to-one name="student" class="domain.Student"></one-to-one> ????</class></hibernate-mapping>
测试类源码
package test;import domain.InformationOfStudent;import domain.Student;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.junit.After;import org.junit.Before;import org.junit.Test;/** * Created by Administrator on 2017/9/8 0008. */public class One2OneTest { ???SessionFactory sessionFactory; ???Session session; ???@Before ???public ?void ?before(){ ???????Configuration configuration = new Configuration(); ???????configuration.configure(); ???????sessionFactory = configuration.buildSessionFactory(); ???????session = sessionFactory.openSession(); ???} ???@Test ???public void ?testAddInformation(){ ???????Transaction transaction = session.beginTransaction(); ???????InformationOfStudent ?information = new InformationOfStudent(); ???????information.setAge(20); ???????information.setSex("男"); ???????information.setAddress("江西省"); ???????information.setTel(10086); ???????session.save(information); ???????transaction.commit(); ???} ???@Test ???public void ?testAddRelation(){ ???????Transaction transaction = session.beginTransaction(); ???????InformationOfStudent informationOfStudent = (InformationOfStudent) session.get(InformationOfStudent.class,2); ???????Student student = (Student) session.get(Student.class,1); ???????student.setInformationOfStudent(informationOfStudent); ???????session.save(informationOfStudent); ???????session.save(student); ???????transaction.commit(); ???} ???@After ???public ?void ?after(){ ???????session.close(); ???????sessionFactory.close(); ???}}hibernate 关联关系（多对一、多对多、一对一）的配置
原文地址：http://www.cnblogs.com/yuwenhui/p/7496270.html