package com.alice.hibernate03.vo;

import java.util.HashSet;

import java.util.Set;

public class Student {

    private Integer id;

    private String sname;

    private Set<Course> courses = new HashSet<Course>();

    public Integer getId() {

        return id;

    }

    public void setId(Integer id) {

        this.id = id;

    }

    public String getSname() {

        return sname;

    }

    public void setSname(String sname) {

        this.sname = sname;

    }

    public Set<Course> getCourses() {

        return courses;

    }

    public void setCourses(Set<Course> courses) {

        this.courses = courses;

    }

}

package com.alice.hibernate03.vo;

import java.util.HashSet;

import java.util.Set;

public class Course {

    private Integer id;

    private String cname;

    private Set<Student> students = new HashSet<Student>();

    public Integer getId() {

        return id;

    }

    public void setId(Integer id) {

        this.id = id;

    }

    public String getCname() {

        return cname;

    }

    public void setCname(String cname) {

        this.cname = cname;

    }

    public Set<Student> getStudents() {

        return students;

    }

    public void setStudents(Set<Student> students) {

        this.students = students;

    }

}

<?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 package="com.alice.hibernate03.vo">

     <class name="Student" table="t_student">

        <id name="id" column="id">

           <generator class="native"></generator>

        </id>

        <property name="sname" column="sname" type="string"></property>

        <!-- 多对多关系 -->

        <!--

            set 表达集合

                name: 集合的属性名

                table:多对多中间表的表名

            key 表达外键

                column:引用我的外键名

            many-to-many 表达多对多

                class : 集合引用方的类型

                column:对方在中间表的外键名

         -->

        <set name="courses" table="t_student_course" inverse="false" cascade="save-update">

        <!--

                 key 用来描述外键

                 column : 外键的值

               -->

          <key column="sid"></key>

          <many-to-many class="Course" column="cid"></many-to-many>

        </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 package="com.alice.hibernate03.vo">

     <class name="Course" table="t_course">

        <id name="id" column="id">

           <generator class="native"></generator>

        </id>

        <property name="cname" column="cname" type="string"></property>

        <!-- 多对多关系 -->

		<!--

			set 表达集合

				name: 集合的属性名

				table:多对多中间表的表名

			key 表达外键

				column:引用我的外键名

			many-to-many 表达多对多

				class : 集合引用方的类型

				column:对方在中间表的外键名

		 -->

        <set name="students" table="t_student_course" inverse="true" cascade="save-update">

          <key column="cid"></key>

          <many-to-many class="Student" column="sid"></many-to-many>

        </set>

     </class>

</hibernate-mapping>

package com.alice.hibernate03.many;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.junit.Test;

import com.alice.hibernate03.util.HibernateUtil;

import com.alice.hibernate03.vo.Course;

import com.alice.hibernate03.vo.Student;

public class ManyTest {

    @Test

    public void test01(){

        //保存学生 => 通过学生保存课程. 由学生维护外键

        //Student 的

            //inverse =  false

            //cascade =  save-update

        //Course

            //inverse = true

        Session session = HibernateUtil.openSession();

        Transaction tran = session.beginTransaction();

        //...........................

        Student s1 = new Student();

        s1.setSname("angle");

        Student s2 = new Student();

        s2.setSname("echo");

        Course c1 = new Course();

        c1.setCname("jdbc");

        Course c2 = new Course();

        c2.setCname("spring");

        Course c3 = new Course();

        c3.setCname("strust2");

        s1.getCourses().add(c1);

        s1.getCourses().add(c2);

        s2.getCourses().add(c2);

        s2.getCourses().add(c3);

        session.save(s1);

        session.save(s2);

        //...........................

        tran.commit();

        session.close();

    }

}