Hibernate入门BLOG[十、Hibernate对象关系多对多映射]

[java] 
多学生------多教师 
1、  Java类文件：【省略set和get方法】 
Student.java 
public class Student { 
    private int id; 
    private String name; 
    private Set<Teacher> teas; 
} 
Teacher.java 
public class Teacher { 
    private int id; 
    private String name; 
    private Set<Student> stus; 
} 
2、  Xml映射文件： 
 
Student.hbm.xml: 
<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC  
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "www.zzzyk.com"> 
 
<hibernate-mapping  
    package="cn.hibernate.model"> 
    <class name="Student" table="student"> 
        <id name="id"> 
            <generator class="native" /> 
        </id> 
        <property name="name" column="name"/> 
        <!-- 对应的table是teacher_student --> 
        <set name="teas" table="teacher_student"> 
            <!-- 首先找到student_id --> 
            <key column="student_id"></key> 
                <!-- 然后找到teacher_id找到teacher --> 
            <many-to-many class="Teacher" column="teacher_id"></many-to-many> 
        </set> 
    </class> 
</hibernate-mapping> 
 
Teacher.hbm.xml 
<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC  
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "www.zzzyk.com"> 
 
<hibernate-mapping  
    package="cn.hibernate.model"> 
    <class name="Teacher" table="teacher"> 
        <id name="id"> 
            <generator class="native" /> 
        </id> 
        <property name="name" column="name"/> 
        <set name="stus" table="teacher_student"> 
            <!-- 外键，老师表根据teacher_id --> 
            <key column="teacher_id"></key> 
            <!-- 设置匹配的多对多的关系和另一方的主键 --> 
            <many-to-many class="Student" column="student_id"></many-to-many> 
        </set> 
         
    </class> 
</hibernate-mapping> 
 
3、  插入自动生成表操作： 
//添加员工和IDcard的方法 
    static void AddTeacherAndStudent(){ 
         
        Session s = null; 
        Transaction tx = null; 
        try{ 
            Student stu = new Student(); 
            Set<Teacher> ts = new HashSet<Teacher>(); 
            Set<Student> ss = new HashSet<Student>(); 
            s = HibernateUtil.getSession(); 
            tx = s.beginTransaction(); 
            Teacher t1 = new Teacher(); 
            ts.add(t1); 
            Teacher t2 = new Teacher(); 
            ts.add(t2); 
            Student s1 = new Student(); 
            ss.add(s1); 
            Student s2 = new Student(); 
            ss.add(s2); 
            //tea.setStus(sets); 
            //stu.setTeas(sett); 
            t1.setName("t1"); 
            t2.setName("t2"); 
            s1.setName("s1"); 
            s2.setName("s2"); 
            t1.setStus(ss); 
            s.save(t1); 
            s.save(t2); 
            s.save(s1); 
            s.save(s2); 
            tx.commit(); 
        }catch(HibernateException e){ 
            //判断事务有没有完全提交的判断方式 
            if(tx != null){ 
                tx.rollback(); 
                throw e; 
            } 
        }finally{ 
       &nbs

补充：软件开发 , Java ,