Hibernate: 关联关系一对多映射

1. 新建Student 类, Class 类, 设置Id, name; get, set方法
2. 在Student 类下增添 private Class c;
3. Student.hbm.xml中 添加

   1. <many-to-one name="c" column="classId" class="com.base.model.Class"></many-to-one>　　//多对一

   2.  1 <?xml version="1.0"?>
       2 <!DOCTYPE hibernate-mapping PUBLIC
       3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
       4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
       5 
       6 <hibernate-mapping package="com.base.model">
       7 
       8     <class name="Student" table="t_student">    <!-- 类名与对应的数据表名 -->
       9         <id name="id" column="stuId">            <!-- 字段名,设置主键 -->
      10             <generator class="native"/>
      11         </id>
      12         <property name="name"/>            <!--普通字段  -->
      13         
      14         <many-to-one name="c" column="classId" class="com.base.model.Class"></many-to-one>　　//多对一
      15     </class>
      16 
      17 </hibernate-mapping>

       

4. 设置Class.hbm.xml
   
   2.  1 <?xml version="1.0"?>
       2 <!DOCTYPE hibernate-mapping PUBLIC
       3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
       4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
       5 
       6 <hibernate-mapping package="com.base.model">
       7 
       8     <class name="Class" table="t_class">    <!-- 类名与对应的数据表名 -->
       9         <id name="id" column="classId">            <!-- 字段名,设置主键 -->
      10             <generator class="native"/>
      11         </id>
      12         <property name="name" column="className"/>            <!--普通字段  -->
      13     </class>
      14 
      15 </hibernate-mapping>

       

5. 添加Hibernate.cfg.xml
   
   1. 在<session-factory>标签里添加

   2. 1     <mapping resource="com/base/model/Student.hbm.xml"/>    <!-- xml版使用resource -->
      2     <mapping resource="com/base/model/Class.hbm.xml"/>    <!-- xml版使用resource -->

6. 设置测试类
   
   1. 　　

   2.  1 public class StudentCalssTest2Test {
       2     SessionFactory sessionFactory = HibernateUtil.getSessionFactory();    //由于每个步骤都会用到所以移到外面来
       3     Session session;
       4     @Before
       5     public void setUp() throws Exception {
       6         session = sessionFactory.openSession();    //生成一个新的session
       7         session.beginTransaction();    //开启事物
       8     }
       9 
      10     @After
      11     public void tearDown() throws Exception {
      12         session.getTransaction().commit();    //提交事务
      13         session.close();                    //关闭session
      14     }
      15 
      16     @Test
      17     public void testTestAdd() {
      18         //简单添加示例
      19         Class c = new Class();
      20         c.setName("2013级");
      21         session.save(c);
      22         
      23         Student s1 = new Student();        //创建一个学生
      24         s1.setName("zhansan");            //设置名称
      25         s1.setC(c);
      26         session.save(s1);                //保存学生
      27         
      28         Student s2 = new Student();        //创建一个学生
      29         s2.setName("李四");            //设置名称
      30         s2.setC(c);
      31         session.save(s2);                //保存学生
      32     }
      　　}

       

Hibernate: 关联关系一对多映射

原文：http://www.cnblogs.com/sidianshui/p/4114658.html