1、学生表student和年级表grade

2、类Student和Grade类

  • Student:
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public class Student {
    private int id;
    private String name;
    private int age;
    private Grade grade;
    //get…set
}
  • Grande
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public class Grade {
    private int id;
    private String name;
    //get…set
}

3、映射文件

  • Grade.hbm.xml
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<hibernate-mapping package="cn.siggy.pojo">
    <class name="Grade">
        <id name="id">
            <generator class="native"></generator>
        </id>
        <property name="name"/>
    </class>
</hibernate-mapping>
  • Student.hbm.xml
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<hibernate-mapping package="cn.siggy.pojo">
    <class name="Student">
        <id name="id">
            <generator class="native"></generator>
        </id>
        <property name="name"/>
        <property name="age"/>
        <!-- 多对一  name表示属性名
                    class 指明属性对应的类
                    column指 数据库表中的列名
         -->
        <many-to-one name="grade" class="Grade" column="grade_id" foreign-key="fk_grade" not-null="true"/>    
    </class>
</hibernate-mapping>

4、测试代码

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@Test
public void testSave() throws HibernateException, SerialException, SQLException{
    Session session = null;
    Transaction tx = null;
    try{
        session = HibernateUtil.getSession();
        tx = session.beginTransaction();
        Grade grade = new Grade();
        grade.setName("基础");
        session.save(grade);
        Student stu = new Student();
        stu.setName("张三疯");
        stu.setAge(22);
        stu.setGrade(grade);
        session.save(stu);

        tx.commit();

    }catch (HibernateException e) {
        if(tx!=null)
            tx.rollback();
        e.printStackTrace();
        throw e;
    }finally{
        HibernateUtil.closeSession();
    }
}