hibernate映射之单向多对一-程序员宅基地

数据模型：

person表

room表

 

实体对象模型：

Person private static final long serialVersionUID = 1L;
    private int pid;
    private String pname;
    private Room room;

 

 Room private static final long serialVersionUID = 1L;
    private int rid;
    private String rname;

 

xml配置信息

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.skyedu.bean">
    <class name="Person" table="person">
       <id name="pid" column="pid" >
           <generator class="native"></generator>
       </id>
       <property name="pname" column="pname" length="32"></property>
       <many-to-one name="room" column="rid" class="Room" cascade="save-update">
       </many-to-one>
    </class>
</hibernate-mapping>

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.skyedu.bean">
    <class name="Room" table="room">
       <id name="rid" column="rid" >
             <generator class="native"></generator>
       </id>
       <property name="rname" column="rname" length="30"></property>
    </class>
</hibernate-mapping> 

 

测试代码：

    @Test
    public void testSave(){
        Session session = HibernateUtil.getSession();
        Transaction transaction = session.beginTransaction();
        try{
            Room room = new Room();
            room.setRname("水帘洞");
            
            Person person1 = new Person();
            person1.setPname("猴子1");
            person1.setRoom(room);
            
            session.save(person1);
            
            transaction.commit();    
        }catch(Exception e){
            transaction.rollback();
        }finally{
            HibernateUtil.closeSession(session);
        }
    }
    
    @Test
    public void testFind(){
        Session session = HibernateUtil.getSession();
        Person person = (Person) session.get(Person.class, 1);
        System.out.println("psersonName:"+person.getPname());
        System.out.println("roomName:"+person.getRoom().getRname());
        
        
    }