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hibernate3学习笔记(十九)｜关系映射：一对一
作者： 发布时间：2008-09-03 18:50:47

 A.唯一外键关联

DDL：

  1. CREATE TABLE user (
  2.     id INT(11) NOT NULL auto_increment PRIMARY KEY,
  3.     name VARCHAR(100) NOT NULL default '',
  4.     room_id INT(11)
  5. );
  7. CREATE TABLE room (
  8.     id INT(11) NOT NULL auto_increment PRIMARY KEY,
  9.     address VARCHAR(100) NOT NULL default ''
  10. );

User.java

  1. package com.hb3.pack_02.model;
  3. public class User {
  5.     private Integer id;
  6.     private String name;
  7.     private Room room;
  8.     
  9.     public User() {
  10.     }
  12.     public Integer getId() {
  13.         return id;
  14.     }
  15.     public void setId(Integer id) {
  16.         this.id = id;
  17.     }
  18.     public String getName() {
  19.         return name;
  20.     }
  21.     public void setName(String name) {
  22.         this.name = name;
  23.     }
  24.     public Room getRoom() {
  25.         return room;
  26.     }
  27.     public void setRoom(Room room) {
  28.         this.room = room;
  29.     }
  30. }

Room.java

  1. package com.hb3.pack_02.model;
  3. public class Room {
  5.     private Integer id; 
  6.     private String address;
  7.     private User user;
  8.     
  9.     public Room() {
  10.     }
  11.     
  12.     public Integer getId() { 
  13.         return id; 
  14.     } 
  15.     public void setId(Integer id) { 
  16.         this.id = id; 
  17.     }
  18.     public String getAddress() { 
  19.         return address; 
  20.     }
  21.     public void setAddress(String address) { 
  22.         this.address = address; 
  23.     }
  24.     public User getUser() {
  25.         return user;
  26.     }
  27.     public void setUser(User user) {
  28.         this.user = user;
  29.     }
  30. }

User.hbm.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <!DOCTYPE hibernate-mapping PUBLIC
  4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
  5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  7. <hibernate-mapping> 
  9.     <class name="com.hb3.pack_02.model.User" table="user"> 
  10.         <id name="id" column="id" type="java.lang.Integer"> 
  11.             <generator class="native"/> 
  12.         </id> 
  14.         <property name="name" column="name" type="java.lang.String"/> 
  15.         
  16.         <many-to-one name="room" 
  17.                      column="room_id" 
  18.                      class="com.hb3.pack_02.model.Room"
  19.                      cascade="all"
  20.                      outer-join="true"
  21.                      unique="true"/>    
  22.     </class> 
  24. </hibernate-mapping>

Room.hbm.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <!DOCTYPE hibernate-mapping PUBLIC
  4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
  5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  7. <hibernate-mapping> 
  9.     <class name="com.hb3.pack_02.model.Room" table="room"> 
  10.         <id name="id" column="id"> 
  11.             <generator class="native"/> 
  12.         </id> 
  14.         <property name="address" 
  15.                   column="address" 
  16.                   type="java.lang.String"/> 
  17.                   
  18.         <one-to-one name="user"
  19.                     class="com.hb3.pack_02.model.User"
  20.                     property-ref="room"/>
  21.     </class> 
  23. </hibernate-mapping>

测试代码：

  1. package com.hb3.pack_02;
  3. import org.hibernate.Session;
  4. import org.hibernate.SessionFactory;
  5. import org.hibernate.Transaction;
  6. import org.hibernate.cfg.Configuration;
  8. import com.hb3.pack_02.model.Room;
  9. import com.hb3.pack_02.model.User;
  11. public class BusinessService {
  13.     public static void main(String[] args) {
  14.         
  15.         Configuration config = new Configuration().configure();
  16.         SessionFactory sessionFactory = config.buildSessionFactory();      
  17.         Session session = sessionFactory.openSession();
  19.         User user1 = new User();
  20.         user1.setName("shenbin"); 
  21.         Room room1 = new Room(); 
  22.         room1.setAddress("NTU-M8-419");
  23.         user1.setRoom(room1);
  24.    
  25.         User user2 = new User(); 
  26.         user2.setName("chanyan"); 
  27.         Room room2 = new Room(); 
  28.         room2.setAddress("NTU-M8-418");
  29.         user2.setRoom(room2);
  30.       
  31.         Transaction tx = session.beginTransaction();
  32.         session.save(user1);
  33.         session.save(user2);        
  34.         tx.commit();
  35.         
  36.         Room room = (Room) session.load(Room.class, new Integer(1));
  37.         System.out.println(room.getUser().getName());
  38.         
  39.         session.close();
  40.         sessionFactory.close();
  41.     }
  42. }

 A.主键关联

DDL：

  1. CREATE TABLE user (
  2.     id INT(11) NOT NULL auto_increment PRIMARY KEY,
  3.     name VARCHAR(100) NOT NULL default ''
  4. );
  6. CREATE TABLE room (
  7.     id INT(11) NOT NULL auto_increment PRIMARY KEY,
  8.     address VARCHAR(100) NOT NULL default ''
  9. );

Room和User类同上。

Room.hbm.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <!DOCTYPE hibernate-mapping PUBLIC
  4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
  5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  7. <hibernate-mapping> 
  9.     <class name="com.hb3.pack_18.model.Room" table="room">
  10.     
  11.         <id name="id" column="id"> 
  12.             <generator class="foreign"> 
  13.                 <param name="property">user</param>
  14.             </generator>
  15.         </id> 
  17.         <property name="address" 
  18.                   column="address" 
  19.                   type="java.lang.String"/> 
  20.                   
  21.         <one-to-one name="user"
  22.                     class="com.hb3.pack_18.model.User"
  23.                     constrained="true"/>
  24.     </class> 
  26. </hibernate-mapping>

User.hbm.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <!DOCTYPE hibernate-mapping PUBLIC
  4.     "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
  5.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  7. <hibernate-mapping> 
  9.     <class name="com.hb3.pack_18.model.User" table="user">
  10.      
  11.         <id name="id" column="id" type="java.lang.Integer"> 
  12.             <generator class="native"/> 
  13.         </id> 
  15.         <property name="name" column="name" type="java.lang.String"/> 
  16.         
  17.         <one-to-one name="room" 
  18.                     class="com.hb3.pack_18.model.Room"
  19.                     cascade="all"/>
  20.     </class> 
  22. </hibernate-mapping>

测试代码：

  1. package com.hb3.pack_18;
  3. import java.io.IOException;
  4. import java.sql.SQLException;
  6. import org.hibernate.Session;
  7. import org.hibernate.SessionFactory;
  8. import org.hibernate.Transaction;
  9. import org.hibernate.cfg.Configuration;
  11. import com.hb3.pack_18.model.Room;
  12. import com.hb3.pack_18.model.User;
  14. public class BusinessService {
  16.     public static void main(String[] args) throws IOException, SQLException {
  17.         
  18.         Configuration config = new Configuration().configure();
  19.         SessionFactory sessionFactory = config.buildSessionFactory();      
  20.         Session session = sessionFactory.openSession();
  22.         
  23.         User user1 = new User();
  24.         user1.setName("chanyan"); 
  25.         Room room1 = new Room(); 
  26.         room1.setAddress("NTU-M8-419");
  27.         user1.setRoom(room1);
  28.         room1.setUser(user1);
  29.                 
  30.         User user2 = new User(); 
  31.         user2.setName("shenbin"); 
  32.         Room room2 = new Room(); 
  33.         room2.setAddress("NTU-M8-418");
  34.         user2.setRoom(room2);
  35.         room2.setUser(user2);
  36.                 
  37.         Transaction tx = session.beginTransaction();
  38.         session.save(user1);
  39.         session.save(user2);
  40.         tx.commit();
  43.         session.close();
  44.         sessionFactory.close();
  45.     }
  46. }

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