SQL(数据库使用的MySQL)：CREATE TABLE room ( ROOM_ID int NOT NULL auto_increment, ADDRESS varchar(32) NOT NULL default ´´, PRIMARY KEY (ROOM_ID)) TYPE=INNODB;CREATE TABLE user ( USER_ID int NOT NULL auto_increment, NAME varchar(16) NOT NULL default ´´, ROOM_ID int NOT NULL default ´´, INDEX (ROOM_ID), FOREIGN KEY (ROOM_ID) REFERENCES Room(ROOM_ID), PRIMARY KEY (USER_ID)) TYPE=INNODB;
User.javapackage ivan.hibernate.one2many;public class User { private long id; private String name; private Room room; ...}
User.hbm.xml<hibernate-mapping> <class name="ivan.hibernate.one2many.User" table="USER"> <id name="id" column="USER_ID" unsaved-value="0"> <generator class="increment"/> </id> <property name="name"> <column name="NAME" length="16" not-null="true"/> </property> <many-to-one name="room" column="ROOM_ID" class="ivan.hibernate.one2many.Room"/> </class></hibernate-mapping>
Room.javapackage ivan.hibernate.one2many;public class Room { private long id; private String address; private Set users = new HashSet(); ...}
Room.hbm.xml<hibernate-mapping> <class name="ivan.hibernate.one2many.Room" table="ROOM"> <id name="id" column="ROOM_ID" unsaved-value="0"> <generator class="increment"/> </id> <property name="address" type="string"/> <set name="users" table="USER" inverse="true" cascade="all"> <key column="ROOM_ID"/> <one-to-many class="ivan.hibernate.one2many.User"/> </set> </class></hibernate-mapping>//注意这里需要设定 inverse=true。
Test.javapublic class Test { public static void main(String[] args) throws HibernateException { SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory(); Room room = new Room(); room.setAddress("China-10-911"); User user1 = new User(); user1.setName("ivan"); User user2 = new User(); user2.setName("mada");
user1.setRoom(room); user2.setRoom(room); room.getUsers().add(user1); room.getUsers().add(user2); Session session = sessionFactory.openSession(); Transaction tx= session.beginTransaction(); session.save(room); tx.commit(); session.close();
sessionFactory.close(); }}
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