Hibernate映射集合属性1

Set HashSet 无序,不重复 List 有序,可重复 Map HashMap 无序,不重复(以key为准) 数组 e_user e_user_addressSet id userId name address 要说明的信息: a:集合表的名称(集合表) b:集合表中的外键(集合外键) c:集合表中的元素列(集合元素)

<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <!-- 导入包 --> <hibernate-mapping package="cn.itcast.e_hbm_collection"> <!-- 类名 --> <class name="User" table="e_user"> <id name="id" type="integer" column="id_"> <generator class="native" /> </id> <property name="name" type="string" column="name_" /> <!-- addressSet属性,Set集合 --> <set name="addressSet" table="e_user_addressSet"> <key column="userId"></key> <element type="string" column="address_"></element> </set> </class> </hibernate-mapping> package cn.itcast.e_hbm_collection; import java.util.HashSet; import java.util.Set; public class User { private Integer id; private String name; private Set<String> addressSet = new HashSet<String>();// Set集合 public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set<String> getAddressSet() { return addressSet; } public void setAddressSet(Set<String> addressSet) { this.addressSet = addressSet; } } package cn.itcast.e_hbm_collection; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; import org.junit.Test; public class App { private static SessionFactory sessionFactory = new Configuration()// .configure()// .addClass(User.class)// .buildSessionFactory(); @Test public void testSave() throws Exception { Session session = sessionFactory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); // ------------------------------------ // 操作 // Set<String> set = new HashSet<String>(); // set.add("骆家庄东苑"); // set.add("文一新西路"); // 构建对象 User user = new User(); user.setName("李四"); user.getAddressSet().add("新青年厂场"); user.getAddressSet().add("新塘路"); // 保存 session.save(user); // ------------------------------------ tx.commit(); } catch (RuntimeException e) { tx.rollback(); throw e; } finally { session.close(); } } @Test public void testGet() throws Exception { Session session = sessionFactory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); // ------------------------------------ // 获取数据 User user = (User) session.get(User.class, 2); // 显示信息 System.out.println(user.getId()); System.out.println(user.getName()); for (String s : user.getAddressSet()) { System.out.println(s); } // ------------------------------------ tx.commit(); } catch (RuntimeException e) { tx.rollback(); throw e; } finally { session.close(); } } }