hibernate集合映射

package loaderman.a_collection;import java.util.HashSet;import java.util.Set;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.classic.Session;import org.junit.Test;public class App { ???private static SessionFactory sf; ???static { ???????sf = new Configuration() ???????????????.configure() ???????????????.addClass(User.class) ??// 测试时候使用 ???????????????.buildSessionFactory(); ???} ???// 保存set ???@Test ???public void testSaveSet() throws Exception { ???????Session session = sf.openSession(); ???????session.beginTransaction(); ???????//-- 保存 ???????Set<String> addressSet = new HashSet<String>(); ???????addressSet.add("广州"); ???????addressSet.add("深圳"); ???????// 用户对象 ???????User user = new User(); ???????user.setUserName("Jack"); ???????user.setAddress(addressSet); ???????// 保存 ???????session.save(user); ???????session.getTransaction().commit(); ???????session.close(); ???} ???// 保存list/map ???@Test ???public void testSaveList() throws Exception { ???????Session session = sf.openSession(); ???????session.beginTransaction(); ???????User user = new User(); ???????user.setUserName("Tom");// ???????// 用户对象 ?-- ?list// ???????user.getAddressList().add("广州");// ???????user.getAddressList().add("深圳");// ???????// 保存// ???????session.save(user); ???????// 用户对象 ?-- ?Map ???????user.getAddressMap().put("A0001", "广州"); ???????user.getAddressMap().put("A0002", "深圳"); ???????// 保存 ???????session.save(user); ???????session.getTransaction().commit(); ???????session.close(); ???} ???// 获取 ???@Test ???public void testGet() throws Exception { ???????Session session = sf.openSession(); ???????session.beginTransaction(); ???????// 获取 ???????User user = (User) session.get(User.class, 3); // 及时加载 ???????System.out.println(user.getUserId()); ???????System.out.println(user.getUserName()); ???????// 当查询用户，同时可以获取用户关联的list集合的数据 (因为有正确映射) ???????// 当使用到集合数据的使用，才向数据库发送执行的sql语句 ?(懒加载) ???????System.out.println(user.getAddressList()); ???????session.getTransaction().commit(); ???????session.close(); ???}}

package loaderman.a_collection;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Set;/// javabean设计public class User { ???private int userId; ???private String userName; ???// 一个用户，对应的多个地址 ???private Set<String> address; ???private List<String> addressList = new ArrayList<String>(); ???//private String[] addressArray; // 映射方式和list一样 ????<array name=""></array> ???private Map<String,String> addressMap = new HashMap<String, String>(); ???public Map<String, String> getAddressMap() { ???????return addressMap; ???} ???public void setAddressMap(Map<String, String> addressMap) { ???????this.addressMap = addressMap; ???} ???public List<String> getAddressList() { ???????return addressList; ???} ???public void setAddressList(List<String> addressList) { ???????this.addressList = addressList; ???} ???public int getUserId() { ???????return userId; ???} ???public void setUserId(int userId) { ???????this.userId = userId; ???} ???public String getUserName() { ???????return userName; ???} ???public void setUserName(String userName) { ???????this.userName = userName; ???} ???public Set<String> getAddress() { ???????return address; ???} ???public void setAddress(Set<String> address) { ???????this.address = address; ???}}

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC ????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" ???"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="loaderman.a_collection"> ???????<class name="User" table="t_user"> ???????<id name="userId" column="id"> ???????????<generator class="native"></generator> ???????</id> ???????????<property name="userName"></property> ???????????????<!-- ????????????set集合属性的映射 ???????????????name 指定要映射的set集合的属性 ???????????????table 集合属性要映射到的表 ???????????????key ?指定集合表(t_address)的外键字段 ???????????????element 指定集合表的其他字段 ???????????????????type 元素类型，一定要指定 ????????--> ????????<set name="address" table="t_address"> ????????????<key column="uid"></key> ????????????<element column="address" type="string"></element> ????????</set> ?????????????????<!-- ?????????????list集合映射 ????????????????list-index ?指定的是排序列的名称 (因为要保证list集合的有序) ?????????--> ?????????<list name="addressList" table="t_addressList"> ???????????????<key column="uid"></key> ???????????????<list-index column="idx"></list-index> ???????????????<element column="address" type="string"></element> ?????????</list> ???????????????????<!-- ??????????????map集合的映射 ?????????????????key ?指定外键字段 ?????????????????map-key 指定map的key ??????????????????element ?指定map的value ??????????--> ?????????<map name="addressMap" table="t_addressMap"> ?????????????<key column="uid"></key> ?????????????<map-key column="shortName" type="string" ></map-key> ?????????????<element column="address" type="string" ></element> ?????????</map> ??????????????????????</class> ???</hibernate-mapping>