1.在开发中,有的类信息比较复杂,而且某几个信息可以组成某一个部分,这个时候可以采用组件映射,组件映射是一张表映射到多个类。表结构
2.类的设计
Link.java
public class Link {
private String phone;
private String qq;
private String email;
private String address;
public Link() {
}
public Link(String phone, String qq, String email, String address) {
super();
this.phone = phone;
this.qq = qq;
this.email = email;
this.address = address;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getQq() {
return qq;
}
public void setQq(String qq) {
this.qq = qq;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Person.java
public class Person {
private int id;
private String name;
private int age;
private Link link;
public Person() {
}
public Person(String name, int age, Link link) {
super();
this.name = name;
this.age = age;
this.link = link;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Link getLink() {
return link;
}
public void setLink(Link link) {
this.link = link;
}
}
3.映射文件信息
<hibernate-mapping package="cn.sxt.pojo">
<class name="Person" table="t_person_info">
<id name="id">
<generator class="native">
</generator>
</id>
<property name="name"/>
<property name="age"/>
<!-- 组件映射 -->
<component name="link" class="Link">
<property name="phone"/>
<property name="qq"/>
<property name="email"/>
<property name="address"/>
</component>
</class>
</hibernate-mapping>
4.测试
public class HibernateTest {
/**
* 生成数据库表的工具方法
* */
@Test
public void testCreateDB(){
Configuration cfg = new Configuration().configure();
SchemaExport se = new SchemaExport(cfg);
//第一个参数 是否打印sql脚本
//第二个参数 是否将脚本导出到数据库中执行
se.create(true, true);
}
/**
* 初始化表数据
*/
@Test
public void testInit(){
Session session = null;
Transaction tx = null;
try {
session = HibernateUtil.getSession();
tx = session.beginTransaction();
Link l1 = new Link("1324115534","345324","mike@qq.com","多伦多");
Link l2 = new Link("1345432367","675754","lily@qq.com","纽约");
Person p1 = new Person("mike",23,l1);
Person p2 = new Person("lily",40,l2);
session.save(p1);
session.save(p2);
tx.commit();
} catch (Exception e) {
if(tx!=null)
tx.rollback();
}finally {
HibernateUtil.close();
}
}
/**
*/
@Test
public void testGetData(){
Session session = HibernateUtil.getSession();
Person p1 = (Person)session.get(Person.class, 1);
System.out.println(p1);
HibernateUtil.close();
}
}