Hibernate系列教程10组成关系

组成关系
在一个员工模型里面需要存入
员工公司所在地址的城市&＃xff0c;街道
员工籍贯所在的城市&＃xff0c;街道&＃xff0c;
此时可以抽取城市&＃xff0c;街道变成一个模型即是组成关系

Employee

public class Employee {
private Long id;
private String name;
// 公司的地址
private Address comAddress;
// 籍贯所在地
private Address homeAddress;

Employee.hbm.xml

<class name&＃61;"Employee" table&＃61;"t_employee">
<id name&＃61;"id">
<generator class&＃61;"native" />
id>
<property name&＃61;"name" />



<component name&＃61;"comAddress" class&＃61;"Address">

<property name&＃61;"city" column&＃61;"com_city" />
<property name&＃61;"street" column&＃61;"com_street" />
component>

<component name&＃61;"homeAddress" class&＃61;"Address">
<property name&＃61;"city" column&＃61;"home_city" />
<property name&＃61;"street" column&＃61;"home_street" />
component>
class>

MainTest

public class MainTest {
Session session &＃61; null;
&＃64;Before
public void save() {
session &＃61; HibernateUtils.INSTANCE.getSession();
session.beginTransaction();
Address comAddress &＃61; new Address("bj", "st1");
Address homeAddress &＃61; new Address("sh", "st2");
Employee employee &＃61; new Employee("user");
employee.setComAddress(comAddress);
employee.setHomeAddress(homeAddress);
session.save(employee);
}
&＃64;Test
public void get() throws Exception {
Employee employee &＃61; (Employee) session.get(Employee.class, 1L);
System.out.println(employee);
System.out.println(employee.getComAddress());
System.out.println(employee.getHomeAddress());
}
&＃64;After
public void colse() {
session.getTransaction().commit();
session.close();
}
}

源码地址

https://github.com/je-ge/hibernate

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