Employee

public class Employee {

  private Long id;

  private String name;

HourlyEmployee

public class HourlyEmployee extends Employee {

  private Double rate;

SalariedEmployee

public class SalariedEmployee extends Employee {

  private Double salary;

Employee.hbm.xml

<class name="Employee" table="t_employee">

        <id name="id">

            <!-- 不能使用native的主键生成方式 -->

            <generator class="org.hibernate.id.enhanced.TableGenerator" />

        </id>

        <property name="name" />

        <!-- 在配置子类 -->

        <union-subclass name="HourlyEmployee" table="t_HourlyEmployee">

            <property name="rate" />

        </union-subclass>

        <union-subclass name="SalariedEmployee" table="t_SalariedEmployee">

            <property name="salary" />

        </union-subclass>

    </class>

MainTest

public class MainTest {

  Session session = null;

  @Before

  public void save() {

    session = HibernateUtils.INSTANCE.getSession();

    session.beginTransaction();

    Employee employee = new Employee("jege");

    HourlyEmployee hourlyEmployee = new HourlyEmployee();

    hourlyEmployee.setName("hourly");

    hourlyEmployee.setRate(200D);

    SalariedEmployee salariedEmployee = new SalariedEmployee();

    salariedEmployee.setName("salaried");

    salariedEmployee.setSalary(300D);

    session.save(employee);

    session.save(hourlyEmployee);

    session.save(salariedEmployee);

  }

  @Test

  public void get() {

    Employee employee = (Employee) session.get(Employee.class, 1L);

    System.out.println(employee.getName());

    HourlyEmployee hourlyEmployee = (HourlyEmployee) session.get(HourlyEmployee.class, 2L);

    System.out.println(hourlyEmployee.getName());

    System.out.println(hourlyEmployee.getRate());

    SalariedEmployee salariedEmployee = (SalariedEmployee) session.get(SalariedEmployee.class, 3L);

    System.out.println(salariedEmployee.getName());

    System.out.println(salariedEmployee.getSalary());

  }

  @After

  public void colse() {

    session.getTransaction().commit();

    session.close();

  }

}

源码地址

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

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