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  • Hibernate 系列教程13-继承-鉴别器与内连接相结合

    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" discriminator-value="1">
            <id name="id">
                <generator class="native" />
            </id>
            <discriminator column="types" type="int"/>
            <property name="name" />
            <!-- 在配置子类 -->
            <subclass name="HourlyEmployee" discriminator-value="2">
                <join table="t_HourlyEmployee">
                    <key column="id" />
                    <property name="rate" />
                </join>
            </subclass>
            <subclass name="SalariedEmployee" discriminator-value="3">
                <join table="t_SalariedEmployee">
                    <key column="id" />
                    <property name="salary" />
                </join>
            </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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  • 原文地址:https://www.cnblogs.com/je-ge/p/6105422.html
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