Hibernate之映射继承关系（四） （2）

<hibernate-mapping >
    <class name="mypack.Company" table="COMPANIES" >
    <id name="id" type="long" column="ID">
      <generator class="increment"/>
    </id>

    <property name="name" type="string"  column="NAME" />
    <set 
        name="employees"
        inverse="true"
        lazy="true" >
     <key column="COMPANY_ID" />
     <one-to-many class="mypack.Employee" />
     </set>   

     </class>
     </hibernate-mapping>

<hibernate-mapping >

      <class name="mypack.Employee" table="EMPLOYEES">
      <id name="id" type="long" column="ID">
      <generator class="increment"/>
      </id>
      <property name="name" type="string" column="NAME" />

      <many-to-one
        name="company"
        column="COMPANY_ID"
        class="mypack.Company"
      />

      <joined-subclass name="mypack.HourlyEmployee" table="HOURLY_EMPLOYEES" >
      <key column="EMPLOYEE_ID" />
      <property name="rate" column="RATE" type="double" />
      </joined-subclass>

      <joined-subclass name="mypack.SalariedEmployee"  table="SALARIED_EMPLOYEES" >
      <key column="EMPLOYEE_ID" />
      <property name="salary" column="SALARY" type="double" />
      </joined-subclass>
     
      </class>
      </hibernate-mapping>