对方案一的hibernate实现，利用hibernate中的父子关系来解决

对方案一的hibernate实现，利用hibernate中的父子关系来解决：
java文件

public class Party {
	Long partyId;
	String partyRole;
}
public class Person {
	Long id;
	Party party;
	String login;
	String name;
	String sex;
       ......
}
public class Department {
	Long id;
	Party party;
	String name;
	String address;
	......
}
public abstract class PartyRelationship {
	Long id;
	Party partyFrom;
	Party partyTo;	
	String partyRole;		
}
public class PersonRelationship extends PartyRelationship{}
public class DepartmentRelationship extends PartyRelationship{}
public class PersonDepartment extends PartyRelationship{}

hbm.xml文件

<hibernate-mapping package="com.bulain.model">
	<class name="Party" table="party">
		<id name="partyId" column="party_id" type="java.lang.Long" >
			<generator class="native"/>
		</id>
		<property name="partyRole" column="party_role" type="java.lang.String"/>
	</class>
	<class name="Person" table="person">
		<id name="id" column="id" unsaved-value="0"> 
            <generator class="foreign"> 
                <param name="property">party</param> 
            </generator> 
        </id> 
		<one-to-one name="party" class="Party" cascade="all" constrained="true" />  
		<property name="login" column="login" type="java.lang.String"/>
		<property name="name" column="name" type="java.lang.String"/>			
		<property name="sex" column="sex" type="java.lang.String"/>
	</class>
	<class name="Department" table="department">
		<id name="id" column="id" unsaved-value="0"> 
            <generator class="foreign"> 
                <param name="property">party</param> 
            </generator> 
        </id> 
		<one-to-one name="party" class="Party" cascade="all" constrained="true"/>  
		<property name="name" column="name" type="java.lang.String"/>
		<property name="address" column="address" type="java.lang.String"/>
	</class>
	<class name="PartyRelationship" table="party_relationship" abstract="true">
		<id name="id" column="id" type="java.lang.Long">
			<generator class="native"/>
		</id>
		<discriminator column="party_role" type="java.lang.String"/>
		<many-to-one name="partyFrom" column="party_from_id" not-null="true"/>
		<many-to-one name="partyTo" column="party_to_id" not-null="true"/>
		<subclass name="PersonRelationship" discriminator-value="per_per">
			<property name="partyRole" column="party_role" insert="false"
				update="false"/>
		</subclass>
		<subclass name="PersonDepartment" discriminator-value="per_dept">
			<property name="partyRole" column="party_role" insert="false"
				update="false"/>
		</subclass>
		<subclass name="DepartmentRelationship" discriminator-value="dept_dept">
			<property name="partyRole" column="party_role" insert="false"
				update="false"/>
		</subclass>
	</class>
</hibernate-mapping>

对于这个实现所以关系仍在party_relationship这张表中进行维护，通过PersonRelationship、DepartmentRelationship、PersonDepartment这三个子类进行维护。