一個持久化類是另一個持久化類的組成部分
顧客表：clients 
id int(4)  <pk>
name varchar(20)
likeman varchar(20)
phone varchar(20)
province varchar(40)
city varchar(40)
street varchar(40)
zipcode char(8)

持久化類：
Clients:
public class Clients implements Serializable{
    private Integer id;
    private String name;
    private String likeman;
    private String phone;
    private Address address;
    public Clients(){
    }
}
public class Address implements Serializable{
    private String province;
    private String city;
    private String street;
    private String zipcode;
    private Clients client;
    public Address(){
    }
}
 hbm.xml
<hibernate-mapping package="com.lhb.vo">
    <class name="Clients" table="clients">
       <id name="id" column="id" type="integer">
            <generator class="native"/>
        </id>
        <property name="name" column="name" type="string"/>
        <property name="likeman" column="likeman" type="string"/>
        <property name="phone" column="phone" type="string/>
        <component name="address" class="com.lhb.vo.Address">
            <parent name="clients"/>
            <property name="province" column="province" type="string"/>
            <property name="city" column="city" type="string"/>
            <property name="street" column="street" type="string"/>
            <property name="zipcode" column="zipcode" type="string"/>
        </component>
    </class>
</hibernate-mapping>