1.数据表：
orders：订单表 customer：客户表
orders:
id  int(4)    <pk>
orderno  varchar(20)
moeny decimal(10,2)
customer_id int(4) <fk>

customer:
id int(4) <pk>
name varchar(20)
phone varchar(20)

2.pojo类
public class Customer implements Serilizable{
    private Integer id;
    private String name;
    private String phone;
    public Customer(){
    }
}
public class Orders implements Serilizable{
    private Integer id;
    private String orderno;
    private Double moeny;
    private Customer customer;
    public Orders(){
    }
}

3.hbm.xml
Orders.hbm.xml
<hibernate-mapping package="com.lhb.vo">
    <class name="Orders" table="orders">
        <id name="id" column="id" type="integer">
            <generator class="native"/>
        </id>
         <property name="moeny" column="moeny" type="double"/>
        <property name="orderno" column="orderno" type="string"/>
        <many-to-one name="customer_id" class="com.lhb.Customer" lazy="false" not-null="true"/>
    </class>
</hibernate-mapping>
Customer.hbm.xml

<hibernate-mapping package="com.lhb.vo">
   <class name="Customer" table="customer">
        <id name="id" column="id" type="integer">
                <generator class="native"/>
        </id>
        <property name="name" column="name" type="string"/>
        <proerty name="phone" column="phone" type="string"/>
    </class>
</hibernate-mapping>