问在Hibernate中不工作的一对一lazy=“无代理”

EN

Foo:
    Integer id; //primary key
    String orderSeq; //unique key
    //others
Bar:
    String orderSeq; //primary key refer Foo's orderSeq 
    //others

Foo.hbm.xml:
<id name="id" type="java.lang.Integer">
    <column name="id" />
    <generator class="identity" />
</id>
<property name="orderSeq" type="java.lang.String">
    <column name="order_seq" length="40" not-null="true" unique="true">
    </column>
</property>
<one-to-one name="bar" class="com.foo.Bar" lazy="no-proxy">
    <formula>order_seq</formula>
</one-to-one>        

Bar.hbm.xml:
<id name="orderSeq" type="java.lang.String">
    <column name="order_seq" length="40">
    </column>
</id>
<one-to-one name="foo" class="com.foo.Foo" property-ref="orderSeq" lazy="no-proxy">
</one-to-one>

@Test
public void test_query_us_order(){
    Query query = session.createQuery("from Foo a where a.orderSeq = '151207173519268'");
    query.list();
}

select ...
from
    bar bar0_ 
left outer join
    foo foo1_ 
        on bar0_.order_seq=foo1_.order_seq 
left outer join
    bar bar2_ 
        on foo1_.order_seq=bar2_.order_seq 
where
    bar0_.order_seq=?

select ... 
from
    foo foo0_ 
left outer join
    bar bar1_ 
        on foo0_.order_seq=bar1_.order_seq 
left outer join
    foo bar2_ 
        on bar1_.order_seq=bar2_.order_seq 
where
    foo0_.order_seq=?