hql 一对一多表查询有关问题

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.copote.nontaxteam.hibernate.pojo.Instance" table="INSTANCE" schema="XXZWZX">        <id name="instanceid" type="java.lang.String">            <column name="INSTANCEID" length="20" />            <generator class="assigned" />        </id>        <property name="prjid" type="java.lang.String">            <column name="PRJID" length="20" not-null="true" />        </property>        <property name="name" type="java.lang.String">            <column name="NAME" length="500" />        </property>        <property name="declaretype" type="java.lang.String">            <column name="DECLARETYPE" length="4" >                <comment>申报人类型（单位/个个）</comment>            </column>        </property>        <property name="acceptno" type="java.lang.String">            <column name="ACCEPTNO" length="50" >                <comment>受理编号</comment>            </column>        </property>        <!-- 共享主键方式的一对一关联关系(与个人) -->        <one-to-one name="instanceperson"             class="com.copote.nontaxteam.hibernate.pojo.Instanceperson"            cascade="all"            lazy="false"/>                <!-- 共享主键方式的一对一关联关系 (与单位)-->        <one-to-one name="instancecorp"             class="com.copote.nontaxteam.hibernate.pojo.Instancecorp"            cascade="all"            lazy="false"/>           </class></hibernate-mapping>

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- 单位 --><hibernate-mapping>    <class name="com.copote.nontaxteam.hibernate.pojo.Instancecorp" table="INSTANCECORP" schema="XXZWZX">        <id name="instanceid" type="java.lang.String">            <column name="INSTANCEID" length="20" />            <generator class="foreign">                <param name="property">instance</param>            </generator>        </id>        <!-- 共享主键方式的一对一关联关系 -->        <one-to-one name="instance"             class="com.copote.nontaxteam.hibernate.pojo.Instance"            constrained="true"/>        <property name="corpname" type="java.lang.String">            <column name="CORPNAME" length="100" not-null="true" />        </property>        <property name="corporatorcertno" type="java.lang.String">            <column name="CORPORATORCERTNO" length="30" >                <comment>证件号码</comment>            </column>        </property>    </class></hibernate-mapping>