查詢語句

public?static?void?loadStudent()?{
??Session?session?=?HibernateSessionFactory.openSession();?
??Student?s1?=?(Student)?session.load(Student.class,?1);
??//已重寫tostring
??System.out.println(s1);
??//System.out.println(s1.getClassTable());
?}

xml配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
??? "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
??? "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
???
<hibernate-mapping auto-import="true" package="com.hellojava.entity">
?<class name="Student" table="student">
?? <id name="stuId" column="stuId" type="integer">
?? ?<generator class="increment"></generator>
?? </id>
?? <property name="stuName" column="stuName" type="string" length="20"></property>
?? <property name="stuSex" column="stuSex" type="character" length="6"></property>
?? <property name="stuAge" column="stuAge" type="integer"></property>

<!-- 必須加上此才能查詢出外鍵列insert="true" update="true"?-->

<!--
?? <property name="cid" column="cid" type="integer" insert="true" update="true"></property>?? -->

?? <many-to-one name="classTable" class="ClassTable" column="cid"></many-to-one>
?</class>
</hibernate-mapping>

求解？