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hibernate 单项多对一查询问题

查询语句

public static void loadStudent() {
  Session session = HibernateSessionFactory.openSession(); 
  Student s1 = (Student) session.load(Student.class, 1);
  //已重写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>

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

求解？

进击的小白菜

2016-12-05

源自：Hibernate初探之一对多映射 3-3

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进击的小白菜提问者
2016-12-08

Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: com.hellojava.entity.Student column: cid (should be mapped with insert="false" update="false")

 <!-- insert="false" update="false" 才可以查询出cid -->
   <!-- <property name="cid" column="cid" type="integer" insert="false" update="false"></property> -->
   <property name="cid" column="cid" type="integer"></property>

不明白为什么必须添加