package cn.happy.entity;public class Student {    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    @Override    public String toString() {        return "Student [name=" + name + ", age=" + age + ", id=" + id + "]";    }    private String name;    private Integer age;    private Integer id;    

    }

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="connection.username">scott</property>
<property name="connection.password">0123</property>

<!-- 输出所有 SQL 语句到控制台。 -->
<property name="hibernate.show_sql">true</property>

<!-- 在 log 和 console 中打印出更漂亮的 SQL。 -->
<property name="hibernate.format_sql">true</property>
<!-- 方言 -->
<property name="hibernate.dialect"> org.hibernate.dialect.Oracle10gDialect</property>

<property name="hbm2ddl.auto">update</property>


<mapping resource="cn/happy/entity/Student.hbm.xml"/>


</session-factory>

</hibernate-configuration>

<!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">  <hibernate-mapping package="cn.happy.entity">     <class name="Student" table="Student">         <id name="id" type="int" column="id">         </id>         <property name="name" type="string" column="name"/>         <property name="age" type="int" column="age"/>     </class>     </hibernate-mapping>

package cn.happy.entity;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil {    private static Configuration cfg=new Configuration().configure();    private static SessionFactory factory=cfg.buildSessionFactory();         //01.方法返回session    public static Session getSession(){        return factory.openSession();    }        //02.关闭session    public static void closeSession(){        getSession().close();    }    }

    //  1.2 修改学生          @Test    public void updateTest(){         Session session = HibernateUtil.getSession();                  //不被上下文跟踪对象          /*Student stu=new Student();         stu.setId(3);         stu.setName("微冷的雨训练营");*/                  //方式二：如何用呗上下文跟踪的方式         //检索出一条记录，一个实体对象         Student stu= (Student)session.load(Student.class,3);         stu.setName("金龙加油！！！！");         Transaction tx = session.beginTransaction();         session.update(stu);         tx.commit();         HibernateUtil.closeSession();         System.out.println("update ok!");    }