hibernate缓存机制的有关问题

package gpf;public class Dog {    private int id;    private String name;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

<?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="gpf.Dog" table="Dog">          <id name="id" type="java.lang.Integer">              <column name="id"/>              <generator class="native"></generator>          </id>          <property name="name" type="java.lang.String">              <column name="name"/>          </property>    </class></hibernate-mapping>

<?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">com.mysql.jdbc.Driver</property>        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>        <property name="connection.username">root</property>        <property name="connection.password">123</property>        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>                <property name="connection.pool_size">1</property>                <property name="current_session_context_class">thread</property>        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>        <property name="format_sql">true</property>        <property name="show_sql">true</property>        <mapping resource="gpf/Dog.hbm.xml"/>    </session-factory></hibernate-configuration>

public class Test {    private Session session = new AnnotationConfiguration().configure().buildSessionFactory().getCurrentSession();        @org.junit.Test    public void test(){          session.beginTransaction();        Query query = session.createQuery("from Dog");        Iterator<Dog> iterator = query.iterate();        session.getTransaction().commit();    }