hibernate 二级缓存

package com.qjmotor.hibernate;

import org.hibernate.CacheMode;import org.hibernate.Session;

import junit.framework.TestCase;

public class CacheTest extends TestCase {   /**  * 开启二级缓存  *   * 两个session中，缓存数据  */ public void testCache1(){  Session session=null;  try{   session=HibernateUtils.getSession();   session.beginTransaction();   //发出Sql语句   Student student = (Student)session.get(Student.class, 1);   System.out.println("student.getName()=" + student.getName());      session.getTransaction().commit();  }catch(Exception e){   e.printStackTrace();   session.getTransaction().rollback();  }finally{   HibernateUtils.closeSession(session);  }    try{   session=HibernateUtils.getSession();   session.beginTransaction();   //不会发出查询语句，二级缓存是进程级的，不同session共享二级缓存   Student student = (Student)session.get(Student.class, 1);   System.out.println("student.getName()=" + student.getName());      session.getTransaction().commit();  }catch(Exception e){   e.printStackTrace();   session.getTransaction().rollback();  }finally{   HibernateUtils.closeSession(session);  } }  /**  * 开启二级缓存  *   * 两个session中，缓存数据  */ public void testCache2(){  Session session=null;  try{   session=HibernateUtils.getSession();   session.beginTransaction();   //发出Sql语句   Student student = (Student)session.load(Student.class, 1);   System.out.println("student.getName()=" + student.getName());      session.getTransaction().commit();  }catch(Exception e){   e.printStackTrace();   session.getTransaction().rollback();  }finally{   HibernateUtils.closeSession(session);  }    try{   session=HibernateUtils.getSession();   session.beginTransaction();   //不会发出查询语句，二级缓存是进程级的，不同session共享二级缓存   Student student = (Student)session.load(Student.class, 1);   System.out.println("student.getName()=" + student.getName());      session.getTransaction().commit();  }catch(Exception e){   e.printStackTrace();   session.getTransaction().rollback();  }finally{   HibernateUtils.closeSession(session);  } }

}

 

 

 

 

testCache1()结果

14:45:06,593  WARN CacheFactory:43 - read-only cache configured for mutable class: com.qjmotor.hibernate.Student14:45:06,593  WARN EhCacheProvider:86 - Could not find configuration [com.qjmotor.hibernate.Student]; using defaults.Hibernate: select student0_.id as id1_0_, student0_.name as name1_0_, student0_.class_id as class3_1_0_ from t_student student0_ where student0_.id=?student.getName()=李四student.getName()=李四

到此处说明不同session是共享二级缓存的

 

换种测试方式，testCache1()在第二个try出设置断点，目的是待student装入二级缓存后，执行testCache2()

testCache2()结果

Hibernate: select student0_.id as id1_0_, student0_.name as name1_0_, student0_.class_id as class3_1_0_ from t_student student0_ where student0_.id=?student.getName()=李四student.getName()=李四

 

为什么testCache2()不利用二级缓存取数据呢？