spring管理hibernate，mybatis，一级缓存失效原因

mybatis缓存：一级缓存和二级缓存

hibernate缓存：一级缓存和二级缓存

关于缓存：

缓存是介于物理数据源与应用程序之间，是对数据库中的数据复制一份临时放在内存中的容器，

其作用是为了减少应用程序对物理数据源访问的次数，从而提高了应用程序的运行性能。

Hibernate在进行读取数据的时候，根据缓存机制在相应的缓存中查询，如果在缓存中找到了需要的数据(我们把这称做“缓存命 中")，

则就直接把命中的数据作为结果加以利用，避免了大量发送SQL语句到数据库查询的性能损耗。

一般我们在项目整合中 存在数据访问的性能问题，研究了下缓存在各个阶段的应用，以在5个方面进行缓存的设计：

1.最底层可以配置的是MySQL自带的query cache，

2.mybatis的一级缓存，默认情况下都处于开启状态，只能使用自带的PerpetualCache，无法配置第三方缓存

3.mybatis的二级缓存，可以配置开关状态，默认使用自带的PerpetualCache，但功能比较弱，能够配置第三方缓存，

4.service层的缓存配置，结合spring，可以灵活进行选择

5.hibernate的一级缓存，默认也是开启状态，session级别的，可以自由使用。但这里注意下hibernate获取session的 方式。

6.hibernate的二级缓存需要引用 第三方的 插件，并在hibernate配置文件中进行相应的配置。

7.针对实际业务情况，直接缓存部分html页面，直接返回给客户端。

发现在整合的项目测试中被spring整合的mybatis和hibernate的一级缓存都失效了。

首先1.mybatis和hibernate的一级缓存生效的范围是sqlsession，是为了在sqlsession没有关闭时，业务需要重复查询相同数据使用的。一旦sqlsession关闭，则由这个sqlsession缓存的数据将会被清空。

spring管理的mybatis

 @Test
    public void TestBi(){

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BillService service=(BillService)context.getBean("billServiceImpl");

        List<Bill> alls = service.findAlls();
        System.out.println("-----------------------------------------------");
        List<Bill> a = service.findAlls();
        System.out.println(alls.size());
    }

applicationContext.xml是我spring的配置文件，管理session
测试结果：

ogging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@144e54da] was not registered for synchronization because synchronization is not active
JDBC Connection [285401532, URL=jdbc:mysql:///supermarket_ssh, UserName=root@localhost, MySQL Connector Java] will not be managed by Spring
==>  Preparing: select * from bill
==> Parameters:
<==    Columns: bid, bmoney, bname, createtime, paystate, supId, hscode, scount, sunit
<==        Row: 24, 150262, 猕猴桃山西, 2017-09-06, 1, 3, ssh-code, 1000, bdss
<==        Row: 26, 1500, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 50, bdss
<==        Row: 27, 150262, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 1000, bdss
<==        Row: 29, 2561, xx, 2017-08-25, 0, 1, ssh-code, 0, bdss
<==        Row: 30, 3642, aa, 2017-08-25, 0, 1, ssh-code, 1000, 56ds3fs
<==        Row: 31, 0, bb, 2017-08-25, 0, 3, ssh-code, 52, bdss
<==        Row: 33, 3335, aa, 2017-08-25, 0, 3, ssh-code, 1000, 56ds3fs
<==        Row: 41, 2000, 小炒肉, 2017-09-03, 1, 3, ssh-code, 100, bdqn
<==        Row: 42, 0, zahngyu, 2017-09-03, 1, 12, ssh-code, 100, bdqn
<==        Row: 44, 200, 共百搭, 2017-09-06, 1, 3, dsfas, 15, dfa
<==        Row: 45, 5000, 张雨张雨, 2017-09-06, 0, 14, ssh-supmarket, 50, bdqn
<==        Row: 49, 0, dfaf, 2017-09-09, 0, 1, s-code, 3, dfa
<==        Row: 50, 0, 宫保鸡丁, 2017-09-10, 0, 1, gbjd-code, 2, bdqn
<==        Row: 52, 0, f'da, 2017-09-10, 1, 1, f'da, 5, f'da
<==        Row: 55, 0, hznagu, 2017-09-10, 1, 1, ssh-code, 25, bdqn
<==        Row: 56, 0, 宫保鸡丁, 2017-09-10, 0, 1, ssj-code, 2, bdqn
<==        Row: 57, 0, dfa, 2017-09-10, 1, 1, dfa, 2, fda
<==        Row: 58, 0, fda, 2017-09-10, 0, 1, dfa, 25, dfa
<==        Row: 59, 0, dfa, 2017-09-10, 0, 1, fda, 2, dfa
<==      Total: 19
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@144e54da]
19
-----------------------------------------------
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@d68b796] was not registered for synchronization because synchronization is not active
JDBC Connection [1441587130, URL=jdbc:mysql:///supermarket_ssh, UserName=root@localhost, MySQL Connector Java] will not be managed by Spring
==>  Preparing: select * from bill
==> Parameters:
<==    Columns: bid, bmoney, bname, createtime, paystate, supId, hscode, scount, sunit
<==        Row: 24, 150262, 猕猴桃山西, 2017-09-06, 1, 3, ssh-code, 1000, bdss
<==        Row: 26, 1500, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 50, bdss
<==        Row: 27, 150262, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 1000, bdss
<==        Row: 29, 2561, xx, 2017-08-25, 0, 1, ssh-code, 0, bdss
<==        Row: 30, 3642, aa, 2017-08-25, 0, 1, ssh-code, 1000, 56ds3fs
<==        Row: 31, 0, bb, 2017-08-25, 0, 3, ssh-code, 52, bdss
<==        Row: 33, 3335, aa, 2017-08-25, 0, 3, ssh-code, 1000, 56ds3fs
<==        Row: 41, 2000, 小炒肉, 2017-09-03, 1, 3, ssh-code, 100, bdqn
<==        Row: 42, 0, zahngyu, 2017-09-03, 1, 12, ssh-code, 100, bdqn
<==        Row: 44, 200, 共百搭, 2017-09-06, 1, 3, dsfas, 15, dfa
<==        Row: 45, 5000, 张雨张雨, 2017-09-06, 0, 14, ssh-supmarket, 50, bdqn
<==        Row: 49, 0, dfaf, 2017-09-09, 0, 1, s-code, 3, dfa
<==        Row: 50, 0, 宫保鸡丁, 2017-09-10, 0, 1, gbjd-code, 2, bdqn
<==        Row: 52, 0, f'da, 2017-09-10, 1, 1, f'da, 5, f'da
<==        Row: 55, 0, hznagu, 2017-09-10, 1, 1, ssh-code, 25, bdqn
<==        Row: 56, 0, 宫保鸡丁, 2017-09-10, 0, 1, ssj-code, 2, bdqn
<==        Row: 57, 0, dfa, 2017-09-10, 1, 1, dfa, 2, fda
<==        Row: 58, 0, fda, 2017-09-10, 0, 1, dfa, 25, dfa
<==        Row: 59, 0, dfa, 2017-09-10, 0, 1, fda, 2, dfa
<==      Total: 19
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@d68b796]
[entity.Bill@6afd9125, entity.Bill@2d444b03, entity.Bill@5e98c92c, entity.Bill@bf9839, entity.Bill@22a2c691, entity.Bill@6c9a6b5a, entity.Bill@dfe196a, entity.Bill@25368553, entity.Bill@1e6b1f3b, entity.Bill@acf6a17, entity.Bill@373e118c, entity.Bill@4bf21aa9, entity.Bill@3b47433, entity.Bill@3c38c22b, entity.Bill@3253b3f0, entity.Bill@154a6b60, entity.Bill@48cf768b, entity.Bill@2c6fc505, entity.Bill@5defe20d]

测试结果有点多啊但明显是没有使用到mybatis的一级缓存。

如果我们使用mybatis自己管理的session来看下测试结果

@Test
public void TestBi(){

        SqlSession session = MyBatisUtil.getSessionTwo();

BillDao mapper = session.getMapper(BillDao.class);
List<Bill> b1 = mapper.findAlls();
System.out.println(b1.size());
List<Bill> b2 = mapper.findAlls();
System.out.println(b2.size());

Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@6d20ec1b]
==>  Preparing: select * from bill
==> Parameters:
<==    Columns: bid, bmoney, bname, createtime, paystate, supId, hscode, scount, sunit
<==        Row: 24, 150262, 猕猴桃山西, 2017-09-06, 1, 3, ssh-code, 1000, bdss
<==        Row: 26, 1500, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 50, bdss
<==        Row: 27, 150262, 苹果梨山西, 2017-08-25, 0, 1, ssh-code, 1000, bdss
<==        Row: 29, 2561, xx, 2017-08-25, 0, 1, ssh-code, 0, bdss
<==        Row: 30, 3642, aa, 2017-08-25, 0, 1, ssh-code, 1000, 56ds3fs
<==        Row: 31, 0, bb, 2017-08-25, 0, 3, ssh-code, 52, bdss
<==        Row: 33, 3335, aa, 2017-08-25, 0, 3, ssh-code, 1000, 56ds3fs
<==        Row: 41, 2000, 小炒肉, 2017-09-03, 1, 3, ssh-code, 100, bdqn
<==        Row: 42, 0, zahngyu, 2017-09-03, 1, 12, ssh-code, 100, bdqn
<==        Row: 44, 200, 共百搭, 2017-09-06, 1, 3, dsfas, 15, dfa
<==        Row: 45, 5000, 张雨张雨, 2017-09-06, 0, 14, ssh-supmarket, 50, bdqn
<==        Row: 49, 0, dfaf, 2017-09-09, 0, 1, s-code, 3, dfa
<==        Row: 50, 0, 宫保鸡丁, 2017-09-10, 0, 1, gbjd-code, 2, bdqn
<==        Row: 52, 0, f'da, 2017-09-10, 1, 1, f'da, 5, f'da
<==        Row: 55, 0, hznagu, 2017-09-10, 1, 1, ssh-code, 25, bdqn
<==        Row: 56, 0, 宫保鸡丁, 2017-09-10, 0, 1, ssj-code, 2, bdqn
<==        Row: 57, 0, dfa, 2017-09-10, 1, 1, dfa, 2, fda
<==        Row: 58, 0, fda, 2017-09-10, 0, 1, dfa, 25, dfa
<==        Row: 59, 0, dfa, 2017-09-10, 0, 1, fda, 2, dfa
<==      Total: 19
19
19

很明显，只访问了一次数据库，说明单独使用mybatis的 一级缓存是 有效的。

再看看hibernate和 spring整和的情况下，测试hibernate的一级缓存：

@org.junit.Test
    public void TestOneCache(){

       //被spring管理的hibernate 一级缓存失效
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-hiberanate.xml");
        BillService service= (BillService)context.getBean("billServiceImpl");
        List<Bill> allBills = service.findAllBills();
        System.out.println(allBills.size());
        System.out.println("---------------------------------");
        List<Bill> allBillss = service.findAllBills();
        System.out.println(allBillss.size());

    }

测试结果：

Hibernate: select bill0_.bid as bid1_1_, bill0_.bmoney as bmoney2_1_, bill0_.bname as bname3_1_, bill0_.createtime as createti4_1_, bill0_.hscode as hscode5_1_, bill0_.paystate as paystate6_1_, bill0_.scount as scount7_1_, bill0_.sunit as sunit8_1_, bill0_.supId as supId9_1_ from bill bill0_
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
19
---------------------------------
Hibernate: select bill0_.bid as bid1_1_, bill0_.bmoney as bmoney2_1_, bill0_.bname as bname3_1_, bill0_.createtime as createti4_1_, bill0_.hscode as hscode5_1_, bill0_.paystate as paystate6_1_, bill0_.scount as scount7_1_, bill0_.sunit as sunit8_1_, bill0_.supId as supId9_1_ from bill bill0_
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
19

和mybatis一样，被spring管理的hibernate 的一级缓存无效。说明问题 出在spring身上。

先看下spring整合mybatis，sessionFactory是由mybatis提供的，进入sqlSessionFactory类内部。

/**
 *    Copyright 2009-2015 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.session;

import java.sql.Connection;

/**
 * Creates an {@link SqlSesion} out of a connection or a DataSource
 *
 * @author Clinton Begin
 */
public interface SqlSessionFactory {

  SqlSession openSession();

  SqlSession openSession(boolean autoCommit);
  SqlSession openSession(Connection connection);
  SqlSession openSession(TransactionIsolationLevel level);

  SqlSession openSession(ExecutorType execType);
  SqlSession openSession(ExecutorType execType, boolean autoCommit);
  SqlSession openSession(ExecutorType execType, TransactionIsolationLevel level);
  SqlSession openSession(ExecutorType execType, Connection connection);

  Configuration getConfiguration();

}

然后找到它的一个实现类，sqlsessionManager，它同时还实现了SqlSession

**
 * @author Larry Meadors
 */
public class SqlSessionManager implements SqlSessionFactory, SqlSession {

  private final SqlSessionFactory sqlSessionFactory;
  private final SqlSession sqlSessionProxy;

  private ThreadLocal<SqlSession> localSqlSession = new ThreadLocal<SqlSession>();

  private SqlSessionManager(SqlSessionFactory sqlSessionFactory) {
    this.sqlSessionFactory = sqlSessionFactory;
    this.sqlSessionProxy = (SqlSession) Proxy.newProxyInstance(
        SqlSessionFactory.class.getClassLoader(),
        new Class[]{SqlSession.class},
        new SqlSessionInterceptor());
  }

private ThreadLocal<SqlSession> localSqlSession = new ThreadLocal<SqlSession>();这个是让session和当前的线程绑定

关于一级缓存失效的原因还要看他的另一个方法，实现自SqlSession

@Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
      final SqlSession sqlSession = SqlSessionManager.this.localSqlSession.get();
      if (sqlSession != null) {
        try {
          return method.invoke(sqlSession, args);
        } catch (Throwable t) {
          throw ExceptionUtil.unwrapThrowable(t);
        }
      } else {
        final SqlSession autoSqlSession = openSession();
        try {
          final Object result = method.invoke(autoSqlSession, args);
          autoSqlSession.commit();
          return result;
        } catch (Throwable t) {
          autoSqlSession.rollback();
          throw ExceptionUtil.unwrapThrowable(t);
        } finally {
          autoSqlSession.close();
        }
      }
    }

//这是close方法
@Override
  public void close() {
    final SqlSession sqlSession = localSqlSession.get();
    if (sqlSession == null) {
      throw new SqlSessionException("Error:  Cannot close.  No managed session is started.");
    }
    try {
      sqlSession.close();
    } finally {
      localSqlSession.set(null);  //释放线程
    }
  }

看下红色部分的代码，当一个非空的session传过来，重新 opensession() 在代码执行到最后执行autoSqlSession.close()方法，关闭session，释放线程，跳出递归；

大致总结一下：

session和当前线程绑定的过程以及mybatis失效的原因

1,获得请求

2,spring检查到了这种需求，于是去申请一个mybatis的sqlsession（资源池），并将申请到的sqlsession与当前线程绑定，放入threadlocal里面

3,template从threadlocal获取到sqlsession，去执行查询

4,查询结束，清空threadlocal中与当前线程绑定的sqlsession，释放资源

5,我们又需要访问数据，拿到新的session

6,返回到步骤2

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 @org.junit.Test
    public void TestOneCache(){

        //没有被spring管理使用一级缓存
       Session session = HibernateUtil.currentSession();
        System.out.println(session);
        List<Bill> list=session.createQuery( "from Bill ").list();
        System.out.println(list.size());
        List<Bill> lists = session.createQuery( "from Bill ").list();
        System.out.println(lists.size());

       //被spring管理的hibernate 一级缓存失效
        /*ApplicationContext context = new ClassPathXmlApplicationContext("spring-hiberanate.xml");
        BillService service= (BillService)context.getBean("billServiceImpl");
        List<Bill> allBills = service.findAllBills();
        System.out.println(allBills.size());
        System.out.println("---------------------------------");
        List<Bill> allBillss = service.findAllBills();
        System.out.println(allBillss.size());*/

    }

很明显走的缓存

Hibernate:
    select
        bill0_.bid as bid1_1_,
        bill0_.bmoney as bmoney2_1_,
        bill0_.bname as bname3_1_,
        bill0_.createtime as createti4_1_,
        bill0_.hscode as hscode5_1_,
        bill0_.paystate as paystate6_1_,
        bill0_.scount as scount7_1_,
        bill0_.sunit as sunit8_1_,
        bill0_.supId as supId9_1_
    from
        bill bill0_
Hibernate:
    select
        supplier0_.supId as supId1_2_0_,
        supplier0_.createtime as createti2_2_0_,
        supplier0_.supName as supName3_2_0_,
        supplier0_.supUserName as supUserN4_2_0_,
        supplier0_.supUserTel as supUserT5_2_0_,
        supplier0_.supcode as supcode6_2_0_,
        supplier0_.supfax as supfax7_2_0_
    from
        supplier supplier0_
    where
        supplier0_.supId=?
Hibernate:
    select
        supplier0_.supId as supId1_2_0_,
        supplier0_.createtime as createti2_2_0_,
        supplier0_.supName as supName3_2_0_,
        supplier0_.supUserName as supUserN4_2_0_,
        supplier0_.supUserTel as supUserT5_2_0_,
        supplier0_.supcode as supcode6_2_0_,
        supplier0_.supfax as supfax7_2_0_
    from
        supplier supplier0_
    where
        supplier0_.supId=?
Hibernate:
    select
        supplier0_.supId as supId1_2_0_,
        supplier0_.createtime as createti2_2_0_,
        supplier0_.supName as supName3_2_0_,
        supplier0_.supUserName as supUserN4_2_0_,
        supplier0_.supUserTel as supUserT5_2_0_,
        supplier0_.supcode as supcode6_2_0_,
        supplier0_.supfax as supfax7_2_0_
    from
        supplier supplier0_
    where
        supplier0_.supId=?
Hibernate:
    select
        supplier0_.supId as supId1_2_0_,
        supplier0_.createtime as createti2_2_0_,
        supplier0_.supName as supName3_2_0_,
        supplier0_.supUserName as supUserN4_2_0_,
        supplier0_.supUserTel as supUserT5_2_0_,
        supplier0_.supcode as supcode6_2_0_,
        supplier0_.supfax as supfax7_2_0_
    from
        supplier supplier0_
    where
        supplier0_.supId=?
19
Hibernate:
    select
        bill0_.bid as bid1_1_,
        bill0_.bmoney as bmoney2_1_,
        bill0_.bname as bname3_1_,
        bill0_.createtime as createti4_1_,
        bill0_.hscode as hscode5_1_,
        bill0_.paystate as paystate6_1_,
        bill0_.scount as scount7_1_,
        bill0_.sunit as sunit8_1_,
        bill0_.supId as supId9_1_
    from
        bill bill0_
19

--被spring管理的hibernate缓存

 @org.junit.Test
    public void TestOneCache(){

       //被spring管理的hibernate 一级缓存失效
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-hiberanate.xml");
        BillService service= (BillService)context.getBean("billServiceImpl");
        List<Bill> allBills = service.findAllBills();
        System.out.println(allBills.size());
        System.out.println("---------------------------------");
        List<Bill> allBillss = service.findAllBills();
        System.out.println(allBillss.size());

    }

Hibernate: select bill0_.bid as bid1_1_, bill0_.bmoney as bmoney2_1_, bill0_.bname as bname3_1_, bill0_.createtime as createti4_1_, bill0_.hscode as hscode5_1_, bill0_.paystate as paystate6_1_, bill0_.scount as scount7_1_, bill0_.sunit as sunit8_1_, bill0_.supId as supId9_1_ from bill bill0_
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
19
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Hibernate: select bill0_.bid as bid1_1_, bill0_.bmoney as bmoney2_1_, bill0_.bname as bname3_1_, bill0_.createtime as createti4_1_, bill0_.hscode as hscode5_1_, bill0_.paystate as paystate6_1_, bill0_.scount as scount7_1_, bill0_.sunit as sunit8_1_, bill0_.supId as supId9_1_ from bill bill0_
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
Hibernate: select supplier0_.supId as supId1_2_0_, supplier0_.createtime as createti2_2_0_, supplier0_.supName as supName3_2_0_, supplier0_.supUserName as supUserN4_2_0_, supplier0_.supUserTel as supUserT5_2_0_, supplier0_.supcode as supcode6_2_0_, supplier0_.supfax as supfax7_2_0_ from supplier supplier0_ where supplier0_.supId=?
19

一级缓存失效

然后看下spring集成的hibernate配置文件，spring+hibernate的sessionFactory是交给spring来管理的，进入配置文件 找到LocalSessionFactory

 <bean id="sessionFactory"
          class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                <value>zy.entity</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

   private static final ThreadLocal<Session> thread=new ThreadLocal<Session>();

hibernate有两个方法获取session，一个是openSession(),一个是getCurrentSession()

a:getCurrentSession创建的session会绑定到当前线程，而openSession不会。

b:getCurrentSession创建的线程会在事务回滚或事务提交后自动关闭，而openSession必须手动关闭

 public Session openSession() throws HibernateException {
        return this.withOptions().openSession();
    }

    public Session openTemporarySession() throws HibernateException {
        return this.withOptions().autoClose(false).flushBeforeCompletion(false).connectionReleaseMode(ConnectionReleaseMode.AFTER_STATEMENT).openSession();
    }

 public SessionBuilder autoClose(boolean autoClose) {
            this.autoClose = autoClose;
            return this;
        }

 public SessionBuilder flushBeforeCompletion(boolean flushBeforeCompletion) {
            this.flushBeforeCompletion = flushBeforeCompletion;
            return this;
        }

--翻了下他的源码，感觉获得session的过程像个迷宫似的，翻着翻着回来了，貌似回调，不懂，不过我觉得，他是根据请求每次获得session时都“冲洗了”一下，但是我用工具类得到的session也是这样啊

不知道spring到底对hibernate干了什么，让一级缓存失效。你tm到底干了什么？？？？？？/

----希望知道的分享一下 ，非常感谢。