mybatis查询缓存——（十三）

1.     mybatis缓存介绍

如下图，是mybatis一级缓存和二级缓存的区别图解：

mybatis提供查询缓存，用于减轻数据压力，提高数据库性能。

mybaits提供一级缓存，和二级缓存。

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1JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JoNb0RK1pT61JEFrrj4+PDUx8fHw8Y96MHFc8b+qMIvdbPoduAwEgnVoDQDq1BoB0ag0A6dQaANKpNQCkU2sASKfWAJBOrQEgnVoDQDq1BoB0ag0A6dQaANKpNQCkU2sASKfWAJBOrQEgnVoDQLp//d28+YtgnAUAAAAASUVORK5CYII=" 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一级缓存是SqlSession级别的缓存。在操作数据库时需要构造 sqlSession对象，在对象中有一个数据结构（HashMap）用于存储缓存数据。不同的sqlSession之间的缓存数据区域（HashMap）是互相不影响的。

二级缓存是mapper级别的缓存，多个SqlSession去操作同一个Mapper的sql语句，多个SqlSession可以共用二级缓存，二级缓存是跨SqlSession的。

为什么要用缓存？

如果缓存中有数据就不用从数据库中获取，大大提高系统性能。

2.     一级缓存

　　2.1     一级缓存工作原理

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" 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　缓存原理:　对sql语句进行计算后得出一个key值，根据此key查询缓存中是否有与此key相同的数据，如果没有查到就从数据库查询(会发出SQL语句查询)并将结果一级写入缓存。如果根据key值查到就直接返回结果。缓存就是一个hashmap。LocalCache是一级缓存的区域(HashMap).

第一次发起查询用户id为1的用户信息，先去找缓存中是否有id为1的用户信息，如果没有，从数据库查询用户信息。得到用户信息，将用户信息存储到一级缓存中。

如果sqlSession去执行commit操作（执行插入、更新、删除），清空SqlSession中的一级缓存，这样做的目的为了让缓存中存储的是最新的信息，避免脏读。

第二次发起查询用户id为1的用户信息，先去找缓存中是否有id为1的用户信息，缓存中有，直接从缓存中获取用户信息。

　　2.2    一级缓存测试(根据日志信息是否发出SQL语句查询即可判断是否进行读数据库)

mybatis默认支持一级缓存，不需要在配置文件去配置。

按照上边一级缓存原理步骤去测试。

@Test

   public void testCache1() throws Exception{

      SqlSession sqlSession = sqlSessionFactory.openSession();//创建代理对象

      UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

      //下边查询使用一个SqlSession

      //第一次发起请求，查询id为1的用户

      User user1 = userMapper.findUserById(1);

      System.out.println(user1);

//    如果sqlSession去执行commit操作（执行插入、更新、删除），清空SqlSession中的一级缓存，这样做的目的为了让缓存中存储的是最新的信息，避免脏读。

      //更新user1的信息

      user1.setUsername("测试用户22");

      userMapper.updateUser(user1);

      //执行commit操作去清空缓存

      sqlSession.commit();

      //第二次发起请求，查询id为1的用户

      User user2 = userMapper.findUserById(1);

      System.out.println(user2);

      sqlSession.close();

   }

　　2.3    一级缓存应用

正式开发，是将mybatis和spring进行整合开发，事务控制在service中。

一个service方法中包括 很多mapper方法调用。

service{

//开始执行时，开启事务，创建SqlSession对象

//第一次调用mapper的方法findUserById(1)

//第二次调用mapper的方法findUserById(1)，从一级缓存中取数据

//方法结束，sqlSession关闭

}

如果是执行两次service调用查询相同 的用户信息，不走一级缓存，因为service方法结束，sqlSession就关闭，一级缓存就清空。

3.     二级缓存

　　3.1 原理

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" 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原理:

　　首先从缓存中查找，没找到就进行数据库查询，查询出的结果写入二级缓存，并计算命中率，第一次没找到命中率为0;第二次通过先从缓存中查找，找到之后命中率为0.5.

首先开启mybatis的二级缓存。

sqlSession1去查询用户id为1的用户信息，查询到用户信息会将查询数据存储到二级缓存中。

如果SqlSession3去执行相同 mapper下sql，执行commit提交，清空该 mapper下的二级缓存区域的数据。

sqlSession2去查询用户id为1的用户信息，去缓存中找是否存在数据，如果存在直接从缓存中取出数据。

二级缓存与一级缓存区别，二级缓存的范围更大，多个sqlSession可以共享一个UserMapper的二级缓存区域。

UserMapper有一个二级缓存区域（按namespace分） ，其它mapper也有自己的二级缓存区域（按namespace分）。

每一个namespace的mapper都有一个二缓存区域，两个mapper的namespace如果相同，这两个mapper执行sql查询到数据将存在相同 的二级缓存区域中。

　　3.2     开启二级缓存

mybaits的二级缓存是mapper范围级别，除了在SqlMapConfig.xml设置二级缓存的总开关，还要在具体的mapper.xml中开启二级缓存。

1. 在核心配置文件SqlMapConfig.xml中加入

<setting name="cacheEnabled" value="true"/>

	描述	允许值	默认值
cacheEnabled	对在此配置文件下的所有cache 进行全局性开/关设置。	true false	true

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" alt="" />

2. UserMapper.xml中开启二缓存

在UserMapper.xml中开启二缓存，UserMapper.xml下的sql执行完成会存储到它的缓存区域（HashMap）。

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AjwzgJBoPBijKDNGkomU9qrCcniihBooposZGflaJJV0RCFrjKrm7wLdYkanUGDAaDwXKYWZo0PBGtu7u9eZlb10BrUqQu/tqE6KP0LIUmcfNJvCY1rgvGQFh3B4PBYEWZeZp0Ivp90u3Ny7Zo3R29f2WzsbnC5OskZyk0KZQlPhk4PPknubrBN/w+CQaDwYoyIzWJ2i/Io82CoZ9XFK1cwN9xgMFgsKIMmqSFcHWDb9AkGAwGK8qgSVoonIcmwWAwWFFmiibh/5mFwWAwmFSTAAAAgCkDTQIAAGAK0CQAAACmAE0CAABgCtAkAAAApgBNAgAAYArQJAAAAKbwfyFXAZuT7XrtAAAAAElFTkSuQmCC" alt="" />

3.     调用pojo类实现序列化接口

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KJyUemAAAHDDIFAEgAMgUASAAyBQBIADIFAEgAMj1YRr7SPvFC4MAYi0wJWzIyEi3a1PoApvLAJg9mQidGIlPCloyMJPFCyjiZSi+RKXRiJDJNDGFL9ku6RZuU9eucAn4xZAqdyEemhC3xFjrJIGxJ2SM2SbPofUW1FOm135JB44U4qyNHjuWRKfQmN5kStsTZac9hS3rGJjGCjgTXwdtBvBBpGVC/mO9ZZAo9yE+mhC1ptu8/bEnP2CTlek28mR2kJIakt56CSpUKB/cFiCQ3mRK2pG27WiJ52JKy7BWbpD6KJGKFZE9EBYUYsyi9tC+ATrYyJWxJFmFL7KZHxyYp18s2LzdrNseRNF5IafdJlZU9g7MByBQ6kZtMCVtiFtx/2BKb6NgkpnaXgZH+buKFlHFL0/v3o5Ap9CBjmRK2JIOwJX1ik5gxmuojv3LH+zuJF1L2lalSGEAiN5myOPRA5Ba2ZBfxQkoe2ocdgkyPg9zClgwfL6Qi+JCpc6PJLGDuiEyhE8j0aMglbAnxQmCc5CNTAIADBpkCACQAmQIAJACZAgAkAJkCACQAmR4Ly5n1IH2oxLX/WP5Qx+pecmuIgwLDMhaZZhu2xF1DtMujnUnXjR5EpsICfTnKNNFiVBt4ChUcRiLTfMOWOE/LdwrctGOZ9qn0YGSaPA6KspqflLq2GQ6Lkcg0McPJtNPPOJFpKgaLg6IUiNwOoyEfmY40bInvzlBf1ZkDaIlo4uwVa+ZXxeyzsTSJIUEj+ohb2fK6mNysjNVLqwLuEif2MijusZoQJu7hnCVRrKzNXitvHT9vJaodxEGpaO11ItOjJTeZji5sSaAjaqyhv1pMHK2aRYWeqV1lbE+3WrppbS4nykhFaInS2m5X6/ZeeRYWeqbNsZoQJn4NVs90dTOxA59sspYzy8h+f3YHcVDKuGVQkOnRkp9MRxa2RJepjSvPsEy9iCNxswGugAIelGRq9AGrJZ9XZm77MN946R5CGeZbWWYznDa0kjQOivTS3M6c6XGSm0xHF7akZZjvDejbZRpYzrSvTB0lSTIVVoCWc0WZegN2u2QVxzQ4A9CsS71aXHWZZh3qiSh6puCQrUzHErZEuwHlLoMX1zPteVtqi55pOplqPdNvi4k6lm9mb7t0SweIg6J3OZHp0ZKbTEcXtiQwwRmOcVf3OCNu/Pdb1tl2kzWPaW7sJlP/1lDgWNZLY/Zz3Q8NTuN6y/VXBWaz62C3dGdxUDbQMwWHjGU6jrAl7jjevtztiCVLL05TOKJJW61CQ6z772730Lk1b0lNlqldrXM336rfubO0Lm+N2Y0wqMXkZukN56tjhd/rruKgbECm4JCbTFkcGkRWiyv3KSszcydxUDZwAwockCkcCMKUQs3wcVAUS5qupGd6tCBTyJ3NTIJgUuKgQBbkI1MAgAMGmQIAJACZAgAkAJkCACQAmQIAJACZHiyd1pkentglS3KEiCaQgLHINNuwJWVZej9Yspfm7LsCNDJNxQ6XlfI38vzpaBiJTPMNWxJYptTPHsMjkocr0+QRTYIvpY3IdDSMRKaJSSlTcfVSIx+Z7o/BIpps/tWXlEamoyEfmY40bEnoN+NmhkOj3eWsmCxWxuqlwUgnTr3VTlK+f8QoiwdDifhZSgASZ+WUUByUwF6hVU4CMVfUrM273k1EE/M/G40GZdr681M4OHKT6ejClpSlIb/QFS31TOudmvgmIXOGNjWOtDrFVg0tUw8GcigRJQCJFptEjoNi7+WvyCcsXtW+rtXgEU2cX+gHf63vl3H2jToSZEx+Mh1Z2BKjiet+oX1dazI1SnrBSkSZGpvMl3ZWoLoY4pZ5VmOTiHFQmrX0jZJrSy6vxd/mK1mtJLr1VCF1SOmZHgm5yXR0YUu8hjqr66sy1RXRTaY9e6ZSKBElAIkem0TsSDYD//CY3Vjt1F3WWsnSSL+slPkfZHpsZCvTsYQt8VvqDNh3KtOOs6VaKJFteqaiTGNnHiRpKlk+A0Q0Mf+j34BCpuMjN5mOLmyJi9cnlIKQJJbpylvFPwYtlIgcgETLUqY43TjSaqsEYwaydhbRROqZKmWkYnCIZCzTcYQt8YKJ+jOV4dgkskwD4UnDE6P2S3+3GLlqoUTkACRKlnq/yImtYt/RarabulSyNiV2E9EkePu+9Ib5yiQAHDS5yZTFoQfCc3O/sHwHyeARTfSHSSPH+3DoINPjIBxxOp8fow7J8BFNfPToT0SIGiXI9Ghwh/nH0CslognsjnxkCgBwwCBTAIAEIFMAgAQgUwCABCBTAIAEIFMAgAQgUwCABCBTAIAEIFMAgAQgUwCABCBTAIAEIFMAgAQgUwCABCBTAIAEIFMAgAT8HzUmYncsXkz0AAAAAElFTkSuQmCC" alt="" />

为了将缓存数据取出执行反序列化操作，因为二级缓存数据存储介质多种多样，不一定在内存。

4.     测试方法(根据日志信息是否发出SQL语句查询即可判断是否进行读数据库)

// 二级缓存测试
    @Test
    public void testCache2() throws Exception {
        SqlSession sqlSession1 = sqlSessionFactory.openSession();
        SqlSession sqlSession2 = sqlSessionFactory.openSession();
        SqlSession sqlSession3 = sqlSessionFactory.openSession();
        // 创建代理对象
        UserMapper userMapper1 = sqlSession1.getMapper(UserMapper.class);
        // 第一次发起请求，查询id为1的用户
        User user1 = userMapper1.findUserById(1);
        System.out.println(user1);

        //这里执行关闭操作，将sqlsession中的数据写到二级缓存区域
        sqlSession1.close();

        //使用sqlSession3执行commit()操作
        UserMapper userMapper3 = sqlSession3.getMapper(UserMapper.class);
        User user  = userMapper3.findUserById(1);
        user.setUsername("张明明");
        userMapper3.updateUser(user);
        //执行提交，清空UserMapper下边的二级缓存
        sqlSession3.commit();
        sqlSession3.close();

        UserMapper userMapper2 = sqlSession2.getMapper(UserMapper.class);
        // 第二次发起请求，查询id为1的用户
        User user2 = userMapper2.findUserById(1);
        System.out.println(user2);

        sqlSession2.close();

    }

5.     useCache配置

在statement中设置useCache=false可以禁用当前select语句的二级缓存，即每次查询都会发出sql去查询，默认情况是true，即该sql使用二级缓存。

<select id="findOrderListResultMap" resultMap="ordersUserMap" useCache="false">

总结：针对每次查询都需要最新的数据sql，要设置成useCache=false，禁用二级缓存。

7.     刷新缓存（就是清空缓存）

在mapper的同一个namespace中，如果有其它insert、update、delete操作数据后需要刷新缓存，如果不执行刷新缓存会出现脏读。

设置statement配置中的flushCache="true" 属性，默认情况下为true即刷新缓存，如果改成false则不会刷新。使用缓存时如果手动修改数据库表中的查询数据会出现脏读。

如下：

<insert id="insertUser" parameterType="cn.itcast.mybatis.po.User" flushCache="true">

总结：一般下执行完commit操作都需要刷新缓存，flushCache=true表示刷新缓存，这样可以避免数据库脏读。

4.     mybatis整合ehcache（重点）

ehcache是一个分布式缓存框架。

4.1     分布缓存

我们系统为了提高系统并发，性能、一般对系统进行分布式部署（集群部署方式）

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" 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不使用分布缓存，缓存的数据在各各服务单独存储，不方便系统 开发。所以要使用分布式缓存对缓存数据进行集中管理。

mybatis无法实现分布式缓存，需要和其它分布式缓存框架进行整合。

4.2     整合方法(掌握)

mybatis提供了一个cache接口，如果要实现自己的缓存逻辑，实现cache接口开发即可。

mybatis和ehcache整合，mybatis和ehcache整合包中提供了一个cache接口的实现类。

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" 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mybatis默认实现cache类是：

aaarticlea/png;base64,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" 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4.3    加入ehcache包

aaarticlea/png;base64,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" alt="" />

4.4     整合ehcache

配置mapper中cache中的type为ehcache对cache接口的实现类型。

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" alt="" />

4.5    加入ehcache的配置文件

ehcache.xml

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">
    <diskStore path="F:\develop\ehcache" />
    <defaultCache
        maxElementsInMemory=""
        maxElementsOnDisk=""
        eternal="false"
        overflowToDisk="false"
        timeToIdleSeconds=""
        timeToLiveSeconds=""
        diskExpiryThreadIntervalSeconds=""
        memoryStoreEvictionPolicy="LRU">
    </defaultCache>
</ehcache>

5.     二级应用场景

对于访问多的查询请求且用户对查询结果实时性要求不高，此时可采用mybatis二级缓存技术降低数据库访问量，提高访问速度，业务场景比如：耗时较高的统计分析sql、电话账单查询sql等。

实现方法如下：通过设置刷新间隔时间，由mybatis每隔一段时间自动清空缓存，根据数据变化频率设置缓存刷新间隔flushInterval，比如设置为30分钟、60分钟、24小时等，根据需求而定。

6     二级缓存局限性

mybatis二级缓存对细粒度的数据级别的缓存实现不好，比如如下需求：对商品信息进行缓存，由于商品信息查询访问量大，但是要求用户每次都能查询最新的商品信息，此时如果使用mybatis的二级缓存就无法实现当一个商品变化时只刷新该商品的缓存信息而不刷新其它商品的信息，因为mybaits的二级缓存区域以mapper为单位划分，当一个商品信息变化会将所有商品信息的缓存数据全部清空。解决此类问题需要在业务层根据需求对数据有针对性缓存。