Mybatis系列十：整合Ehcache

- 日理万妓 2022-02-16 03:29 311阅读 0赞

MyBatis定义了Cache接口方便我们进行自定义扩展。  
 EhCache 是一个纯Java的进程内缓存框架，具有快速、精干等特点，是Hibernate中默认的CacheProvider。  
1、引入依赖

<dependency>
              <groupId>org.mybatis.caches</groupId>
              <artifactId>mybatis-ehcache</artifactId>
              <version>1.1.0</version>
          </dependency>
          
          <dependency>
              <groupId>org.slf4j</groupId>
              <artifactId>slf4j-api</artifactId>
              <version>1.7.25</version>
          </dependency>
          <dependency>
              <groupId>org.slf4j</groupId>
              <artifactId>slf4j-log4j12</artifactId>
              <version>1.7.25</version>
          </dependency>

2、在mybatis指定自定义的cache

3、创建ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>
    <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">
     
     
     <diskStore path="D:\ehcache" />
     
     
     <defaultCache 
       maxElementsInMemory="10000" 
       maxElementsOnDisk="10000000"
       eternal="false" 
       overflowToDisk="true" 
       timeToIdleSeconds="120"
       timeToLiveSeconds="120" 
       diskExpiryThreadIntervalSeconds="120"
       memoryStoreEvictionPolicy="LRU">
     </defaultCache>
    </ehcache>

测试缓存：

@Test
        public void testSecondLevelCache() throws IOException{
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    
            SqlSession openSession = sqlSessionFactory.openSession();
            SqlSession openSession2 = sqlSessionFactory.openSession();
            try{
                EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
                EmployeeMapper mapper2 = openSession2.getMapper(EmployeeMapper.class);
    
                Employee emp01 = mapper.getEmpById(1);
                System.out.println(emp01);
                openSession.close();
    
                //第二次查询是从二级缓存中拿到的数据，并没有发送新的sql
                Employee emp02 = mapper2.getEmpById(1);
                System.out.println(emp02);
                openSession2.close();
            }finally{
    
            }
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpemhpcWlhbmcxMjE3_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][20190421164915869.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpemhpcWlhbmcxMjE3_size_16_color_FFFFFF_t_70]: /images/20220216/fff2f50e86364d0699efed24cb756a75.png
[20190421164915869.png]: /images/20220216/11d5db4f553d49e99b3bc03c96ae1078.png