二級緩存

開啟全局二級緩存

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

去mapper.xml中配置使用二級緩存

<cache></cache> <cache eviction="FIFO" flushInterval="60000" readOnly="false" size="1024" ></cache>

• cache中的配置

• type = “”：指定自定義緩存的全類名；實現(xiàn)Cache接口即可；

我們的POJO需要實現(xiàn)序列化接口

測試

@Testpublic void testSecondLevelCache() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession = sqlSessionFactory.openSession();SqlSession sqlSession1 = sqlSessionFactory.openSession();try{EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);EmployeeMapper mapper1 = sqlSession1.getMapper(EmployeeMapper.class);Employee emp01 = mapper.getEmpById(1);System.out.println(emp01);sqlSession.close();Employee emp02 = mapper1.getEmpById(1);System.out.println(emp02);sqlSession1.close();}finally {sqlSession.close();}}

• 二級緩存失效

只有會話提交或者關(guān)閉以后，一級緩存中的數(shù)據(jù)才會轉(zhuǎn)移到二級緩存中

@Testpublic void testSecondLevelCache() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession = sqlSessionFactory.openSession();SqlSession sqlSession1 = sqlSessionFactory.openSession();try{EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);EmployeeMapper mapper1 = sqlSession1.getMapper(EmployeeMapper.class);Employee emp01 = mapper.getEmpById(1);System.out.println(emp01);Employee emp02 = mapper1.getEmpById(1);System.out.println(emp02);sqlSession.close();sqlSession1.close();}finally {}}

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