[mybatis]缓存_一级缓存_一级缓存失效的四种情况

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1.sqlSession不同

 @Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);SqlSession  sqlSession02   =  sqlSessionFactory.openSession();EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);Employee emp02 =   mapper02.getEmpById(1);System.out.println(emp02);System.out.println(emp01==emp02);sqlSession02.close();}finally {sqlSession01.close();}}

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2.sqlSession相同，查询条件不同

    @Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);//            SqlSession  sqlSession02   =  sqlSessionFactory.openSession();
//
//            EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);Employee emp02 =   mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);//            sqlSession02.close();}finally {sqlSession01.close();}}

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3.sqlSession相同，两次查询之间执行了增删改操作（这次增删改可能对当前数据有影响）

 @Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);//            SqlSession  sqlSession02   =  sqlSessionFactory.openSession();
//
//            EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);mapper01.addEmp(new Employee(null,"testCache","cache","1"));System.out.println("数据添加成功");Employee emp02 =   mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);//            sqlSession02.close();}finally {sqlSession01.close();}}

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4.sqlSession相同，手动清除了一级缓存（缓存清空）

    @Testpublic void test05() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession01 = sqlSessionFactory.openSession();try{EmployeeMapper mapper01 = sqlSession01.getMapper(EmployeeMapper.class);Employee emp01 = mapper01.getEmpById(1);System.out.println(emp01);//            SqlSession  sqlSession02   =  sqlSessionFactory.openSession();
//
//            EmployeeMapper mapper02 = sqlSession02.getMapper(EmployeeMapper.class);//            mapper01.addEmp(new Employee(null,"testCache","cache","1"));

            System.out.println("数据添加成功");sqlSession01.clearCache();Employee emp02 =   mapper01.getEmpById(2);System.out.println(emp02);System.out.println(emp01==emp02);//            sqlSession02.close();}finally {sqlSession01.close();}}