MyBatis 框架分层架构

　　

 

 

MyBatis 简单案例：

     public SqlSessionFactory getsqlSessionFactory() throws IOException {
          String resource = "mybatis-config.xml";
          InputStream inputStream = Resources.getResourceAsStream(resource);
          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
          return sqlSessionFactory;
     }
     /**
      * 1、获取 sqlSessionFactory 对象
      *      
      * 2、获取 sqlSession 对象
      *       
      * 3、获取接口的代理对象（MapperProxy）
      *
      * 4、执行增删改查方法
      * @throws IOException
      */
     @Test
     public void test() throws IOException {
          //1、获取 sqlSessionFactory
          SqlSessionFactory sqlSessionFactory = getsqlSessionFactory();

          //2、获取 sqlSession 实例，能直接执行已经映射的 SQL 语句
          SqlSession sqlSession = sqlSessionFactory.openSession();

          try {
               //3、获取接口的实现类对象
               /**
                * 推荐使用
                * 会为接口自动的创建一个代理对象，代理对象去执行增删改查方法
                */
               EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);
               System.out.println(employeeMapper);
               System.out.println(employeeMapper.getClass());
               Employee emp = employeeMapper.getEmpById(1);
               System.out.println(emp);
          } finally {
               sqlSession.close();
          }
     }