2021-6-10 日报博客

个人博客

1.学到的东西

1.Mybatis的Dao层实现

1.1 传统开发方式

1.1.1编写UserDao接口

public interface UserDao {
    List<User> findAll() throws IOException;
}

1.1.2.编写UserDaoImpl实现

public class UserDaoImpl implements UserDao {
    public List<User> findAll() throws IOException {
        InputStream resourceAsStream = 
                    Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactory sqlSessionFactory = new 
                    SqlSessionFactoryBuilder().build(resourceAsStream);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        List<User> userList = sqlSession.selectList("userMapper.findAll");
        sqlSession.close();
        return userList;
    }
}

1.1.3 测试传统方式

@Test
public void testTraditionDao() throws IOException {
    UserDao userDao = new UserDaoImpl();
    List<User> all = userDao.findAll();
    System.out.println(all);
}

2.明日计划

代理开发方式

3.遇到的问题