研究MyBatis与传统写法的不同

public List<User> getUsers() {
    Connection connection = null;
    Statement statement = null;
    ResultSet resultSet = null;
    List<User> userList = new ArrayList<>();
    
    try {
        // 获取数据库连接
        connection = DriverManager.getConnection(JDBC_URL, USERNAME, PASSWORD);
        
        // 创建Statement对象
        statement = connection.createStatement();
        
        // 执行SQL查询语句
        resultSet = statement.executeQuery("SELECT * FROM user");
        
        // 处理结果集
        while (resultSet.next()) {
            User user = new User();
            user.setId(resultSet.getInt("id"));
            user.setName(resultSet.getString("name"));
            user.setAge(resultSet.getInt("age"));
            userList.add(user);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        // 关闭资源
        try {
            if (resultSet != null) resultSet.close();
            if (statement != null) statement.close();
            if (connection != null) connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    return userList;
}

public List<User> getUsers() {
    List<User> userList;
    
    try (SqlSession sqlSession = MyBatisUtil.getSqlSession()) {
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        
        userList = userMapper.getUsers();
    }
    
    return userList;
}