我们将用到两种方法：SQL和DAO类函数来混合实现它们，这样做的目地，我想可以使大家更加方便灵活的运用它们来完成你想要做的东西。-We will use two methods: SQL and the DAO class functions to mix to achieve them, head to do so, I think I can make you more convenient and flexible to use them to accomplish what you wa