N开发者_如何学运维ow I have a few classes that work with database. I wonder would it be better to have one (Data Access Layer, singleton) class that contain CRUD methods, database connection logic etc?
yes, you could use a singleton for that but why not use core data instead?
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
加载中,请稍侯......
精彩评论