理解Sharding jdbc原理，看这一篇就够了

https://blog.csdn.net/wenyuan65/article/details/83715471?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control