数据库中redoundo的介绍
https://blog.csdn.net/u012414189/article/details/84036550?spm=1001.2101.3001.6650.14&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-14-84036550-blog-105471511.pc_relevant_multi_platform_whitelistv2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-14-84036550-blog-105471511.pc_relevant_multi_platform_whitelistv2&utm_relevant_index=20