docker compose 创建MySQL8后在容器里备份数据到宿主机（.sql文件）的方式
创建mysql8容器：
https://blog.csdn.net/wtl1992/article/details/145918129
https://blog.csdn.net/wtl1992/article/details/145918129
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创建mysql8容器：
https://blog.csdn.net/wtl1992/article/details/145918129https://blog.csdn.net/wtl1992/article/details/145918129
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