在服务器上执行如下操作：
# docker exec -it local_mysql_new mysql -uroot -p
然后输入数据库密码即可
Enter password:
登录成功后的信息：
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.7.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
命令中的：local_mysql_new为mysql 数据的容器名
