deepin安装mysql密码问题解决方案

1.安装mysql
更新仓库：sudo apt-get update
安装：sudo apt-get install mysql-server mysql-client
问题：安装mysql5.7的过程中 无root密码设置提示 直接安装完成结束
2.不知道密码状态下打开mysql
查询mysql是否运行：sudo netstat -tap |grep mysql
(有显示就表示已运行)
备注：
mysql 打开(service mysql start)
关闭(service mysql stop)
重启命令(service mysql restart)
查询默认的用户名和密码：

        sudo cat /etc/mysql/debian.cnf
        baiguo@baiguo-PC:~$ sudo cat /etc/mysql/debian.cnf 
        # Automatically generated for Debian scripts. DO NOT TOUCH!
        [client]
        host     = localhost
        user     = debian-sys-maint
        password = F64nKZ233QkzL8v9
        socket   = /var/run/mysqld/mysqld.sock
        [mysql_upgrade]
        host     = localhost
        user     = debian-sys-maint
        password = F64nKZ233QkzL8v9
        socket   = /var/run/mysqld/mysqld.sock

备注：这样比较麻烦，无法复制密码，可以直接打开你的文件管理器，用管理员身份打开debian.cnf即可查看复制密码
利用默认账户进行登录：
mysql -u debian-sys-maint -p(文件中的密码，与p之间不要有空格)
3.进入mysql修该密码
这句必须：update mysql.user set plugin="mysql_native_password" where user="root";
设置root账户密码：update mysql.user set authentication_string=password('这里是你的密码') where user='root'and Host = 'localhost';
4.退出数据库
exit
重新启动数据库
sudo service mysql restart
用自己设置好的密码登录
mysql -u root -p
输入密码,成功登录,如下.

        baiguo@baiguo-PC:~$ mysql -u root -p
        Enter password: 
        Welcome to the MySQL monitor.  Commands end with ; or \g.
        Your MySQL connection id is 4
        Server version: 5.7.21-1 (Debian)

        Copyright (c) 2000, 2018, 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.

        mysql>