今天在运行项目的时候出现：“Your password has expired. To log in you must change it using a client that supports expired passwords”这个错误，自己一看才知道是数据库密码过期引起的，这也导致了navicat等工具链接并打不开数据库，唯一的途径只能是修改数据库密码啦！
自己摸索了一早上，在网上也找了好几种方法来解决，最便捷也最好的方法是用命令来修改密码：
1.找到自己mysql安装的路径,如：C:\Program Files\MySQL\MySQL Server 5.7\bin
2.打开命令窗口：cmd 并进入mysql安装的目录bin文件夹下
C:\>cd Program Files\MySQL\MySQL Server 5.7\bin
3.先用之前的密码登陆mysql后台
C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecur
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.7.5-m15-log
Copyright (c) 2000, 2014, 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.
4.进入mysql后你的所有操作都不会被成功执行，提示如下：
mysql> show databases;
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
5.上面的提示让你必须修改了密码才能进行后续的操作，现在用命令修改密码：
mysql> show databases;
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
6.当成功执行上面的sql语句，证明你的mysql密码修改成功，即你可以用新的密码来使用数据库啦