select user,host,password from user;

或者是否设置了authentication_string

select user,host,authentication_string,plugin from mysql.user;

2 如果没有设置，就重置密码

grant all privileges on *.* to 'yourname'@'localhost' identified by 'yourpassword'

或者对应第二种情况

ALTER USER 'XXXX'@'%' IDENTIFIED WITH mysql_native_password BY 'XXXXXXXX';

3 最后需要刷新下权限

flush privilege

4 如果是不重要的用户名，也可以通过新建用户赋予权限，

grant all privileges on *.* to 'xxx'@'localhost' identified by 'xxxx' ;