mysql 无法连接提示 Authentication plugin 'caching_sha2_password' cannot be loaded
可能是密码没有设置或者，密码设置类型不符，可参考如下步骤解决
1 查看当前账户，和密码
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' ;