[MySQL]SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

问题描述：

[PDOException]
SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

[PDOException]
PDO::__construct(): The server requested authentication method unknown to the client [caching_sha2_password]

解决方法：

alter user 'root'@'%' identified with mysql_native_password by '123456';
flush privileges;