百度原因是：mysql8 之前的版本中加密規則是mysql_native_password,而在mysql8之後,加密規則是caching_sha2_password,
解決問題方法：把mysql用戶登錄密碼加密規則還原成mysql_native_password.
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER; #修改加密規則
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456'; #更新一下用戶的密碼