SQLSTATE[HY000] [1130] Host 'DESKTOP-O0CRH8F' is not allowed to connect to this MySQL server

1.发生这种情况是由于没有MySQL没有赋予权限；

2.打开MySQL 5.7 Command Line Client，输入密码进入；

3.输入以下命令（大小写都可以）：

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION; 
mysql>flush privileges; 

mysql>exit;