此报错的原因则是没有开通权限

解决方案:
1、打开cmd命令面板
2、输入mysql -u root -p,之后输入密码(数据库root账户的密码)
3、开通权限

全部开放

GRANT ALL PRIVILEGES ON . TO ‘root’@‘%’ IDENTIFIED BY ‘password’ WITH GRANT OPTION;

指定ip开放

GRANT ALL PRIVILEGES ON . TO ‘root’@‘192.168.12.1’ IDENTIFIED BY ‘password’ WITH GRANT OPTION;

4、刷新权限flush privileges;
5、重启MySQLnet stop mysqlnet start mysql