很好，错误消息清楚地说，访问被拒绝，所以hostname / username / password /

Well, the error message clearly says that access is denied, so either hostname/username/password/database is wrong or the user doesn't have the required permissions.

如何设置权限，在本例中为all：

How to set up permissions, in this example all:

GRANT ALL PRIVILEGES ON database_name TO user@host IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

Host是您要连接的地方。 ％可以用作wildchar。请参阅文档中的更多详细示例。 （您可以在错误消息btw中看到您的用户+主机）

Host is where you'd be connecting from. % can be used as a wildchar. See more detailed examples at the documentation. (you can see your user + host in the error message, btw)

另外，您应该在尝试使用数据库链接之前检查连接是否成功一个查询。

As a side note, you should check that connection was successful before trying to use the database link in a query.