为什么我无法通过Internet连接到我的数据库

I have an sql database called roottesting and I manage it at the ip 192.168.1.121. I also have a simple java application that connects to it (or rather, is supposed to connect to it) over the Internet with a user named 'user' that has a host of '%', which I know will make it usable for any computer that uses it. Here is the method in which my program connects to the database:I have an sql database called roottesting and I