Connection without username, password or database name

Question

I'm trying to find an automated way (for a given dbms) to check whether a server name and port number correctly identifies that the given dbms is running at that location.
For example, in MySQL, I can do something like:
DriverManager.getConnection("jdbc:mysql://" + serverName + ":" + port + "/");
So, I havent specified a username, password or database name. And this works (at least on my installation) by simply checking for an exception.
My question is: Can I always rely on this for MySQL or does it depend on how the MySQL dbms is configured?
What about MS SQL Server and Oracle?
Any help, much appreciated.

Answer 1

Your question was "Can I always rely on this for MySQ"No it wasn't. My question was:
"Can I always rely on this for MySQL or does it depend on how the MySQL dbms is configured?"
Its the bit between the "My question is: " and the question mark. I understand that if you chop the question in half then "no" is a valid answer but then thats not the same question.
and the answer is[i] No! If your abilitydepends on the MySQL configuration then the answer to
your question is still No because it means you
can't always rely on it.
Wrong again!
If I was to ask "does it depend on how the MySQL dbms is configured?" then the answer is yes.
I think "No, yes" is a better answer to the question. Although I think masijade answer is best.
But anway, thanks for your constructive reply.