I don't know if it's possible to grab the port. The one thing I found using google was:
PHP Code:
int iPort = GetConVarInt(FindConVar("hostport"));
but this requires you to use hostport in the command-line while starting up your server. To test this out and see if it works for you, change your OnPluginStart code to this:
PHP Code:
public void OnPluginStart()
{
SQL_TConnect(SQLCallback_Connect, "ckSurf");
int iPort = GetConVarInt(FindConVar("hostport"));
LogMessage("This servers port is %i", iPort);
}
Then look in your console or your log files and see what it says. If it shows "This servers port is " then it will not work, otherwise I'll code something up for you.