DBData() : port(3306) { }
DBData(const String& username, const String& password,
 const String& database, const String& host, 
 const String& collate, const String& lockId, int port = 3306) :
 username(username), 	password(password), database(database), 
 host(host), collate(collate), lockId(lockId), port(port) { }