/** try {
            con = DriverManager.getConnection("jdbc:mysql://reykez.pl:3306/<nickname>" , "<nickname>" , "<pass>");
            st = con.createStatement();
            rs = st.executeQuery("select * from USERS WHERE NICK = '" + nickname + "'");
            if(rs.last()) {
                rowCount = rs.getRow();
            }
            System.out.println(rowCount);
            if(rowCount >= 1) {
                return false; // nick zajęty
            } else {
                return true; //nick wolny
            }
        } catch(Exception e) { e.printStackTrace(); }
        return false; // nick jest zajęty **/