// --- connect to database - start ---
    try {
      Class.forName("com.mysql.jdbc.Drvier");

      this.connection = DriverManager.getConnection("jdbc:mysql://" + host + "/" + databse, username, password);
      System.out.println("Database connection established.");
    }
    catch(Exception e) {
      System.err.println("Cannot connect to database server!");
    }
    // --- connect to database - end ---