Class.forName("org.postgresql.Driver");
    String conString = "jdbc:postgresql://" + host + ":" + port + "/" + DBName +
            "?user=" + user + "&pass=" + pass;
    String conString1 = "jdbc:postgresql://" + host + ":" + port2 + "/" + DBName2 +
            "?user=" + user + "&pass=" + pass;

      c = DriverManager.getConnection(conString);
      c2 = DriverManager.getConnection(conString1);

      st = c.createStatement();
      st2 = c2.createStatement();

      List<ResultSet> resultSets = new ArrayList<>();
      resultSets.add(st.executeQuery(query));
      resultSets.add(st2.executeQuery(query2));
      ResultSets rs = new ResultSets(resultSets);
      while (rs.next()){
        for(int i = 1 ; i <= 40 ; i++){
          TotalHarmVaArrL.add(rs.getDouble("h",i));
          TotalHarmVbArrL.add(rs.getDouble("h",i));
          TotalHarmVcArrL.add(rs.getDouble("h",i));
        }
      }

class ResultSets {

 private java.util.List<java.sql.ResultSet> resultSets;

    private java.sql.ResultSet current;


    public ResultSets(java.util.List<java.sql.ResultSet> resultSets) {
        this.resultSets = new java.util.ArrayList<>(resultSets);
        current = resultSets.remove(0);
    }

    public boolean next() throws SQLException {
        if (current.next()) {
            return true;
        }else if (!resultSets.isEmpty()) {
            current = resultSets.remove(0);
            return next();
        }
        return false;
    }
    public Double getDouble(String h, int number) throws SQLException{
        return current.getDouble("h" + number);
    }

void close() throws SQLException {
    current.close();
  }
}