Check booking whether exist

Question

hi all, how can i check the booking exist or not before add booking??thanks
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
           Connection con = DriverManager.getConnection("jdbc:odbc:booking");
           PreparedStatement pstat = con.prepareStatement("insert into booking values(?,?,?,?,?,?,?,?)");
               memberno = tf1.getText();
               pstat.setString(1,memberno);
               facilityno= ch1.getSelectedItem();
               pstat.setString(2,facilityno);
               date = ch2.getSelectedItem();
               pstat.setString(3,date);
               time = ch3.getSelectedItem();
               pstat.setString(4,time);
               int no1 = (int) (Math.random()*10000);
            String referenceno = String.valueOf(no1);
            tf2.setText(referenceno);
              pstat.setString(5,referenceno);
            pstat.setString(6,"accepted");
               collectiondate = date;
            tf3.setText(collectiondate);
            pstat.setString(7,collectiondate);
               collectiontime = time;
               tf4.setText(collectiontime);
            pstat.setString(8,collectiontime);
               pstat.executeUpdate();
               tf1.setText("");
           pstat.close();
           con.close();
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Answer 1

2 errors,
method getSelectedItem(int), location:interface java.sql.ResultSet
String date1 = String.valueOf(rs.getSelectedItem(1));
method getSelectedItem(int), location:interface java.sql.ResultSet
String time1 = String.valueOf(rs.getSelectedItem(2));
thanks
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
           Connection con = DriverManager.getConnection("jdbc:odbc:booking");
        PreparedStatement ps = con.prepareStatement("select date, time from booking where date = ? and time = ?");
           ps.setString(1,ch2.getSelectedItem());
           ps.setString(2,ch3.getSelectedItem());       
        ResultSet rs = ps.executeQuery();
        while (rs.next()){
          String date1 = String.valueOf(rs.getSelectedItem(1));
          String time1 = String.valueOf(rs.getSelectedItem(2));
              if (date.equals(date1) && time.equals(time1)){
               JOptionPane.showMessageDialog(this,"booked.");
               booking bk = new booking();     
               bk.setVisible(true);
         rs.close();
         ps.close();
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