Could someone please check my code

I really do not know whether this code is booking the appointment or not!
The table in the database is apptNo INTEGER PRIMARY KEY NOT NULL AUTO_INCREMENT, doctorNo INTEGER NOT NULL, time INTEGER NOT NULL, date DATE NOT NULL, patient_userID INTEGER NOT NULL,
dateBooked TIMESTAMP NOT NULL);
Is this completely wrong, its supposed to check the date and time entered in the form, and if they equal a date and time already stored in the database then it should return false, however i am unaware of how to write this code so u can check against different doctor's availabilities.
Does this mean i need an availability table?
BOOKAPPT.JSP
<%@ page language="java"
import="java.sql.*, java.io.*, java.util.*, connection.*"
errorPage="error.jsp" %>
<jsp:useBean id="myconn" class="connection.cmhconn"/>
<html>
<head>
<title>Appointment Booked</title>
</head>
<body>
<% if(date == "date")&&(time == "time")
return false;
%>
Unable to book Appointment please choose another, date and time!
<%
}else
 myconn.connect();
 String date = request.getParameter("apptdate");
 int time = Integer.parseInt(request.getParameter("appttime"));
 myconn.BookAppt(date, time);
 myconn.disconnect();
 myconn.connect();
 int doctorNo = Integer.parseInt(request.getParameter("doctorNo"));
 String dateBooked = request.getParameter("date");
myconn.addAppointment(doctorNo, dateBooked);
myconn.disconnect();
%>
Your Appointment has been booked!
<%
%>
</body>
</html>
The bean methods are here:
public ResultSet viewAppointment() throws SQLException, Exception
 ResultSet result = null;
 try
 String queryString = ("SELECT * FROM appointment;");
 Statement statement = con.createStatement();
 result =statement.executeQuery(queryString);
 catch (SQLException sqle)
 error = "SQLException: Could not execute query.";
 throw new SQLException(error);
 catch (Exception e)
 error = "Exception: An Exception occured while retrieving user data.";
 throw new Exception(error);
 return result;
public void addAppointment(int apptNo, int doctorNo, int time, String date, int patient_userID, String dateBooked)
 throws SQLException, Exception
 if (con != null)
 try
 PreparedStatement updateAppointment;
 updateAppointment = con.prepareStatement("insert into appointment values('', ?, ?, ?, ?, ?);");
 updateAppointment.setInt(1, apptNo);
 updateAppointment.setInt(2, doctorNo);
 updateAppointment.setInt(3, time);
 updateAppointment.setString(4, date);
 updateAppointment.setString(5, dateBooked);
 updateAppointment.setInt(6, patient_userID);
 updateAppointment.execute();
 catch (SQLException sqle)
 error = "SQLException: Update failed, possible duplicate entry";
 throw new SQLException(error);
}else
 error = "Exception: Connection to databse was lost!";
 throw new Exception(error);
public ResultSet viewBookAppt() throws SQLException, Exception
 ResultSet result = null;
 try
 String queryString = ("SELECT date, time FROM appointment;");
 Statement statement = con.createStatement();
 result =statement.executeQuery(queryString);
 catch (SQLException sqle)
 error = "SQLException: Could not execute query.";
 throw new SQLException(error);
 catch (Exception e)
 error = "Exception: An Exception occured while retrieving user data.";
 throw new Exception(error);
 return result;
Thanks in advanced

they are declared in the bean,
public ResultSet viewBookAppt() throws SQLException, Exception
     ResultSet result = null;
     try
          String queryString = ("SELECT date, time FROM appointment;");
          Statement statement = con.createStatement();
          result =statement.executeQuery(queryString);
     catch (SQLException sqle)
          error = "SQLException: Could not execute query.";
          throw new SQLException(error);
     catch (Exception e)
          error = "Exception: An Exception occured while retrieving user data.";
          throw new Exception(error);
     return result;
If this is wrong please tell me how to fix the erro
Thanks again

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