Problem with my data retrieval method

Question

I keep getting the following error message "SQLError:java.sql.SQLException: [Microsoft][ODBC Driver Manager] Invalid cursor state" when I'm testing a method which executes a query on a database. The database has been setup and all that. I know because I've got methods setup which update the database by performing SQL queries etc.
This query I'm performing doesn't seem to work. Basically I'm retrieving all the orders for a certain customer. Each customer is identified by a customer ID, and the order has the following other fields: Order ID, model, trim and date. So basically I retrieve the other details for one customer.
Here is the code for the method I'm using:
public void getOrder(int customer)
try
Statement stmt = conn.createStatement();
ResultSet rs4 = stmt.executeQuery("SELECT * FROM orders WHERE id_customer= "+customer);
System.out.println("*** Order ID: "+rs4.getInt("id_order")+" Model: "+rs4.getString("model")+" Trim: "+rs4.getString("trim")+" Date: "+rs4.getDate("order_date")+" ***");
catch(SQLException sqle)
System.err.println("SQLError:"+sqle);
catch(NullPointerException npe)
System.out.println("No database connection exists, please make sure you have successfully connected to a database");
also I've double checked the name of all the fields and tables and they're all correct in the code. So there's no mistake there.
any idea what's going wrong? how do I correct it? what does "invalid cursor state" mean?

Answer 1

import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import javax.swing.JOptionPane;
import java.util.Iterator;
import java.sql.*;
public class CarCatalogue
// instance variables
private Map modelRange;
private Map electives;
private Map accessories;
private Connection conn;
private String username = "";
private String password = "";
private String url = "";
private boolean condition = false;
* Constructor for objects of class CarCatalogue
public CarCatalogue()
// initialise instance variables
modelRange = new HashMap();
electives = new HashMap();
accessories = new HashMap();
public void addVariant(String model, String trim, double price)
modelRange.put(new String(model+" "+trim), new Double(price));
public void addChoice(String model, String trim, String category,
boolean opt, String description, double price)
Map categoryMap;
Set optionSet;
String v = new String(model+" "+trim);
if (!(modelRange.containsKey(v)))
JOptionPane.showMessageDialog
(null,"Unknown variant: "+v+
"\nUnable to add option details to catalogue.");
else
if (opt)
// Are there any options for this variant yet?
if (accessories.containsKey(v))
categoryMap = (Map)accessories.get(v);
else // this is the first option for the variant
categoryMap = new HashMap();
accessories.put(v.toString(),categoryMap);
// Are there existing options for this category?
if (categoryMap.containsKey(category))
optionSet = (Set)categoryMap.get(category);
optionSet.add(new Choice(description,price));
else // set up a new category of options
optionSet = new HashSet();
optionSet.add(new Choice(description,price));
categoryMap.put(category,optionSet);
else // Do exactly the same as above, but in the electives map
// Are there any options for this variant yet?
if (electives.containsKey(v))
categoryMap = (Map)electives.get(v);
else // this is the first option for the variant
categoryMap = new HashMap();
electives.put(v.toString(),categoryMap);
// Are there existing options for this category?
if (categoryMap.containsKey(category))
optionSet = (Set)categoryMap.get(category);
optionSet.add(new Choice(description,price));
else // set up a new category of options
optionSet = new HashSet();
optionSet.add(new Choice(description,price));
categoryMap.put(category,optionSet);
public double getPrice(String model, String trim)
double price = 0;
String k = new String(model+" "+trim);
if ((modelRange.containsKey(k)))
Double d = (Double)modelRange.get(k);
price = d.doubleValue();
return price;
else
JOptionPane.showMessageDialog(null,"No such model and trim combo exists\nPlease enter a valid combo", "ERROR",JOptionPane.ERROR_MESSAGE);
return price;
public Set getAccessoryCategories(String model, String trim)
String k = new String(model+" "+trim);
if ((accessories.containsKey(k)))
Map m = (Map)accessories.get(k);
Set s = new HashSet (m.keySet());
return s;
else
JOptionPane.showMessageDialog(null,"No such model and trim combo exists\nPlease enter a valid combo", "ERROR",JOptionPane.ERROR_MESSAGE);
return null;
public Set getElectiveCategories(String model, String trim)
String k = new String(model+" "+trim);
if ((electives.containsKey(k)))
Map m = (Map)electives.get(k);
Set s = new HashSet (m.keySet());
return s;
else
JOptionPane.showMessageDialog(null,"No such model and trim combo exists\nPlease enter a valid combo", "ERROR",JOptionPane.ERROR_MESSAGE);
return null;
public Set getChoices(String model, String trim, boolean b, String category)
String k = new String(model+" "+trim);
String c = category;
if((modelRange.containsKey(k)))
if (b == true)
Map m = (Map)accessories.get(k);
if (m.containsKey(c))
Set s = (HashSet)m.get(c);
return s;
else
JOptionPane.showMessageDialog(null,"No such accessory category exists\nPlease enter a valid category", "ERROR",JOptionPane.ERROR_MESSAGE);
return null;
else
Map m2 = (Map)electives.get(k);
if (m2.containsKey(c))
Set s1 = (HashSet) (m2.get(c));
return s1;
else
JOptionPane.showMessageDialog(null,"No such elective category exists\nPlease enter a valid category", "ERROR",JOptionPane.ERROR_MESSAGE);
return null;
else
JOptionPane.showMessageDialog(null,"No such model and trim combo exists\nPlease enter a valid combo", "ERROR",JOptionPane.ERROR_MESSAGE);
return null;
public void connectTo(String user, String pass, String DatabaseName)
try
url = "jdbc:odbc:" + DatabaseName;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection(url, user, pass);
username = user;
password = pass;
Statement s = conn.createStatement();
Statement s2 = conn.createStatement();
ResultSet rs = s.executeQuery("SELECT * FROM modelrange");
while(rs.next())
addVariant(rs.getString("model"),rs.getString("trim"),rs.getDouble("price"));
ResultSet rs2 = s2.executeQuery("SELECT * FROM Selection");
while(rs2.next())
addChoice(rs2.getString("model"),rs2.getString("trim"),rs2.getString("category"),rs2.getBoolean("opt"),rs2.getString("description"),rs2.getDouble("price"));
catch(ClassNotFoundException cnfex)
System.err.println("Failed to load ODBC driver");
cnfex.printStackTrace();
condition = true;
catch(SQLException sqlex)
System.err.println("Unable to connect to database");
sqlex.printStackTrace();
System.out.println("SQL error:" + sqlex);
condition = true;
if(!condition)
System.out.println("Connection established");
else
System.out.println("Connection failed");
condition = false;
public void addCustomer(String fname, String sname, String phonenumber, String email)
try
Statement st1 = conn.createStatement();
st1.executeQuery("INSERT INTO customer (firstname, surname, telephone, username, email) VALUES('"+fname+"','"+sname+"','"+phonenumber+"','"+username+ "','"+email+"');");
catch(SQLException sqle)
System.out.println("Customer added successfully");
public void addOrder(int CustID, String model, String trim, String date)
try
Statement st = conn.createStatement();
Statement st2 = conn.createStatement();
ResultSet rs3 = st.executeQuery("SELECT * FROM customer");
Map out = new HashMap();
while(rs3.next())
String ID = ""+rs3.getInt("id_customer");
out.put(ID, null);
if(!(out.containsKey(""+CustID)))
System.out.println("No such customer with the specified ID exists, please enter a valid ID");
else
String key = new String(model+" "+trim);
if(modelRange.containsKey(key))
ResultSet rs1 = st2.executeQuery("INSERT INTO orders(id_customer, model, trim, order_date) VALUES("+CustID+",'"+model+"','"+trim+"',#"+date+"#);");
else
System.out.println("No such model and trim exists, please make sure the values entered are valid and correct");
catch(SQLException sqle)
System.out.println("Order completed successfully");
System.err.println("SQLError:"+sqle);
catch(NullPointerException npe)
System.out.println("No database connection exists, please make sure you have successfully connected to a database");
public void getOrder(int customer)
try
Statement stmt = conn.createStatement();
ResultSet rs4 = stmt.executeQuery("SELECT * FROM orders WHERE id_customer= "+customer);
System.out.println("*** Order ID: "+rs4.getInt("id_order")+" Model: "+rs4.getString("model")+" Trim: "+rs4.getString("trim")+" Date: "+rs4.getDate("order_date")+" ***");
catch(SQLException sqle)
System.err.println("SQLError:"+sqle);
catch(NullPointerException npe)
System.out.println("No database connection exists, please make sure you have successfully connected to a database");
this is all the code in my class