Need help regarding executeUpdate() for my database

Question

i am trying to update my database and set the records to false... althought it can execute, my records are still not changed according.. help appreciated !!
import java.io.*;
public class Index {
     private static String mTitle = "";
public Index() {
public static void main(String[] args)throws IOException {
// TODO code application logic here
System.out.println("===Start===");
Dbc dbc = new Dbc();
if(dbc.setCon()==0)
     System.out.println("Database load successful...");
else{
     System.out.println("Database load unsuccessful...");
     System.exit(1);
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
while(mTitle.length()<1 | mTitle==""){
     System.out.print("Enter movie title: ");
     mTitle = input.readLine();
     if(mTitle.length() > 0 && mTitle!=""){
          //System.out.println("You have entered: \"" + mTitle + "\"");
          System.out.println("Searching database...");
          int searchStatus = 0;
          searchStatus = dbc.readData(mTitle);
          if(searchStatus==0 && mTitle!=""){
               mTitle = "";
               System.out.println("Movie title not found...\n");
                    }else if(searchStatus==2 || searchStatus==3){
                         mTitle = "";
     }else
                    System.out.println("Please enter a valid movie title...\n");
System.out.println("===End===");
import java.sql.*;
import java.io.*;
public class Dbc{
     private Connection con;
     private boolean status;
     final static private String _driver = "sun.jdbc.odbc.JdbcOdbcDriver";
     final static private String dsn = "database";
     final static private String _user = "";
     final static private String _pass = "";
     final static private String _url = "jdbc:odbc:";
     //Establish database connection
     public int setCon(){
          // load the database driver
          try {
          Class.forName(_driver);
          catch (Exception e) {
               System.out.println("Load driver error");
               System.exit(1);
          //after loading the driver, establish a connection
          try {
               String s = _url + dsn;
               con = DriverManager.getConnection(s, user, pass);
               //System.out.println("connection is " + s);
          catch (Exception e) {
               e.printStackTrace();
               System.exit(1);
          return 0;
     public int readData(String title)throws IOException{
          ResultSet mTitle = null;
          ResultSet cost = null;
          ResultSet loanStatus = null;
          ResultSet mId = null;
          ResultSet ctg = null;
          try{
               Statement stmt1 = con.createStatement();
               Statement stmt2 = con.createStatement();
               Statement stmt3 = con.createStatement();
               Statement stmt4 = con.createStatement();
               Statement stmt5 = con.createStatement();
               Statement stmt6 = con.createStatement();
               mTitle = stmt1.executeQuery("SELECT MovieTitle FROM Table1 WHERE MovieTitle LIKE '%" + title + "%'");
               cost = stmt2.executeQuery("SELECT Cost FROM Table1 WHERE MovieTitle LIKE '%" + title + "%'");
               loanStatus = stmt3.executeQuery("SELECT LoanStatus FROM Table1 WHERE MovieTitle LIKE '%" + title + "%'");
               mId = stmt4.executeQuery("SELECT CatalogueNo FROM Table1 WHERE MovieTitle LIKE '%" + title + "%'");
               ctg = stmt5.executeQuery("SELECT Category FROM Table1 WHERE MovieTitle LIKE '%" + title + "%'");
               int num = 0;
               while(mTitle.next() && cost.next() && loanStatus.next() && mId.next() && ctg.next()){
                    status = loanStatus.getBoolean("LoanStatus");
                    System.out.println("=== Listing " + (num+1) + " ===");
                    System.out.println("Movie title: " + mTitle.getString("MovieTitle"));
                    System.out.println("Movie ID: " + mId.getString("CatalogueNo"));
                    System.out.println("Category: " + ctg.getString("Category"));
                    System.out.println("Rental price per day: SGD$" + cost.getInt("Cost"));
                    System.out.println("Availability: " + status);
                    System.out.println("===========================\n");
                    //stmt6.executeUpdate("UPDATE Table1 SET LoanStatus=false WHERE MovieTitle LIKE '%" + title + "%'");
                    num++;
               /*stmt1.close();
               stmt2.close();
               stmt3.close();
               stmt4.close();
               stmt5.close();*/
               if(num>0){
                    BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
                    if(num==1){
                         String string = "";
                         char choice;
                         while(string.equals("")){
                              System.out.print("Do you want to rent this movie? <Y/N> ");
                              string = input.readLine();
                              string = string.toLowerCase();
                              if(string.length() == 1 && string.charAt(0) == 'y'){               if(status){
                                        stmt6.executeUpdate("UPDATE Table1 SET LoanStatus=false WHERE MovieTitle LIKE '%" + title + "%'");
                                        }else{
                                             System.out.println("Sorry, DVD unavailable...");
                                             return 2;
                                   }else if(string.length() == 1 && string.charAt(0) == 'n'){
                                        return 2;
                                        }else{
                                             string = "";
                         }else if(num>1){
                              return 3;
                    return 1;
               catch(java.sql.SQLException e){
                    System.out.println(e.toString());
               return 0;
     }

Answer 1

Here's some ideas:
You dont need multiple statements and resultSets. Just one of each. Between reuse, close the statement and resultSet . Use each resultSet to read the data into a collection and then get your data out of the collection. Dont work directly with the resultSet. Also, instead of
"select name1 from person where personID=1234"
"select name2 from person where personID=1234"
you can combine them into one:
"select name1,name2 from person where personID=1234"
This line will not run because its commented out:
//stmt6.executeUpdate("UPDATE Table1 SET LoanStatus=false WHERE MovieTitle LIKE '%" + title + "%'");
Put System.out.println() above this line to print out the values of each
item in the if statement to see if stmt6 runs.
if(string.length() == 1 && string.charAt(0) == 'y'){ if(status){
stmt6.executeUpdate("UPDATE Table1 SET LoanStatus=false WHERE MovieTitle LIKE '%" + title + "%'");
This line is not good because it assumes mTitle, cost, loanStatus, etc
are all the same size list. They may be of different sizes.
while(mTitle.next() && cost.next() && loanStatus.next() && mId.next() && ctg.next()){
Statements and resultSets should be closed in a try/catch/finally block.
Also, see my example on:
http://forum.java.sun.com/thread.jspa?threadID=5193839&messageID=9769059#9769059