Solved

How to Update a Record from a database?

Posted on 2003-11-27
5
277 Views
Last Modified: 2010-03-31
hie, i have a very simple question, i am a java beginner, i am able to add a record to a database from my java which i am using MS Access as my database, i am able to add a record by using this code...
public void add() { // Add New Guest to Database
      
       String a = super.getLastName();
       String b = super.getFirstName();
       String c = address.getAddress();
       String d = address.getCity();
       String e = address.getPostCode();
       String f = address.getState();
       String g = address.getCountry();
       String h = super.getPhone();
       String i = super.getFax();
       String j = super.getRemarks();

       openConnection();
        
        try
             {
                   Statement statement = connection.createStatement();
                               
                  String query = "INSERT INTO guest (guest_ID,lastname,firstname,address," +
                                       " city,postcode, state, country, phone," +
                                        " fax, remarks) VALUES ('" +
                                                a +"','" +
                                                b +"','" +
                                             c +"','" +
                                             d +"','" +
                                             e +"','" +
                                             f +"','" +
                                             g +"','" +
                                             h +"','" +
                                             i +"','" +
                                             j +"')";
                        
                  int result = statement.executeUpdate(query);
                  
                  if (result == 1) {
                         JOptionPane.showMessageDialog(null, "Insertion succesfull");
                   } else {
                         JOptionPane.showMessageDialog(null, "Insertion Not succesfull");
                   }
      
                   statement.close();
            }
         catch(SQLException sqlex) {
       
         }
       }


and now i want to retrieve back my record and i am searching by the guest_id, so when i want to update the cord, what should i write ?please give me some guide

it should be write as this
public void update() {

//the code
}
0
Comment
Question by:kennykoid
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
5 Comments
 
LVL 3

Expert Comment

by:InNoCenT_Ch1ld
ID: 9835286
something like:

            String query = "UPDATE addresses SET " +
                   "firstname='" + fields.first.getText() +
                   "', lastname='" + fields.last.getText() +
                   "', address='" + fields.address.getText() +
                   "', city='" + fields.city.getText() +
                   "', stateorprovince='" +
                   fields.state.getText() +
                   "', postalcode='" + fields.zip.getText() +
                   "', country='" + fields.country.getText() +
                   "', emailaddress='" +
                   fields.email.getText() +
                   "', homephone='" + fields.home.getText() +
                   "', faxnumber='" + fields.fax.getText() +
                   "' WHERE id=" + fields.id.getText();
                   output.append( "\nSending query: " +
                   connection.nativeSQL( query ) + "\n" );

            int result = statement.executeUpdate( query );
           
            if ( result == 1 )
               output.append( "\nUpdate successful\n" );
0
 
LVL 3

Accepted Solution

by:
InNoCenT_Ch1ld earned 20 total points
ID: 9835301
that's an example for you.
you can do like this:

               String query = "UPDATE guest SET" +
                                     "lastname='" + b +"' ," +
                                     "firstname="' + c +"' ," +
                                     //..and so on +
                                     "' WHERE guest_ID="a;

               int result = statement.executeUpdate(query);
               if(result == 1)
                    //update successful...(your code here)
                                   

hope it helps ;)
-Child-
0
 

Expert Comment

by:KarthikAnandan
ID: 9835380
Hi,
  First you have to search whether the given guest_id is present or not. Then only u can update a record.

      String a = super.getLastName();
      String b = super.getFirstName();
      String c = address.getAddress();
      String d = address.getCity();
      String e = address.getPostCode();
      String f = address.getState();
      String g = address.getCountry();
      String h = super.getPhone();
      String i = super.getFax();
      String j = super.getRemarks();


Now to Search for the given guest_id

the query will be
        String query =  "select 1 from guest where guest_ID = '"+a+"'

If this query returns 1. then the Guestid is present. Now you have to update the table. for this
the query will be
     
"UPDATE guest set firstname = '"+a+"', lastname = '"+b+"', address = '"+c+"',city='"+d+"',
                        stateorprovince='"+e+"', postalcode = '"+f+"',country = '"+g+"',
                        emailaddress = '"+h+"',homephone = '"+i+"', faxnumber = '"+j+"' WHERE
                         guest_id = a;

this query will update the table with the specified guest id.

Now, If the first query, that is checking for guest_id in the table, if this fails then that means that the record is not present. The guest id is not present. So we have to go for inserting a new Guest rather than updating. The insert query is the same as what you said.
If you have any doubt over this then reply plz..

0
 
LVL 30

Expert Comment

by:Mayank S
ID: 9835743
>> First you have to search whether the given guest_id is present or not. Then only u can update a record.

He says:

>> i want to retrieve back my record and i am searching by the guest_id,

Anyway, kennykoid, is it simply the update part which is troubling you or something else? If you're being able to insert a row, then I don't see a problem with updating it - merely, the query will change in your add () code. Is it something else that you want to know?

Mayank.
0
 
LVL 3

Expert Comment

by:InNoCenT_Ch1ld
ID: 9835794
KarthikAnandan>> hello, you're just repeating my comment...but more complete. so i will hate you for the rest of my life if i dont get the pts.. hehehee ;p (just kidding)

-Child-
0

Featured Post

Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Suggested Courses

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question