Java application- database related concept question

hi Friends,
I have 2 concept related questions,can someone please help me on how to implement them.I am making a java-based VOTING application.First thing,I am making a generic application,so I
don't know how many contestants would be there in each contest.
So,how can I design my database table??Should I try to create a database table on the fly,depending upon how many contestant are there to participitate??
Secondly,if somebody sends a vote like "contest_name contestant_name",I want to increment the counter of that particular person by one.So,should i have a separate database table,with the
name of all the contestant and their repective counters.What if somebody sends a wrong contestant name,do i need to query the database for that too,or i can store beforehand all the contestant names in the session or somewhere else.........please help
Thanks

Layer 4.

Similar Messages

Two related questions: ColdFusion 10/Java applications and J2EE supported servers

I have two related questions:
1. CF10 and integration with Java Web applications
We have a couple of Java applications running on JRun and interfacing with CF9 applications. The JRun clusters were created through the JRun Admin and, apart from lack of Axis 2.0 support, have served us well for years now. And, as would be the case, the ColdFusion9/Java/Flash application is a critical public-facing application that the business uses for bidding on projects.
It appears that with ColdFusion 10 on Tomcat, we will not be able to run those Java applications on a Tomcat-CF10 JVM cluster. Is this correct? IF so, what are our options?
2. J2EE Application Servers supported by Adobe for CF10
Which of these is correct?
A. This URL (http://www.adobe.com/products/coldfusion-enterprise/faq.html) states "ColdFusion 10 supports IBM® WebSphere, Oracle® WebLogic, Adobe JRun, Apache Tomcat, and JBoss."
B. This URL (http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/products/coldfusion/pdfs/cf1 0/coldfusion10-support-matrix.pdf) states:
"J2EE application servers: WebLogic Server 10.3, 11.1, WebSphere Application Server 7, ND 7 JBoss 5.1, 6.0, 7.1.0"
I *think* "A" above is wrong re. support for Adobe JRun. It does not specify a version of Apache Tomcat unless it is simply referring to the custom version the comes with CF10.
Option "B" above shows no support of Adobe JRun or 'standard' Apache Tomcat.
Thanks,
Scott

Question 1 above was answered: "No support for Java web applications under CF10's custom version of Tomcat"
Question 2: No answer yet: Is Apache Tomcat (NOT Adobe's customized version) supported for CF10 J2EE deployment? I do not see any installation instructions on how to install CF10 on Apache Tomcat 6 or 7.
Is anybody using Apache Tomcat as their J2EE app servers and, again, NOT Adobe's customized/limited version?
Thanks,
Scott

Is database Engine necessary or should I use one in my Java application?

I am writing a program which similar to a telephone directory kind of application. I have a database and I am thinking to use JDBC with mySQL for the database.
My question is that later when this program is ready and I am going to burn it to CD, what will be happen with mySQL? Can I add mySQL (or a similar program)?
Is it not better to make a database by Java objects or arrays within Java? What is the smart way to this when it comes to a program which in the background you have database??? Thank you for sharing your expertise...

I am writing a program which similar to a telephone
directory kind of application. I have a database and
I am thinking to use JDBC with mySQL for the
database.
My question is that later when this program is ready
and I am going to burn it to CD, what will be happen
with mySQL? Can I add mySQL (or a similar program)?You can, but will users want that? Are you better off allowing users to work with any relational database they wish?
>
Is it not better to make a database by Java objects
or arrays within Java? Unless you plan on writing a relational database and SQL engine on your own, the best bet is to get a real relational database.
Hypersonic SQL is small and embeddable in Java. Cloudscape might be good, too. Derby is going to be part of Java 6, unfortunately. PostgreSQL is a terrific relational database that's free.
What is the smart way to this
when it comes to a program which in the background
you have database??? Thank you for sharing your
expertise...The smart thing is to get a real relational database and forget about doing it yourself. Databases are far more complex than a few arrays or objects.
%

Java Usage Concept Questions

I have a java Command line running program. Which allow input/edit data of clients and store them into a Flat file. The problem is that i have to make a GUI, ( a thin web based client ) and using only HTML and Javascript.
The next step is the db should be frontended by servlet or JSP that interact with thin client to perform the database retrievals.
Now my concept Questions:
1. Is it possible to communicate to a Java Program using HTML and Javascript? If so, any exampler, pointers?
2. I was thinking of using HTML and Javascript to directly modify the Database. ( Since it is a flat file therefore nothing more than a txt file ) But isn't this side stepping the problem?
3. If i could modify the Flat file using HTML and Javascript only. Why would i need JSP and Servlets? And if i could do it with JSP and Servlets only why would i need the think client ( HTML bit )?
If all of above 3 are correct ( conceptialy ), what is the orginal command line java program for?
The last question is why i think i have the concept wrong. Please i am new to web programming so feel free to point out any error.

Hello,
You a little off on a few things. let me explain what each is used for to give you a better idea what each i used for.
HTML - Used to format data. Is static and can't do any File I/O and such
Javascript - Is usaually used for client side validation and some cool effects.
JSP - Is a scripting language that allows you to execute code on the server to create dynamic content and server side stuff like saving to a DB or a file
Servlets - Kinda like JSP but gives you more control over a few things. Usaually used for form processing and Servlet/Applet communication
for you application i would probably embed HTML/JavaScript for layout and validation into a JSP page for your display pages.. then build JSP pages to handle all you business logic and processing.
--Zer0C00L

Can i use single database connection in a hole java application?

can i use single database connection in a hole java application?.I have so many forms to use database connection.

Theoretically you can. Not only theoretically. I've seen lots of application which only uses one database connection (they were using, oracle or mysql)
The first reply given here assumed that the answer to
your question depends only on the design of your
application. That is not true.Yes it's true. Nothing in the original questions says that you aren't allowed to open or close the single connection that you have. It's looks more like the OP is interested in sharing a connection (i.e having a singleton or a connection pool with only one connection)
It does also depend on the behaviour of the database
in the background.
Most databases have a time out for connections that
are idle Not a problem. Most implementations of connection pools and applications which keeps a connection open have a timer which calls e.g. select * from dual (if you are using oracle) when the connection has been idle for X minutes.
(some, like db2 on z/OS, even cancel
connections, that are not idle, if they are open a
certain amount of time or have reached a given limit
of cpu seconds.)You would also have that problem if you had a connection pool with several connections.
In essence: If you have no control over the time
your application runs (and therefore your connection
is open) or over type or the configuration of the
database you are accessing, you can't do it.See above.
The closest thing to what you want would be using
PooledConnections, iif those are supported for the
database you want to access.Not true.
Kaj

I am in the process of doing a Proof Of Concept / Evaluating products that can help us build a Java Application to Convert a PDF document to a Searchable PDF. I wanted to check is there any simple JAVA API from Adobe to achive this ? Any direction in th

I am in the process of doing a Proof Of Concept / Evaluating products that can help us build a Java Application to Convert a PDF document to a Searchable PDF.
I wanted to check is there any simple JAVA API from Adobe to achive this ? Any direction in this regard is greatly appreciated.@

You can achieve this using LiveCycle PDF Generator JAVA API. You can find required code here:
Adobe LiveCycle * Quick Start (SOAP mode): Converting a Microsoft Word document to a PDF document using the Java API
In parameters:
//Set createPDF2 parameter values
String adobePDFSettings = "Standard";
String securitySettings = "No Security";
String fileTypeSettings = "Standard OCR";
"Standard OCR" file type setting will run OCR on input pdf. In the code, instead of doc file provide a pdf file. Resultant pdf will be searchable PDF i.e OCRed PDF.
Feel feel to ask any further questions.

Deployment issues-java desktop database application

hello,
i'm vasant...recently visited an online tutorial for creating java desktop database application
here is the URL [http://www.netbeans.org/kb/docs/java/gui-db.html#running-outside-IDE] ...
everything works fine...when building and executing the application from within the NetBeans IDE..6.7
but as instructed in that tutorial...when I tried to run the .jar file after exiting the netbeans IDE, it didnt run...
infact direction has been given in that tutorial for this in the last section....which says that i've to start Java DB from outside the Netbeans IDE...that's where difficulty arises....
i've no idea how to start Java DB manually...
i'd really appreciate if nybody der could...help me out plz
thanx

spring_patel wrote:
i really appreciate you trying to solve my problem..
but i think...my estion is fairly simple and straight forward...and i've provided every detail of my problem(if uv'e read my opening post of this thread)....
and as far as that link goes...i've already checked it b4 u guys mentioned it... as it is provided right there in the tutorial i've provided link of...
and i've tried my options b4 making use of this forum...and i didnt find a solution that's why i'm taking ur help..
nevertheless...i repeat my question...
there's a tutorial at this link...[http://www.netbeans.org/kb/docs/java/gui-db.html]...in it is described how to create a java desktop database applicaiton...
at the end of the tuorial there is a section called: "Building and Deploying the Application"
in that section they have instructed to exit netbeans IDE and try and run the application outside it...which is not happening
the reason they say is that i've to start Java DB from outside of the IDE...that is wat my problem is ..
i dont know how to start Java DB from outside the Netbeans ide...You are not telling us anything.
If I tell you "my automobile doesn't work" how do you know what is wrong. Instead I need to tell you one of the following.
1. The engine didn't start.
2. The wheel fell off.
3. The engine caught fire.
4. When I went to the driveway the car wasn't even there.
When you "run" something then something happens. When I run notepad from a console window if notepad is not in the path then I will get an error about command not found. if it is in the path then the command executes and notepad pops up. Even if I don't see notepad pop up I know that the command seemed to execute from the command window.
The above are examples of describing what you did and what did happen. In detail.
"It doesn't work" provides neither detail about how you ran it nor what did happen when you did attempt to run it.

Issue in Oracle 11g Database Change Notification for Java application

Hi,
I am trying to use Oracle's Database Change Notification in Java application.
I followed the sample application (+DBChangeNotification.java+ , Example 29-2), provided in the following link:
+[http://download.oracle.com/docs/cd/B28359_01/java.111/b31224/dbmgmnt.htm#CHDEJECF]+
I am able to see that the Registration of the SQL query is successful.
But, when I do changes to the table registered, notifications are not received in the Listener class (+DCNDemoListener.java+).
Ideally, the method DCNDemoListener.onDatabaseChangeNotification() should be invoked on any insert/update to the registered table. But this method is not getting invoked.
The execution has stopped in the following line of DBChangeNotification.java Class.
this.wait();
+==> The application was WAITing indefinitely in this line, as the NOTIFY() from DCNDemoListener.java was not executed.+
I am using VPN to connect to Oracel server. Remote Oracle Server is protected my firewall. Is this the reason for not sending the notifications from Oracle server?
The version of software used are given below:
Oracle Client - Oracle 11.1.0
JDK - 1.6
Oracle JDBC Driver - ojdbc6.jar
Can someone help me to resolve this issue?
Thanks in Advance.
Regards
Sam
Edited by: Ponsu on Apr 7, 2011 10:41 PM

Hi,
I am having similar issue. Where you able to resolve it.
I am also using the same example you were using.
I am using the following version.
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
Compatibility: 11.2.0.0.0
I do not see any notification coming back from the DB.
Appreciate your help.
Thanks & regards,
Ebe

Java dictionary database table in web dynpro application

Hi,
I want to access java dictionary database table in my web dynpro application in java.
Right now I have created one java dictionary DC.
and in that Dc i have created two database table .
Now I want to use this table in my web dynpro application.
Can anyone help me.

You can use the Dictionary Projects to create tables in Database. You must use codes to access these database tables that is created using Dictionary projects.
You have to use the DataSource in order to get connection ; Use Visual Administrator to see the data source name.
You can use the following code to access the database table.
ResultSet result = null;
try
     InitialContext initialcontext = new InitialContext();
     DataSource datasource = (DataSource)initialcontext.lookup("jdbc/<DataSourceName>");
        Connection connection = datasource.getConnection();
     Statement statement = connection.createStatement();
     result = statement.executeQuery( <Query>);
     connection.close();
} catch (NamingException e) {
     // TODO Auto-generated catch block
          e.printStackTrace();
} catch (SQLException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
Regards
   Vinod

How to access MS ACCESS database from Solaris running Java application

Hello I have a reqmt
My Java application is running on Weblogic server on Solaris 2.7 and now I want to connect to MS Access database running on Win NT.
How do I do that??
Any help is appreciated
Thanks
Suresh

You have to use a proxy server and client.
You can search for commercial solutions via the sun jdbc site or use RmiJdbc at http://www.objectweb.org/

Access database/ java application/ jdbc odbc

i am building an access database with a java application and get the following error message when i try to run the application. the log in window that i have does not have a password text field, only a field for the odbc name.
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Not a valid password.
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6106)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:6263)
at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(JdbcOdbc.java:2488)
at sun.jdbc.odbc.JdbcOdbcConnection.initialize(JdbcOdbcConnection.java:317)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:160)

User/password are usually necessary to set up the ODBC source. So you may need find out who set up your ODBC source. Or you need find the correct user/password and reset the ODBC source.
PC

Database related question

Hey all Experts out here,
I'm writing a situation here and i want the best solution available for that. I have to read some backup tables(around 15). Modify some Data in those tables(based upon certain conditions) and then insert that data to original table.
Heres the solution I'm thinking off.
Read Data from Backup table and save each row as a HashMap and All rows in a ArrayList.
Iterate through ArrayList and update the data in HashMap based on certain conditions and then extract the data from HashMap and insert it in original table.
I know this solution is not the best one. So can you guys please suggest me the best way to do it.
Thanks and Appreciate your time to read this.
sam

just to clarify I'm not sure how my solution is
client side. it is server side. you could do it
through whatever basic client comes with your
database or do it through a Java program if you
must.If you read all of the data from the RDBMS to a Java
application, that's client side. The RDBMS is the
server, the Java application is its client (even if
that Java application is a server in another context).right. but I suggested...
CREATE TABLES...
INSERT INTO SELECT
UPDATE
more INSERT INTO SELECT
DROP TABLES
so no client side data manipulation there.. you could write a stored procedure for the whole thing.

Java Application to connect to vdb3 database

Hi Folks,
I have to create a java application to connect to vdb3 oracle databse to support various transactions with menu options as below:
File menu(ALT F)
---Connect (ALT L)
---Exit (ALT E)
Data menu(ALT D)
---Query(ALT Q)
---Add Student(ALT A)
---Delete Student(ALT T)
---Update Student(ALT U)
Option menu(ALT O)
---Color(ATL C)
---Font (ATL N)
There is a STUDENT table with studid, firstname, lastname, major and age.
I have the following code for the GUI. I am getting the following errors. How do I go about from here? Please help.
Student.java:13: cannot find symbol
symbol : class ControlPanel
location: class Student
private ControlPanel controls;
^
Student.java:38: cannot find symbol
symbol: method GridLayout(int,int,int,int)
frame.add(panel, GridLayout(4,2,5,5));
^
Student.java:49: cannot find symbol
symbol : method addWindowListener(<anonymous java.awt.event.WindowAdapter>)
location: class javax.swing.JMenuItem
exititem.addWindowListener(
^
Student.java:69: cannot find symbol
symbol : method JMenuItem(java.lang.String)
location: class Student
JMenuItem queryItem = JMenuItem("Query");
^
Student.java:78: cannot find symbol
symbol : method showMessgaeDialog(<nulltype>,java.awt.Component,java.lang.String,int)
location: class javax.swing.JOptionPane
JOptionPane.showMessgaeDialog(null, add(queryoutput), "QUERY RESULTS", JOptionPane.INFORMATION_MESSAGE);
import javax.swing.*;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
public class Student extends JFrame
     private JTextArea out;
     private JDesktopPane desktop;
     private JTextArea queryoutput;
     private ControlPanel controls;
     public Student()
          super(" Student Database");
          //container c = getContentPane();
          desktop = new JDesktopPane();
          add(desktop);
          JMenu fileMenu = new JMenu("File");
          fileMenu.setMnemonic('F');
          JMenuItem connectItem = new JMenuItem("Connect");
          connectItem.setMnemonic('L');
          fileMenu.add(connectItem);
          connectItem.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
                    JInternalFrame frame = new JInternalFrame("Login", true, true, true, true );
                    MyPanel panel = new MyPanel();
                    frame.add(panel, GridLayout(4,2,5,5));
                    frame.pack();
                    desktop.add(frame);
                    frame.setVisible(true);
          JMenuItem exititem = new JMenuItem("Exit");
          exititem.setMnemonic('E');
          fileMenu.add(exititem);
          exititem.addWindowListener(
               new WindowAdapter()
                    public void WindowClosing (WindowEvent event)
                         System.exit(0);
          JMenuBar bar = new JMenuBar();
          setJMenuBar(bar);
          bar.add(fileMenu);
          queryoutput = new JTextArea(5,20);
          JMenu dataMenu = new JMenu("Data");
          dataMenu.setMnemonic('D');
          JMenuItem queryItem = JMenuItem("Query");
          queryItem.setMnemonic('Q');
          dataMenu.add(queryItem);
          dataMenu.addSeparator();
          dataMenu.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
                    JOptionPane.showMessgaeDialog(null, add(queryoutput), "QUERY RESULTS", JOptionPane.INFORMATION_MESSAGE);
          JMenuItem addstud = new JMenuItem("Add Student");
          addstud.setMnemonic('A');
          dataMenu.add(addstud);
          dataMenu.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
          JMenuItem delstud = new JMenuItem("Delete Student");
          addstud.setMnemonic('T');
          dataMenu.add(delstud);
          dataMenu.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
          JMenuItem updatestud = new JMenuItem("Update Student");
          addstud.setMnemonic('U');
          dataMenu.add(updatestud);
          dataMenu.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
          JMenu options = new JMenu("Options");
          options.setMnemonic('O');
          JMenuItem color = new JMenuItem("Color");
          addstud.setMnemonic('C');
          options.add(color);
          options.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
          JMenuItem font = new JMenuItem("Font");
          addstud.setMnemonic('N');
          options.add(font);
          options.addActionListener(
               new ActionListener()
                    public void actionPerformed(ActionEvent event)
class MyPanel extends JPanel
          private JLabel L1;
          private JLabel L2;
          private JLabel L3;
          private JTextField userid;
          private JPasswordField pw;
          private JTextField database;
          private JButton ok;
          private Connection connect;
          private JTextArea output;
          private String url;
     public MyPanel()
          L1 = new JLabel("User Id:");
          add(L1);
          userid = new JTextField(10);
          add(userid);
          L2 = new JLabel("Password:");
          add(L2);
          pw = new JPasswordField(10);
          add(pw);
          L3 = new JLabel("Database Name:");
          add(L3);
          database = new JTextField(10);
          add(database);
          ok = new JButton("OK");
          add(ok);
          ok.addActionListener(
          new ActionListener()
               public void actionPerformed(ActionEvent event)
               try {
     url = "jdbc:odbc:Student";
     Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
     connect = DriverManager.getConnection( url );
     output.append( "Connection successful\n" );
          catch ( ClassNotFoundException cnfex ) {
     // process ClassNotFoundExceptions here
     cnfex.printStackTrace();
     output.append( "Connection unsuccessful\n" +
cnfex.toString() );
     catch ( SQLException sqlex ) {
     // process SQLExceptions here
     sqlex.printStackTrace();
     output.append( "Connection unsuccessful\n" +
sqlex.toString() );
     catch ( Exception ex ) {
     // process remaining Exceptions here
     ex.printStackTrace();
     output.append( ex.toString() );
import javax.swing.*;
public class MainWindow
     public static void main( String args[])
          Student student = new Student();
          student.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          student.setSize(500,200);
          student.setVisible( true);
}

Error messages tell you everything you need to know (usually).
Student.java:13: cannot find symbol
symbol : class ControlPanel
location: class Student
private ControlPanel controls;
^
This means that the compiler cannot find the class ControlPanel. Does it exists. Is it in the same directory as your other files. Has it compiled correctly.
Student.java:38: cannot find symbol
symbol: method GridLayout(int,int,int,int)
frame.add(panel, GridLayout(4,2,5,5));
^
This tells you it cannot find the method GridLayout. I presume you meant to have a new in front of it. Besides the layout manager code should have been done prior to this and your code should be
frame.add(panel);Student.java:49: cannot find symbol
symbol : method addWindowListener(<anonymous java.awt.event.WindowAdapter>)
location: class javax.swing.JMenuItem
exititem.addWindowListener(
^
Once again the method addWindowListener cannot be found. JFrame has this method not JMenuItem. Probably need an ActionListener.
Student.java:69: cannot find symbol
symbol : method JMenuItem(java.lang.String)
location: class Student
JMenuItem queryItem = JMenuItem("Query");
^
Once again the compiler thinks you are trying to call a method called JMenuItem. You forgot new.
Student.java:78: cannot find symbol
symbol : method showMessgaeDialog(<nulltype>,java.awt.Component,java.lang.String,int)
location: class javax.swing.JOptionPane
JOptionPane.showMessgaeDialog(null, add(queryoutput), "QUERY RESULTS", JOptionPane.INFORMATION_MESSAGE);
Spelling!

Use EMCLI to get list of Application Servers related to Databases?

Hi,
Is it possible to use EMCLI to get from OEM a list of Application Servers related to Databases? If not, is there another method recommended by Oracle?
Thanks,
Yoni

Mohana,
I want my Replication Program to:
1. Create a copy of all objects stored in specific schema at the remote site in a local schema.
2. Be able to replicate the addition and removal of records.
Database link has been created between remote and local schema.You can query the remote site as if it is part of your local database and hence you can query the system tables to find out what objects are in remote site.
When query the system tables i want to look for objects that are owned by HAROON.

Connecting Java application to Oracle Database with JDBC

How can I connect my Java application using Oracle 11g database?
Please provide the steps involved along with the coding.

What kind of Java application? Stand alone/desktop? Or web? Do you need dedicated, individual connections, or connection pooling for 10,000 concurrent users?
You'll find a few clues in This Article [This Article|http://javawebdb.com/2012/01/30/connecting-a-java-servlet-to-a-database/]

Java application- database related concept question

Similar Messages

Maybe you are looking for