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Read data from access database...

Mike Eghtebas
Last Modified: 2012-08-14
Sample code exists to read data from an access database (books.mdb attached) in Windows 7 environment.

This code has some other information in it.

Question: How can I simplify the code just to read and display the content of author table in the database?

Also, is it necessary to create odbc connection in the computer I will be testing it? If so how to create such a connection?
Thank you.

import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;

public class DisplayAuthors extends JFrame {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "sun.jdbc.odbc.JdbcOdbcDriver";
   static final String DATABASE_URL = "jdbc:odbc:books";
   // declare Connection and Statement for accessing 
   // and querying database
   private Connection connection;
   private Statement statement;
   // constructor connects to database, queries database, processes 
   // results and displays results in window
   public DisplayAuthors() 
      super( "Authors Table of Books Database" );
      // connect to database books and query database
      try {
         // specify location of database on filesystem
         //System.setProperty( "db2j.system.home", "C:/Cloudscape_5.0" );
         // load database driver class
         Class.forName( JDBC_DRIVER );

         // establish connection to database
         connection = DriverManager.getConnection( DATABASE_URL );

         // create Statement for querying database
         statement = connection.createStatement();
         // query database
         ResultSet resultSet = 
            statement.executeQuery( "SELECT firstName, lastName, gpa FROM authors" );
         // process query results
         StringBuffer results = new StringBuffer();
         ResultSetMetaData metaData = resultSet.getMetaData();
         int numberOfColumns = metaData.getColumnCount();
         for ( int i = 1; i <= numberOfColumns; i++ )
            results.append( metaData.getColumnName( i ) + "\t" );
         results.append( "\n" );
         while ( resultSet.next() ) {
            for ( int i = 1; i <= numberOfColumns; i++ )
               results.append( resultSet.getObject( i ) + "\t" );
            results.append( "\n" );

         // set up GUI and display window
         JTextArea textArea = new JTextArea( results.toString() );
         Container container = getContentPane();

         container.add( new JScrollPane( textArea ) );
         setSize( 300, 100 );  // set window size
         setVisible( true );   // display window

      }  // end try
      // detect problems interacting with the database
      catch ( SQLException sqlException ) {
         JOptionPane.showMessageDialog( null, sqlException.getMessage(), 
            "Database Error", JOptionPane.ERROR_MESSAGE );
         System.exit( 1 );
      // detect problems loading database driver
      catch ( ClassNotFoundException classNotFound ) {
         JOptionPane.showMessageDialog( null, classNotFound.getMessage(), 
            "Driver Not Found", JOptionPane.ERROR_MESSAGE );            

         System.exit( 1 );
      // ensure statement and connection are closed properly
      finally {
         try {
         // handle exceptions closing statement and connection
         catch ( SQLException sqlException ) {
            JOptionPane.showMessageDialog( null, 
               sqlException.getMessage(), "Database Error", 
               JOptionPane.ERROR_MESSAGE );
            System.exit( 1 );

   }  // end DisplayAuthors constructor
   // launch the application
   public static void main( String args[] )
      DisplayAuthors window = new DisplayAuthors();      
      window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

}  // end class DisplayAuthors

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