Getting a problem while using database connectivity

[sushil parti]

Hi,
i am a newbie to java... i have just joined an institute for that and the tutor is teaching java on netbeans
but i liked eclipse more. So i am doing on that.
A few days ago my tutor taught us database connectivity without using DSN so that it could be deployed easily which i have implemented in the code below
But i am getting an error :

java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

I have checked the code again and again but can't find the error in it. Further my teacher is not able to find the error and is blaming the eclipse for that and is saying it is due to some internal error of laptop. I am not sure what to do ..

please help me a soon as possible..here is the code.. :

package hardwareSales;

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

public class Login implements ActionListener
{
	JFrame f;
	JPanel p1,p2,p3,p4,p5,p6,p7;
	JButton b1,b2;
	JTextField t1;
	JLabel l1,l2,l3,l4;
	JPasswordField pw1;
	Connection con;
	Statement stmt;
	ResultSet rs;
	
	public void go()
	{
		l1=new JLabel("User");
		l2=new JLabel("Password");
		l3=new JLabel("LOGIN INFO");
		l4=new JLabel("           ");
		f=new JFrame();
		p1= new JPanel();
		p2= new JPanel();
		p3= new JPanel();
		p4= new JPanel();
		p5= new JPanel();
		p6= new JPanel();
		p7= new JPanel(); 
		b1= new JButton("Login");
		b2=new JButton("Reset");
		t1= new JTextField();
		pw1= new JPasswordField();
		
		b1.addActionListener(this);
		b2.addActionListener(this);
		t1.setMinimumSize(new Dimension(200,20));
		t1.setMaximumSize(new Dimension (200,20));
		pw1.setMinimumSize(new Dimension(200,20));
		pw1.setMaximumSize(new Dimension(200,20));
		l1.setMinimumSize(new Dimension (100,20));
		l1.setMaximumSize(new Dimension(100,20));
		l2.setMinimumSize(new Dimension (100,20));
		l2.setMaximumSize(new Dimension(100,20));
		p1.setLayout(new BoxLayout(p1,BoxLayout.X_AXIS));
		p2.setLayout(new BoxLayout(p2,BoxLayout.X_AXIS));
		p3.setLayout(new BoxLayout(p3,BoxLayout.X_AXIS));
		p1.add(l1);
		p1.add(t1);
		p2.add(l2);
		p2.add(pw1);
		p3.add(b1);
		p3.add(l4);
		p3.add(b2);
		p5.add(l3);
		p4.setLayout(new BoxLayout(p4,BoxLayout.Y_AXIS));
		p4.add(p5);
		p4.add(p1);
		p4.add(p2);
		p4.add(p7);
		p4.add(p3);
		p4.add(p6);
		
		
		f.add(p4);
		f.setVisible(true);
		f.setSize(350,150);
		f.setLocation(400,280);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
	}
	
	@SuppressWarnings("deprecation")
	public void actionPerformed(ActionEvent e )
	{
		if(e.getSource()==b1)
		{
			String query,uname,pass,db;
			uname=t1.getText();
			pass=pw1.getText();
			
			query="select * from Login where username='"+uname+"'and password='"+pass+"'";
			
			try
			{
				DriverManager.registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver());
				db=".//hardware.accdb";
				String url = "jdbc:odbc:Driver={ Microsoft Access Driver( *.mdb, *.accdb)};DBQ="+db+";DriverID=22;READONLY=false";
				con=DriverManager.getConnection(url);
				
				stmt=con.createStatement();
				rs=stmt.executeQuery(query);
				
				if(rs.next())
				{
					System.out.println("Done!!!!");
				}
									
			}
			
			catch(Exception e1)
			{
				System.out.println("I m in catch");
				e1.printStackTrace();
			}
			
		
		}
		
		
		if(e.getSource()==b2)
		{
			t1.setText("");
			pw1.setText("");
		}
		
	}
	public static void main(String[] args)
	{
		Login o1=new Login();
		o1.go();
	}

}

Please reply if any one here knows the solution......
Thank you

[Jan Cumps]

Welcome to JavaRanch, sushil.

Please read these instructions on how to use code tags to make your post more readable.
We have a general tutorial on how to ask questions.

Regards, Jan

[Ireneusz Kordal]

Hi,

try to change this line:

db=".//hardware.accdb"; 

and use an absolute pathname instead of relative, for example:

db="c:/path/hardware.accdb";

[sushil parti]

Hi Ireneusz
Thanks for replying....

i changed that relative address to have an absolute one .
But still it is not working properly..

Actually There is no compilation error. But when i click on login button after putting the username and password
the error comes.

any guesses what should i do

[Paul Sturrock]

The code you have is a little odd. This line:

DriverManager.registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver()); 

is a funny way of registering a driver, and kind of works against one of the principals of JDBC: that you code should be portable.

The error you see usually occurs when you are using a DSN rather than a trying a DSN-less connection. The error means that ODBC can't find a data source name. Given you have been working with DSN version previously, I would check the code you are actually running. Are there any old classes kicking about?

I'm not sure what the "DriverID=22;READONLY=false" in your connection string means - I've only ever seen it used (mis)using JDBC to connect to Excel. Try removing
it from the string.

[sushil parti]

Hi
thanks everybody for your help
well somehow my code is running again after i replaced it with following code
but i still can't get how. Does any body know??

   
if(e.getSource()==b1)
		{
			String url,uname,pass,db,query;
			ResultSet rs;
			Connection con;
			Statement stmt;
			uname = t1.getText();
			pass = pw1.getText();
			query = "select * from Login where username='"+uname+"'and password='"+pass+"'";
			
			try{
				DriverManager.registerDriver(new sun.jdbc.odbc.JdbcOdbcDriver());
				db=".//hardware.accdb";
				url="jdbc:odbc:DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};DBQ="+db+";DriverID=22;READONLY=false";
				con=DriverManager.getConnection(url);
				stmt=con.createStatement();
				rs=stmt.executeQuery(query);
				if(rs.next())
				{
					System.out.println("Mission Accomplished");
				}
				else
				{
					JOptionPane.showMessageDialog(f, "NO such record found...!!! try again");
					t1.setText("");
					pw1.setText("");
				}
			}
			catch(Exception e1)
			{
				
				e1.printStackTrace();
			}
		}
		

 

[Jeanne Boyarsky]

I can't easily tell what is different between the new and old code because the old code is long and unformatted.

I do want to point out that your application is vulnerable to SQL Injection where someone can enter SQL in the user/password fields and login even without a valid id. You really should be using a PreparedStatement.