problem in updating data

[harsimran kochar]

i have a program that has a database in access and i want to update data but when i click on update button on my frame nothing happens no error no exception and no work.
here is my code

bUpdate=new JButton("Update");
	bUpdate.setBounds(275,600,100,50);
	c.add(bUpdate);
	bUpdate.addActionListener(this);


  public void actionPerformed(ActionEvent ae){
  Object o=ae.getSource();
 if(o.equals(bUpdate)){
	    	try{
	    	 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
		Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access DRIVER (*.mdb);DBQ=fddata.mdb");
	    		
                
     	PreparedStatement st=con.prepareStatement("update accthld set AName=?,DateOfOpeng=?,Address=?,ContactNo=?,TotalBalance=? where AccountNo=?");   
     		     st.setString(1,tAccountNo.getText());
		    st.setString(2,tAName.getText());
		st.setString(3,tDateofOpng.getText());
		st.setString(4,tAddress.getText());
						
		st.setString(5,tContactNo.getText());
		st.setInt(6,Integer.parseInt(tTotalBalance.getText()));
		int a=mAccthld.getRowCount();
		for (int i = 0; i<a; i++)
		mAccthld.removeRow(0);
     	                fillTable();
		int n=	st.executeUpdate();
			if(n>0)
			{
			JOptionPane.showMessageDialog(c,"updated");
								
								
								
			}
     		    	 
     		    	   	
						
     	    con.close();
	    		}
	    		catch(Exception ex){
	    			ex.printStackTrace();
	    		}
     				
	    	}

and code of mehod filltable is

	void fillTable(){
	            try {
	            	
                    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
	Connection con=DriverManager.getConnection("jdbc:odbc:DRIVER=Microsoft Access DRIVER (*.mdb);DBQ=fddata.mdb");
                    Statement st=con.createStatement();
                    ResultSet rs=st.executeQuery("Select * from accthld");
                 while(rs.next())
                 {
	    			Vector v=new Vector();
					v.add(rs.getString(1));
				    v.add(rs.getString(2));
        	        v.add(DateToString(rs.getDate(3)));
        		    v.add(rs.getString(4));
        			v.add(rs.getString(5));
        		    v.add(rs.getInt(6));
        		    mAccthld.addRow(v);
      
                
                
                 }     
        		  con.close();
    
					
	     	}
     	     catch (Exception ex) {
     	     	ex.printStackTrace();
			 }
                 	
           } 

		

[Jeanne Boyarsky]

When you say nothing happens, you mean executeUpdate() returns 0? If so, does the account id exist in the database?

[harsimran kochar]

even it doesnt give 0 as output