Question: Validation



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Aabid Nakhuda
1 Answer(s)      5 years and 4 months ago
Posted in : Java Beginners

I am developing a standalone application which requires me to save the email id and contact number (mobile number) in a database (MySQL). How do i perform a check using JAVA on the data before storing it in the database? PLEASE HELP!!!!!

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January 23, 2012 at 11:33 AM

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

class Form extends JFrame
JButton ADD;
JPanel panel;
JLabel label1,label2;
final JTextField text1,text2;;
label1 = new JLabel();
label1.setText("Email Id:");
text1 = new JTextField(20);

label2 = new JLabel();
label2.setText("Contact No:");
text2 = new JTextField(20);

ADD=new JButton("Add");

panel=new JPanel(new GridLayout(3,2));
ADD.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){
String value1=text1.getText();
String value2=text2.getText();
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root" );
        Statement st=conn.createStatement();
        ResultSet rs=st.executeQuery("select * from data where email='"+value1+"' and contactNo='"+value2+"'");
        int count=0;
            JOptionPane.showMessageDialog(null,"Invalid!Re-enter values!");
            text1.setText(" ");
            text2.setText(" ");
            st.executeUpdate("insert into data(email,contactNo) values('"+value1+"','"+value2+"')");
            JOptionPane.showMessageDialog(null,"Inserted Successfully!");
catch(Exception e){}
class FormDemo{
public static void main(String arg[]){
Form frame=new Form();
catch(Exception e)


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