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Student.java
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/**
*
* @author saketh
*/
import java.sql.*;
import javax.swing.JOptionPane;
public class Student extends javax.swing.JFrame {
Connection con;
PreparedStatement pst;
public void Connect() {
try {
Class.forName("com.mysql.cj.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/onlineexam?zeroDateTimeBehavior=CONVERT_TO_NULL","root","16092002");
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
public void insertData(String name, String rollNo, String branch) {
try {
// Check if the roll number already exists
String checkQuery = "SELECT * FROM student WHERE RollNo = ?";
pst = con.prepareStatement(checkQuery);
pst.setString(1, rollNo);
ResultSet rs = pst.executeQuery();
if (rs.next()) {
JOptionPane.showMessageDialog(this, "Roll number already exists", "Error", JOptionPane.ERROR_MESSAGE);
//System.out.println("Roll number already exists");
jTextField2.setText(""); // Student Name field
jTextField1.setText(""); // Roll NO field
jTextField3.setText(""); // Branch field
} else {
// Roll number does not exist, proceed with insertion
String query = "INSERT INTO student (StName, RollNo, Branch) VALUES (?, ?, ?)";
pst = con.prepareStatement(query);
pst.setString(1, name);
pst.setString(2, rollNo);
pst.setString(3, branch);
pst.executeUpdate();
//System.out.println("Data inserted successfully.");
jTextField2.setText(""); // Student Name field
jTextField1.setText(""); // Roll NO field
jTextField3.setText(""); // Branch field
QuizBox q = new QuizBox(rollNo);
q.setVisible(true);
}
} catch (SQLException ex) {
ex.printStackTrace();
} finally {
try {
if (pst != null) {
pst.close();
}
} catch (SQLException ex) {
ex.printStackTrace();
}
}
}
/**
* Creates new form Student
*/
public Student() {
initComponents();
Connect(); // Call the Connect method to establish the database connection
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jPanel1 = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jLabel1.setFont(new java.awt.Font("Segoe UI", 1, 28)); // NOI18N
jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel1.setText("Student Login");
jLabel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
getContentPane().add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(224, 49, 243, -1));
jPanel1.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED));
jPanel1.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jLabel2.setFont(new java.awt.Font("Segoe UI", 1, 18)); // NOI18N
jLabel2.setText("Student Name");
jPanel1.add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(63, 73, 137, 38));
jLabel3.setFont(new java.awt.Font("Segoe UI", 1, 18)); // NOI18N
jLabel3.setText("Roll NO");
jPanel1.add(jLabel3, new org.netbeans.lib.awtextra.AbsoluteConstraints(63, 143, 96, 27));
jLabel4.setFont(new java.awt.Font("Segoe UI", 1, 18)); // NOI18N
jLabel4.setText("Branch");
jPanel1.add(jLabel4, new org.netbeans.lib.awtextra.AbsoluteConstraints(63, 198, 83, 34));
jPanel1.add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(235, 143, 243, 38));
jTextField2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField2ActionPerformed(evt);
}
});
jPanel1.add(jTextField2, new org.netbeans.lib.awtextra.AbsoluteConstraints(235, 76, 243, 38));
jPanel1.add(jTextField3, new org.netbeans.lib.awtextra.AbsoluteConstraints(235, 199, 243, 38));
getContentPane().add(jPanel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 120, 590, 300));
jButton1.setFont(new java.awt.Font("Segoe UI", 1, 18)); // NOI18N
jButton1.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
getContentPane().add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(550, 470, 120, 49));
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// Retrieve data from the text fields
String name = jTextField2.getText().toUpperCase();
String rollNo = jTextField1.getText().toUpperCase();
String branch = jTextField3.getText().toUpperCase();
// Check if any field is empty
if (name.isEmpty() || rollNo.isEmpty() || branch.isEmpty()) {
JOptionPane.showMessageDialog(this, "All fields must be filled", "Error", JOptionPane.ERROR_MESSAGE);
} else {
// Insert data into the database
insertData(name, rollNo, branch);
// Open the next window or perform any other action
}
}
private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Student.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Student().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JTextField jTextField3;
// End of variables declaration
}