Java Database Connectivity with MySQL | eclipse IDE | phpmyadmin | Advanced Java Programming

To connect Java application with the MySQL database, we need to follow below following steps.

In this example we are using phpmyadmin as the database. So we need to know following informations for the mysql database:

1) Driver class: The driver class for the mysql database is com.mysql.jdbc.Driver.

2) Connection URL: The connection URL for the mysql database is jdbc:mysql://localhost:3306/GSSSKHOKHAR where jdbc is the API, mysql is the database, localhost is the server name on which mysql is running, we may also use IP address, 3306 is the port number and GSSSKHOKHAR is the database name. 

3) Username: The default username for the mysql database is root.

4) Password: It is the password given by the user at the time of installing the mysql database. In this example, we are going to use root as the password.

Let's first create a table in the mysql database, Table name : Students

DROP TABLE IF EXISTS `Students`; CREATE TABLE `Students` ( `ID` int(50) AUTO_INCREMENT PRIMARY KEY NOT NULL, `StudentID` int(5) NOT NULL, `StudentPassword` int(5) NOT NULL, `StudentName` varchar(25) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL, `FatherName` varchar(25) CHARACTER SET utf8 COLLATE utf8_unicode_ci NULL, `ClassCode` int(2) NOT NULL DEFAULT '0' ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=latin1; -- -- Dumping data for table `Students`

LoginSystem.java

import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.sql.*; public class LoginSystem extends JFrame implements ActionListener { Button btnLogin = new Button("Login"); // Create Labels JLabel lblLoginSystem = new JLabel("Login System in Java"); JLabel lblUserName = new JLabel("User Name:"); JLabel lblPassword = new JLabel("Password:"); // Create Text Items JTextField txtUserName = new JTextField(20); JPasswordField txtPassword = new JPasswordField(20); JLabel lblResults = new JLabel(); // Constructor of the LoginSystem public LoginSystem() { super("Login System"); setLayout (null); Font font1 = new Font("Verdana", Font.BOLD, 14); Font font2 = new Font("Verdana", Font.BOLD, 16); lblLoginSystem.setBounds(200,10,200,50); add(lblLoginSystem); lblLoginSystem.setFont(font2); lblUserName.setBounds(20,80,75,25); add(lblUserName); txtUserName.setBounds(200,80,150,25); add(txtUserName); lblPassword.setBounds(20,120,75,25); add(lblPassword); txtPassword.setBounds(200,120,150,25); add(txtPassword); btnLogin.setBounds(200,180,150,25); btnLogin.setBackground(Color.orange); add(btnLogin); lblResults.setBounds(200,255,250,75); lblResults.setFont(font1); add(lblResults); // Add listeners for the buttons btnLogin.addActionListener(this); enableEvents(AWTEvent.WINDOW_EVENT_MASK); } // End of the remote class constructor LoginSystem() public void processWindowEvent(WindowEvent winEvt) { if(winEvt.getID() == WindowEvent.WINDOW_CLOSING) { setVisible(false); dispose(); System.exit(0); } } // To trap events for each buttons public void actionPerformed(ActionEvent actEvt) { if (actEvt.getSource() == btnLogin) { checkLogin(); try { Class.forName("com.mysql.cj.jdbc.Driver"); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/GSSSKHOKHAR","root","root"); Statement stmt=conn.createStatement(); // ResultSet rs=stmt.executeQuery("Select * From Students"); int eid; String pass; eid = 4474239; pass = "4474239"; ResultSet rs=stmt.executeQuery("select * from Students where ePunjabID ='" + eid + "' and StudentPassword= '" + pass + "'"); if(rs.next()) { String stu_name = rs.getString("StudentName"); System.out.println(stu_name+"\n"); } else { System.out.println("Wrong "); } stmt.close(); conn.close(); // System.out.println("Hello"); } catch(Exception e) { System.out.println(e.getMessage()); } } } // End of actionPerformed() method public void checkLogin() { String valUserName = txtUserName.getText(); String valPassword = String.valueOf(txtPassword.getPassword()); int val; if (valUserName.equals("Bintu") && valPassword.equals("12345")) { lblResults.setForeground(Color.BLACK); lblResults.setText("Welcome : " +valUserName); } else { lblResults.setForeground(Color.RED); lblResults.setText("Wrong Authentication"); } } // LoginSystem main() method public static void main(String [] args) { // Invoke the constructor of the LoginSystem class LoginSystem objLoginSystem = new LoginSystem(); objLoginSystem.setVisible(true); objLoginSystem.setSize(600,500); } // End of main() method } // End of LoginSystem class

To connect java application with the mysql database, mysqlconnector.jar file is required to be loaded.

download the jar file mysql-connector.jar

Two ways to load the jar file:

1) Paste the mysqlconnector.jar file in jre/lib/ext folder

2) Set classpath

Output : Login Screen

Output : Wrong Authentication - Login Screen

Output : Successfully - Login Screen