JAVA

package javafxloginwithdb;

import javafx.application.Application;
import javafx.stage.Stage;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javax.swing.*;

/**
 *
 * @author jubai
 */
public class MyClass extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        VBox root = new VBox();
        Text txt1 = new Text("Id");
        Text txt2 = new Text("First Name");
        Text txt3 = new Text("Last Name");
        Text txt4 = new Text("Age");
        TextField txf1 = new TextField();
        TextField txf2 = new TextField();
        TextField txf3 = new TextField();
        TextField txf4 = new TextField();

        Button add = new Button("Add");
        Button delete = new Button("Delete");
        Button update = new Button("Update");

        add.setOnAction(new EventHandler<javafx.event.ActionEvent>() {

            @Override
            public void handle(javafx.event.ActionEvent event) {
                try{
                    theQuery("insert into users (fname,lname,age) values('"+txf2.getText()+"','"+txf3.getText()+"',"+txf4.getText()+")");
                }
                catch(Exception ex){}

            }
        });

        delete.setOnAction(new EventHandler<javafx.event.ActionEvent>() {

            @Override
            public void handle(javafx.event.ActionEvent event) {
                try{

                    theQuery("delete from users where id = "+txf1.getText());
                }
                catch(Exception ex){}

            }
        });

        update.setOnAction(new EventHandler<javafx.event.ActionEvent>() {

            @Override
            public void handle(javafx.event.ActionEvent event) {
                try{

                    theQuery("update users set fname = '"+txf2.getText()+"',lname = '"+txf3.getText()+"', age = "+txf4.getText()+" where id = "+txf1.getText());
                }
                catch(Exception ex){}

            }
        });

        root.getChildren().addAll(txt1,txt2,txt3,txt4,txf1,txf2,txf3,txf4,add,delete,update);
        root.setAlignment(Pos.CENTER);
        root.setSpacing(20);

        Scene scene = new Scene(root, 200, 300);
        primaryStage.setMaxWidth(200);
        primaryStage.setMaxHeight(300);
        primaryStage.setTitle("Student_Info");
        primaryStage.setScene(scene);
        primaryStage.show();

    }







 //function to execute the insert update delete query
  public void theQuery(String query){
      Connection con = null;
      Statement st = null;
      try{
          con = DriverManager.getConnection("jdbc:mysql://localhost/test_db","root","");
          st = con.createStatement();
          st.executeUpdate(query);
          JOptionPane.showMessageDialog(null,"Query Executed");
      }catch(Exception ex){
          JOptionPane.showMessageDialog(null,ex.getMessage());
      }
  }


     public static void main(String[] args){

         new  MyClass();
     }

}