package sample;

import javafx.scene.image.Image;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.sql.*;


public class MysqlConnect extends Image {
    /*
     * set the default variables for mysql connection
     * */
    private static final String url ="";

    private static final String user = "";

    private static final String password = "";

    public MysqlConnect(String s) {
        super(s);
    }



    public static BufferedImage main()
    {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(url, user, password);
            System.out.println("Success");

            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("select * from images");

            BufferedImage image = null;
            if (!rs.next()) {
                java.sql.Blob blob = rs.getBlob(2);
                InputStream in = blob.getBinaryStream();
                image = ImageIO.read(in);
            }


            con.close();
            System.out.println("reached here");
            return image;


        } catch (Exception e)
        {
            e.printStackTrace();
        }

        return null;
    }

}

import javafx.scene.image.ImageView;


public class Controller extends Main {

    private ImageView imageView;



    public void  SubmitButtonClicked(){System.out.println("it is Submitted ");}

    public void NextButtomClicked()
    {
        MysqlConnect image = new MysqlConnect("one");
        imageView.setImage(image);

    }

}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.Region?>
<?import javafx.scene.layout.VBox?>

<BorderPane prefHeight="576.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/9" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <bottom>
      <VBox prefHeight="98.0" prefWidth="600.0" BorderPane.alignment="CENTER">
         <children>
            <HBox prefHeight="159.0" prefWidth="648.0">
               <children>
                  <TextField promptText="Name:">
                     <HBox.margin>
                        <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
                     </HBox.margin>
                  </TextField>
                  <Region HBox.hgrow="ALWAYS" />
                  <Button mnemonicParsing="false" text="Decline">
                     <HBox.margin>
                        <Insets left="25.0" right="25.0" top="50.0" />
                     </HBox.margin>
                  </Button>
                  <Button layoutX="181.0" layoutY="10.0" mnemonicParsing="false" onAction="#SubmitButtonClicked" text="Submit">
                     <HBox.margin>
                        <Insets right="10.0" top="50.0" />
                     </HBox.margin>
                  </Button>
               </children>
            </HBox>
         </children>
      </VBox>
   </bottom>
   <left>
      <ImageView fx:id="imageView" fitHeight="341.0" fitWidth="284.0" pickOnBounds="true" preserveRatio="true" BorderPane.alignment="CENTER_RIGHT">
         <BorderPane.margin>
            <Insets bottom="20.0" left="20.0" right="20.0" top="8.0" />
         </BorderPane.margin>

      </ImageView>
   </left>
   <top>
      <HBox prefHeight="94.0" prefWidth="600.0" BorderPane.alignment="CENTER">
         <children>
            <Button mnemonicParsing="false" prefHeight="30.0" prefWidth="74.0" text="Previous">
               <HBox.margin>
                  <Insets left="10.0" right="10.0" top="8.0" />
               </HBox.margin>
            </Button>
            <Region prefHeight="166.0" prefWidth="144.0" />
            <Button mnemonicParsing="false" onAction="#NextButtomClicked" prefHeight="30.0" prefWidth="74.0" text="Next">
               <HBox.margin>
                  <Insets top="8.0" />
               </HBox.margin>
            </Button>
         </children>
      </HBox>
   </top>
</BorderPane>