How to add Image to MySql database using Servlet and JDBC

import java.sql.*;

public class MyConnection {

    public static Connection getConnection()
    {

        // As java.sql package classes
        // contains Checked Exceptions,
        // we have to surround it with
        // Try/Catch Block.
        try {

            // We have to register the
            // Driver class present in
            // com.mysql.jdbc package.
            DriverManager.registerDriver(
                new com.mysql.jdbc.Driver());

            // To get the connection,
            // 3 params need to be passed in
            // DriverManager.getConnection() method.

            Connection con
                = DriverManager.getConnection(
                    "jdbc:mysql:// localhost:3306/"
                        + "FileUploadDatabase",
                    "root", "root");

            /* 1. URL: "jdbc:mysql://", is the address 
                  "localhost: " is the local machine 
                  and "3306" is the port number 
                  and "FileUploadDatabase" is the name 
                  of the database.

               2. UserName: "root", which is set 
                  while creating a database server in
                  MySql Workbench.
               3. Password: "root"   
            */

            return con;
        }
        catch (SQLException e) {

            System.out.println(e.getMessage());
        }
        return null;
    }
}

// Java program to implement
// the servlet
package controllers;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet
    .ServletConfig;
import javax.servlet
    .ServletException;
import javax.servlet
    .annotation.MultipartConfig;
import javax.servlet
    .annotation.WebServlet;
import javax.servlet
    .http.HttpServlet;
import javax.servlet
    .http.HttpServletRequest;
import javax.servlet
    .http.HttpServletResponse;
import javax.servlet.http.Part;

import Dao.UploadFileDao;
import connection.copy.MyConnection;

// This is the annotation-based
// mapping URL to Servlet.
@WebServlet("/serv")

// This annotation defines the maximum
// file size which can be taken.
@MultipartConfig(maxFileSize = 16177215)

public class serv extends HttpServlet {

    // auto generated
    private static final long serialVersionUID = 1L;

    public serv()
    {
        super();
    }

    // This Method takes in All the information
    // required and is used to store in the
    // MySql Database.
    public int uploadFile(String firstName,
                          String lastName,
                          InputStream file)
    {
        String SQL
            = "INSERT INTO users "
              + "(first_name, last_name, "
              + "photo) values (?, ?, ?)";
        int row = 0;

        Connection connection
            = MyConnection.getConnection();

        PreparedStatement preparedStatement;
        try {
            preparedStatement
                = connection.prepareStatement(sql);

            preparedStatement
                .setString(1, firstName);

            preparedStatement
                .setString(2, lastName);

            if (file != null) {

                // Fetches the input stream
                // of the upload file for
                // the blob column
                preparedStatement.setBlob(3, file);
            }

            // Sends the statement to
            // the database server
            row = preparedStatement
                      .executeUpdate();
        }
        catch (SQLException e) {
            System.out.println(e.getMessage());
        }

        return row;
    }

    // As Submit button is hit from
    // the Web Page, request is made
    // to this Servlet and
    // doPost method is invoked.
    protected void doPost(
        HttpServletRequest request,
        HttpServletResponse response)
        throws ServletException, IOException
    {

        // Getting the parameters from web page
        String firstName
            = request.getParameter("firstName");

        String lastName
            = request.getParameter("lastName");

        // Input stream of the upload file
        InputStream inputStream = null;

        String message = null;

        // Obtains the upload file
        // part in this multipart request
        Part filePart
            = request.getPart("photo");

        if (filePart != null) {

            // Prints out some information
            // for debugging
            System.out.println(
                filePart.getName());
            System.out.println(
                filePart.getSize());
            System.out.println(
                filePart.getContentType());

            // Obtains input stream of the upload file
            inputStream
                = filePart.getInputStream();
        }

        // Sends the statement to the
        // database server
        int row
            = UploadFileDao
                  .uploadFile(firstName,
                              lastName,
                              inputStream);
        if (row > 0) {
            message
                = "File uploaded and "
                  + "saved into database";
        }
        System.out.println(message);
    }
}