Retrieve Images from sqlite3 in kivy on Windows OS

What I want to achieve:

I'm working on a small APP that can stores images and videos on the 'on_disk' sqlite3 database.

I would like to:

1. Retrieve the images and videos without internet connection

What I have done:

I did some researches about retrieving images from sqlite in kivy. For example I came across this post Retrieve Image from sqlite3 database and directly display on kivy window. However, I tried the same thing, but I couldn't achieve my goal.

My Code example:

videoandsql.py

import kivy
from kivy.app import App
from kivy.uix.videoplayer import VideoPlayer
from kivy.uix.boxlayout import BoxLayout
import sqlite3 as lite, StringIO, sys

class VideoAndSql(BoxLayout):
    def __init__(self, *args, **kwargs):
        super(VideoAndSql, self).__init__(*args, **kwargs)

    def readImage():
        try:
            fin = open("image5.jpg", "rb")
            imag = fin.read()
            return(imag)

        except IOError, e:

            print "Error %d: %s" % (e.args[0],e.args[1])
            sys.exit(1)

        finally:

            if fin:
                fin.close()


    try:
        con = lite.connect('test.db')
        cur = con.cursor()
        data = readImage()
        binary = lite.Binary(data)
        cur.execute("INSERT INTO Images(Data) VALUES (?)", (binary,) )

        con.commit()    

    except lite.Error, e:

        if con:
            con.rollback()

        print "Error %s:" % e.args[0]
        sys.exit(1)

    finally:

        if con:
            con.close() 

    def writeImage(data):

        try:
            pic = open('picture.jpg','wb')
            pic.write(data)

        except IOError, e:    
            print "Error %d: %s" % (e.args[0], e.args[1])
            sys.exit(1)

        finally:

            if pic:
                pic.close()       


        try:
            con = lite.connect('test.db')

            cur = con.cursor()    
            cur.execute("SELECT Data FROM Images LIMIT 1")
            data = cur.fetchone()[0]
            return (data)

            writeImage(data)


        except lite.Error, e:

            print "Error %s:" % e.args[0]
            sys.exit(1)

        finally:

            if con:
                con.close()                 

     def videoTest(self, *args):
         return VideoPlayer(source ="mm.mp4")

class VideoAndSqlTest(App):
    def build(self):
        return VideoAndSql()

VideoAndSqlTest().run()

videoandsqltest.kv

<VideoAndSql>:

BoxLayout:
    spacing: 10
    orientation: "vertical"

    Label:
        text: "Sql and Video testing app"

    Image:
        source: root.writeImage()

    Button:
        text: "sql"


    Button:
        text: "video"
        #on_release: root.videoTest()

    VideoPlayer:
        source: "mm.mp4"

Observation:

I can copy the image from the sqlite3 database to a file on my system and view it using windows viewer but I can't display it on my kivy app.

Suggestions:

1. Is there a better way I could do this?

2. Is it possible to use any of the kivy's storages (json, dict store, redis db) to achieve what I want? If yes, Is it simplier? Can anyone give me a sample code please?

3. I'll appreciate any suggestion(s) and answer(s) that can help me to resolve this and get what I want to achieve.

Thanks in advance!