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Retrieve Image and File stored as a BLOB from MySQL Table using Python

  • Difficulty Level : Hard
  • Last Updated : 25 Feb, 2021

Prerequisites: MySQL server should be installed

In this post, we will be talking about how we can store files like images, text files, and other file formats into a MySQL table from a python script. Sometimes, just like other information, we need to store images and files into our database and provide it the security equivalent to other data.

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In MySQL, we can use BLOB datatype to store the files. A BLOB is a binary large object that can hold a variable amount of data. We can represent the files in binary format and then store them in our database. The four BLOB types are TINYBLOB, BLOB, MEDIUMBLOB, and LONGBLOB. These differ only in the maximum length of the values they can hold.



We will use mysql-connect to use MySQL drivers in our python script. First, install the requirements:

python3 -m pip install mysql-connect-python

Next, create a database and a table as shown below:

CREATE DATABASE STUDENTDB;

USE STUDENTDB;

CREATE TABLE PROFILE ( ID BIGINT PRIMARY KEY, NAME VARCHAR(50) NOT NULL, PICTURE LONGBLOB NOT NULL );

We can see the database schema using:

DESC PROFILE;

Now, let’s add some data into the database:



Python3




# Import the required modules
import mysql.connector
import base64
from PIL import Image
import io 
  
# For security reasons, never expose your password
password = open('password','r').readline()
  
# Create a connection
mydb = mysql.connector.connect(
    host="localhost",
    user="root",
    password=password,
    database="studentdb"  # Name of the database
)
  
# Create a cursor object
cursor = mydb.cursor()
  
# Open a file in binary mode
file = open('image.png','rb').read()
  
# We must encode the file to get base64 string
file = base64.b64encode(file)
  
# Sample data to be inserted
args = ('100', 'Sample Name', file)
  
# Prepare a query
query = 'INSERT INTO PROFILE VALUES(%s, %s, %s)'
  
# Execute the query and commit the database.
cursor.execute(query,args)
mydb.commit()

Now moving back to our MySQL database, we can see the inserted row.

Retrieve the file:

We can make an SQL query to retrieve the image. The returned data will be in base64 format. So first we need to decode the data. We can transmit this data to the user or utilize it in other ways. In this post, we will simply show the image on the screen.

Python3




# Import the required modules
import mysql.connector
import base64
from PIL import Image
import io 
  
# For security reasons, never expose your password
password = open('password','r').readline()
  
# Create a connection
mydb = mysql.connector.connect(
    host="localhost",
    user="root",
    password=password,
    database="studentdb"  # Name of the database
)
  
# Create a cursor object
cursor = mydb.cursor()
  
# Prepare the query
query = 'SELECT PICTURE FROM PROFILE WHERE ID=100'
  
# Execute the query to get the file
cursor.execute(query)
  
data = cursor.fetchall()
  
# The returned data will be a list of list
image = data[0][0]
  
# Decode the string
binary_data = base64.b64decode(image)
  
# Convert the bytes into a PIL image
image = Image.open(io.BytesIO(binary_data))
  
# Display the image
image.show()

Output:




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