Python Application Connection to MySQL

by | Sep 1, 2021 | Blog | 0 comments

Python Application Connection to MySQL

MySQL is a highly popular open source database, used by developers all over the world. In this instruction we’ll show you how to connect your Python application, hosted within GPUonCLOUD Cloud, to this DB server.

  1. In our example, we have both Python and MySQL servers within a single environment. You can createsimilar one, use separate environments for your app server and database or work with any external instances.

2. Access your application server via GPUonCLOUD SSH Gate.

    

3. Now, install a MySQL connector for Python with the following command:

pip install mysql-connector==2.1.6

   

Note: In order to use the newer version of the MySQL connector, you need to additionally install Protobuf C++ of the 2.6.0 version or above.

4. Next, let’s create a simple script to establish connection. You can use any preferable text editor for this task, as well as any filename with the .py extension (e.g. vim script.py).

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import mysql.connector

from
mysql.connector import errorcode

try:

 cnx
= mysql.connector.connect(user='{user}', password='{password}',
host='{host}', database='{database}')

except
mysql.connector.Error as err:

 if err.errno
== errorcode.ER_ACCESS_DENIED_ERROR:

   print("Something
is wrong with your user name or password")

 elif
err.errno == errorcode.ER_BAD_DB_ERROR:

   print("Database
does not exist")

 else:

   print(err)

else:

 print("You
are connected!")

 cnx.close()

Here, you need to adjust the connection string (all the required information is provided within email for your MySQL node):

  • {user} – username to log into database with

  • {password} – password for the appropriate user

  • {host} – link to your MySQL container

  • {database} – database to be accessed (e.g. the default mysql one)

    

This script will connect to the specified database server with the provided credentials and will print connection errors (if any) or just a “You are connected!” phrase.

5. So, let’s execute our code with the appropriate command:

python script.py

If the “You are connected!” string appeared within terminal, the connection was successful. Now, you can be sure that you database server is accessible and can extend code to execute all of the required actions.

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