PostgreSQL - Connect with Python
Connect to your Public Cloud Databases for PostgreSQL using the Python programming language
Connect to your Public Cloud Databases for PostgreSQL using the Python programming language
Last updated 4th April, 2022
Public Cloud Databases allow you to focus on building and deploying cloud applications while OVHcloud takes care of the database infrastructure and maintenance in operational conditions.
This guide explains how to connect to a PostgreSQL database instance with one of the world's most famous programming language: Python.
You can find an example on the Github examples repository.
A PostgreSQL instance can be managed through multiple ways. One of the easiest, yet powerful, is to use a Command Line Interface (CLI), as shown in our guide : Connect to PostgreSQL with CLI.
Another way is to interact directly using a programming language, such as Python. Python is one of the major programming languages in the world, especially in the Data ecosystem.
In order to do so, we will need to set up our Python environment with PostgreSQL drivers, then configure our Public Cloud Databases for PostgreSQL instances to accept incoming connections, and finally code in Python to perform a few example actions.
To interact with your PostgreSQL instance using Python, your development environment needs to be configured with:
Please follow the official Psycopg - PostgreSQL database adapter for Pytho. to get the latest information.
Once your Python environment is set up and you begin executing a python --version in your command line interface (CLI), you should see information about the version as shown below :
laptop$ python3 --version
Python 3.9.7
In the same console, by typing a pip list check if psycopg2 is correctly installed :
laptop$ pip list
Package Version
---------------------- -------
cryptography 3.3.2
mysql-connector-python 8.0.27
pip 20.3.4
protobuf 3.19.3
psycopg2 2.8.6
pyOpenSSL 20.0.1
setuptools 52.0.0
six 1.16.0
wheel 0.34.2
(...)
We are now ready to learn how to connect to our PostgreSQL instance!
Psycopg is the most popular PostgreSQL database adapter for the Python programming language.
In your Python environment, let's try a connection.
import psycopg2
connection = psycopg2.connect("postgres://avnadmin:K93xxxxxxxxxxaBp@postgresql-57xxxxfc-o2xxxxb53.database.cloud.ovh.net:20184/defaultdb?sslmode=require")
cursor = connection.cursor()
cursor.execute("select * from pg_stat_ssl")
stat_ssl = cursor.fetchone()
print(stat_ssl)
After executing your Python code, result shown in the CLI should be like this :
(590567, True, 'TLSv1.3', 'TLS_AES_256_GCM_SHA384', 256, None, None, None)
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