PostgreSQL API for Python allows user to interact with the PostgreSQL database using the psycopg2 module. In this article we will look into the process of connecting to a PostgreSQL database using Python.
First we will need to install the psycopg2 module with the below command in the command prompt:
pip install psycopg2
Creating a Database:
For the purpose of example we will be needing a sample database. To create so, follow the below steps:
- First open a PostgreSQL client tool like pgadmin4 or psql.
- Second login to the database using your credentials.
- Finally use the below command to create a database (say, School)
CREATE DATABASE school;
Connecting to the database:
To connect to the above created database (ie, school), we use the connect () function. The connect() function is used to create a new database session and it returns a new connection class instance.
To do so use the below syntax:
Syntax: conn = psycopg2.connect("dbname=suppliers user=postgres password=postgres")
To make it convenient to use you can use the below method:
1. First create a database.ini file with the credentials as shown below:
[postgresql] host=localhost database=school user=postgres password=5555
Now, the following config() function reads the database.ini file and returns connection parameters. The same config() function is added in the config.py file:
The following connect() function connects to the school database that we created earlier and returns the PostgreSQL database version.
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