How To Connect and run SQL queries to a PostgreSQL database from Python
This article focus on connecting to a PostgreSQL database from Python.
- Install PostgreSQL, If you haven’t installed it.
- We need to install the psycopg2 library to connect to a PostgreSQL database. Open the command prompt and run the below command to install psycopg2
pip3 install psycopg2
Creating a Database
You can create a Database in 2 Ways:
- Using pgAdmin 4 UI
- Using command
1. Using pgAdmin 4 UI
Go to pgAdmin and Follow these Steps.
- Local_server[Right Click] -> Create -> Database
- Next, Fill out the form Database: WorkSpace and Save.
2. Create Database Using SQL query
Go to pgAdmin and follow these Steps:
Run the below Command in the Query tab
CREATE DATABASE WorkSpace;
Connecting to the database
We need to connect to a PostgreSQL database using psycopg2.connect() function.
Where the attributes of connect() function are:
host = hostname, dbname = databaseName, user = username, password = [Your Password], port = [port_id]
In case you don’t know any of these connect() function attributes, you can follow the below steps:
Now You Know All the properties of this Database. Let’s continue.
Now, to connect to the database, we need to pass the attributes as arguments to the connect() function.
conn = psycopg2.connect( host = 'localhost', dbname = 'For_Practice', user = 'postgres', password = '[Password]', port = 5432 )
Create a cursor:
- Create a cursor(i.e., curr) object and call its execute() method to execute queries.
- Where execute() method is used to run a query that is passed as a string.
cur = conn.cursor() cur.execute('[SQL queries]')
In the end, We need to save the changes using commit() method and finally close the opened connection using close() method.
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