CRUD Operations on Postgres using Async Database In Python

CRUD Operations on Postgres using Async Database In Python

To perform CRUD (Create, Read, Update, Delete) operations on a PostgreSQL database asynchronously in Python, you can use the asyncpg library, which is a fast, database interface library designed specifically for use with PostgreSQL and Python/asyncio.

First, you'll need to install asyncpg using pip:

pip install asyncpg

Here is a brief example that demonstrates how to perform CRUD operations with asyncpg:

Establishing a Connection

import asyncpg import asyncio async def create_connection(): conn = await asyncpg.connect(user='your_username', password='your_password', database='your_dbname', host='127.0.0.1') return conn # Later in the async loop # conn = await create_connection()

Create (Insert)

async def create_table(conn): await conn.execute(''' CREATE TABLE IF NOT EXISTS users( id serial PRIMARY KEY, name text, age int ) ''') async def insert_user(conn, name, age): await conn.execute(''' INSERT INTO users(name, age) VALUES($1, $2) ''', name, age) # Later in the async loop # await create_table(conn) # await insert_user(conn, 'John Doe', 30)

Read (Select)

async def select_users(conn): rows = await conn.fetch('SELECT * FROM users') for row in rows: print(row) # Later in the async loop # await select_users(conn)

Update

async def update_user(conn, user_id, age): await conn.execute(''' UPDATE users SET age=$1 WHERE id=$2 ''', age, user_id) # Later in the async loop # await update_user(conn, 1, 31)

Delete

async def delete_user(conn, user_id): await conn.execute(''' DELETE FROM users WHERE id=$1 ''', user_id) # Later in the async loop # await delete_user(conn, 1)

Main Async Loop

async def main(): # Connect to the database conn = await create_connection() # Create a table await create_table(conn) # Insert a new record await insert_user(conn, 'Jane Doe', 25) # Read all records await select_users(conn) # Update a record await update_user(conn, 1, 26) # Delete a record await delete_user(conn, 1) # Close the connection await conn.close() # Running the main coroutine loop = asyncio.get_event_loop() loop.run_until_complete(main())

Remember to replace your_username, your_password, your_dbname, and other placeholders with your actual PostgreSQL credentials and table information.

This is a simple demonstration. In a production environment, you would handle exceptions, use a connection pool, manage transactions, and properly organize your code with reusable functions or classes.

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