4. Give Your Telegram Bot a Memory (Python + SQLite + SQLAlchemy)
If your Python Telegram bot forgets everything when it restarts, you need a database. In Level 4, we upgrade our bot from a temporary script to a stateful system using SQLite and SQLAlchemy (ORM). We will build a persistent shopping cart that survives server crashes!
⏮️ Previous (Level 3): • 3. Inline Keyboards & Callbacks in Telegra...
⏱️ Timestamps:
0:00 - The Problem: The Bot Forgets Everything
0:35 - Intro to Databases, SQLite & SQLAlchemy (ORM)
1:05 - Installing SQLAlchemy & Organizing Files
1:30 - Building the Database Model (CartItem)
2:20 - Engine, Sessions, and Creating Tables
3:05 - Saving Data on Button Click (db.add & db.commit)
4:10 - Retrieving Data (The /show_cart command)
4:50 - The Restart Test (Does the cart survive?)
5:15 - Top 3 Database Mistakes to Avoid
5:50 - Outro & Level 5 Teaser
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