46-db-migration

46 - Database Migration Tool

What It Does

A SQLite database migration system that tracks schema versions and applies incremental up/down changes.

Run It

python migrate.py

Core Concepts

• sqlite3 module for database operations
• Schema version tracking
• SQL DDL for table creation/modification
• Up/down migration pattern
• Idempotent migration execution

What You Will Learn

You will learn database schema management and the migration pattern used by production ORMs.

Project Structure

46-db-migration/
  README.md
  migrate.py

Example Output

Database Migration Tool
-----------------------
Current version: 0
Available migrations: 3

Applying migration 001_create_users... OK
Applying migration 002_add_email_column... OK
Applying migration 003_create_posts... OK

Database is now at version 3.