FastAPI + SQLAlchemy: Rapidly Building Database-Driven APIs

This article introduces how to build a database-driven API using FastAPI + SQLAlchemy, suitable for beginners. Its core advantages lie in FastAPI's high performance, automatic API documentation, and concise syntax, combined with SQLAlchemy's ORM to simplify database operations. Prerequisites include installing FastAPI, Uvicorn, SQLAlchemy, and Pydantic. The project adopts a modular structure: database.py configures database connections (using SQLite as an example), models.py defines ORM models for user tables, schemas.py uses Pydantic for data validation (distinguishing requests/responses), crud.py implements CRUD operations, and main.py integrates modules and defines API routes. Core modules include: database engine, session management (automatically creating/closing connections), user table models, data validation, and CRUD logic. The service is started via Uvicorn, and the Swagger UI enables interactive API testing. Advantages include automatic documentation, ORM simplification of SQL, modular design, and dependency injection for session management, making it suitable for quickly building efficient and maintainable web applications.