Book Image

Building Python Web APIs with FastAPI

By : Abdulazeez Abdulazeez Adeshina
Book Image

Building Python Web APIs with FastAPI

By: Abdulazeez Abdulazeez Adeshina

Overview of this book

RESTful web services are commonly used to create APIs for web-based applications owing to their light weight and high scalability. This book will show you how FastAPI, a high-performance web framework for building RESTful APIs in Python, allows you to build robust web APIs that are simple and intuitive and makes it easy to build quickly with very little boilerplate code. This book will help you set up a FastAPI application in no time and show you how to use FastAPI to build a REST API that receives and responds to user requests. You’ll go on to learn how to handle routing and authentication while working with databases in a FastAPI application. The book walks you through the four key areas: building and using routes for create, read, update, and delete (CRUD) operations; connecting the application to SQL and NoSQL databases; securing the application built; and deploying your application locally or to a cloud environment. By the end of this book, you’ll have developed a solid understanding of the FastAPI framework and be able to build and deploy robust REST APIs.
Table of Contents (14 chapters)
Part 1: An Introduction to FastAPI
Part 2: Building and Securing FastAPI Applications
Part 3: Testing And Deploying FastAPI Applications

Creating a database

In SQLModel, connecting to a database is done via a SQLAlchemy engine. The engine is created by the create_engine() method, imported from the SQLModel library.

The create_engine() method takes the database URL as the argument. The database URL is in the form of sqlite:///database.db or sqlite:///database.sqlite. It also takes an optional argument, echo, which when set to True prints out the SQL commands carried out when an operation is executed.

However, the create_engine() method alone isn’t sufficient to create a database file. To create the database file, the SQLModel.metadata.create_all(engine) method whose argument is an instance of the create_engine() method is invoked, such as the following:

database_file = "database.db"
engine = create_engine(database_file, echo=True)

The create_all() method creates the database as well as the tables defined. It is important to note that the file containing...