Database Migrations in FastAPI
FastAPI is a modern, fast (high-performance), web framework for building APIs with Python based on standard Python type hints. It supports automatic generation of OpenAPI documentation and data validation. FastAPI is designed to be easy to use and to run efficiently on modern, asynchronous web servers such as Uvicorn or Hypercorn.
Autogenerated Migrations in FastAPI
FastAPI integrates seamlessly with SQLAlchemy for ORMs and database operations. FastAPI provides an easy way to create and apply database migrations using tools such as Alembic. When using FastAPI with an ORM such as SQLAlchemy, developers can make use of automatic migrations with Alembic to handle changes in database models.
Alembic Migrations
Alembic is a lightweight database migration tool for usage with the SQLAlchemy Database Toolkit for Python. It provides a way to create, manage, and apply database migrations for schema changes. In the context of FastAPI, Alembic can be used to generate and apply database migrations automatically based on changes in the database models.
How to Use Alembic Migrations in FastAPI
To use Alembic migrations in FastAPI, developers need to define database models using SQLAlchemy ORM. Then, developers can use Alembic to generate an initial migration script based on the database models. Subsequently, any changes to the database models can be detected and handled by Alembic, which can generate and apply the necessary migration scripts to update the database schema.
Conclusion
Database migrations in FastAPI using tools like Alembic provide a convenient way to manage changes to database schemas and models. With the ability to automatically generate and apply migrations based on changes in database models, developers can streamline the process of maintaining and evolving database structures while building APIs with FastAPI.
Sorry but where is here the migration with docker?
Thank you!
thanks
hello, i use sqlalchemy and alembic but it generates empty migration file.after if i use alembic upgrade head then its add that table into database.
Log:
2023-09-28 14:37:28,003 INFO sqlalchemy.engine.Engine BEGIN (implicit)
INFO [sqlalchemy.engine.Engine] BEGIN (implicit)
2023-09-28 14:37:28,003 INFO sqlalchemy.engine.Engine PRAGMA main.table_info("users")
INFO [sqlalchemy.engine.Engine] PRAGMA main.table_info("users")
2023-09-28 14:37:28,003 INFO sqlalchemy.engine.Engine [raw sql] ()
INFO [sqlalchemy.engine.Engine] [raw sql] ()
2023-09-28 14:37:28,004 INFO sqlalchemy.engine.Engine PRAGMA temp.table_info("users")
INFO [sqlalchemy.engine.Engine] PRAGMA temp.table_info("users")
2023-09-28 14:37:28,004 INFO sqlalchemy.engine.Engine [raw sql] ()
INFO [sqlalchemy.engine.Engine] [raw sql] ()
2023-09-28 14:37:28,005 INFO sqlalchemy.engine.Engine
CREATE TABLE users (
id INTEGER NOT NULL,
name VARCHAR(30),
email VARCHAR(50) NOT NULL,
password TEXT NOT NULL,
created_date DATETIME,
PRIMARY KEY (id),
UNIQUE (email)
)
INFO [sqlalchemy.engine.Engine]
CREATE TABLE users (
id INTEGER NOT NULL,
name VARCHAR(30),
email VARCHAR(50) NOT NULL,
password TEXT NOT NULL,
created_date DATETIME,
PRIMARY KEY (id),
UNIQUE (email)
)
2023-09-28 14:37:28,005 INFO sqlalchemy.engine.Engine [no key 0.00011s] ()
INFO [sqlalchemy.engine.Engine] [no key 0.00011s] ()
2023-09-28 14:37:28,016 INFO sqlalchemy.engine.Engine COMMIT
INFO [sqlalchemy.engine.Engine] COMMIT
INFO [alembic.runtime.migration] Context impl SQLiteImpl.
INFO [alembic.runtime.migration] Will assume non-transactional DDL.
Generating /home/demo/Documents/learning/flask – alembic +
sqlac/alembic/versions/516e9617afcd_added_initial_table.py … done
To the point and clear, Thank You!
thanks!
thanks a lot!