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Overview

Reflex uses sqlmodel to provide a built-in ORM wrapping SQLAlchemy.

The examples on this page refer specifically to how Reflex uses various tools to expose an integrated database interface. Only basic use cases will be covered below, but you can refer to the sqlmodel tutorial for more examples and information, just replace SQLModel with rx.Model and Session(engine) with rx.session()

For advanced use cases, please see the SQLAlchemy docs (v1.4).

Reflex provides a built-in SQLite database for storing and retrieving data.

You can connect to your own SQL compatible database by modifying the rxconfig.py file with your database url.

config = rx.Config(
    app_name="my_app",
    db_url="sqlite:///reflex.db",
)

For more examples of database URLs that can be used, see the SQLAlchemy docs. Be sure to install the appropriate DBAPI driver for the database you intend to use.

To create a table make a class that inherits from rx.Model with and specify that it is a table.

class User(rx.Model, table=True):
    username: str
    email: str
    password: str

Reflex leverages alembic to manage database schema changes.

Before the database feature can be used in a new app you must call reflex db init to initialize alembic and create a migration script with the current schema.

After making changes to the schema, use reflex db makemigrations --message 'something changed' to generate a script in the alembic/versions directory that will update the database schema. It is recommended that scripts be inspected before applying them.

The reflex db migrate command is used to apply migration scripts to bring the database up to date. During app startup, if Reflex detects that the current database schema is not up to date, a warning will be displayed on the console.

To query the database you can create a rx.session() which handles opening and closing the database connection.

You can use normal SQLAlchemy queries to query the database.

with rx.session() as session:
    session.add(
        User(
            username="test",
            email="admin@reflex.dev",
            password="admin",
        )
    )
    session.commit()
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