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I'm trying to add type hints to my SQLAlchemy script:
connection_string: str = "sqlite:///:memory:"
engine = create_engine(connection_string)
session = Session(bind=engine)
reveal_type(engine)
reveal_type(session)
I've ran this script against mypy but both types comes back as Any. What type should the engine and session variable be?
792
The Engine is the starting point for any SQLAlchemy application. It's “home base” for the actual database and its DBAPI, delivered to the SQLAlchemy application through a connection pool and a Dialect , which describes how to talk to a specific kind of database/DBAPI combination.
In the most general sense, the Session establishes all conversations with the database and represents a “holding zone” for all the objects which you've loaded or associated with it during its lifespan. It provides the interface where SELECT and other queries are made that will return and modify ORM-mapped objects.
delete() is invoked upon an object and the Session is flushed, the row is deleted from the database.
SQLAlchemy execute() return ResultProxy as Tuple, not dict.
Figured it out:
connection_string: str = "sqlite:///:memory:"
engine = create_engine(connection_string)
session = Session(bind=engine)
print(type(engine)) # sqlalchemy.engine.base.Engine
print(type(session)) # sqlalchemy.orm.session.Session
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