What is SQLAlchemy ORM and how do I use it?

What is SQLAlchemy ORM and how do I use it?

SQLAlchemy ORM is a powerful Object Relational Mapper for Python that allows you to interact with databases using Python objects.

Can you give me an example of how to define a model?

Sure! You can define a model by creating a class that inherits from Base. For example:

from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)

How do I create a session to interact with the database?

You can create a session using the sessionmaker function. Here's an example:

from sqlalchemy.orm import sessionmaker
Session = sessionmaker(bind=engine)
session = Session()

What if I want to query the database?

You can query the database using the session object. For example:

users = session.query(User).filter_by(name='John').all()