SQLAlchemy is a Python SQL toolkit and ORM that allows you to work directly with SQL, map data to classes for object relational mapping, and version databases with alembic. The core provides a flexible tool to work with databases using SQL. The ORM allows mapping database tables to domain objects and working with those objects. It uses a unit of work pattern to track object changes and flush those changes to the database in a transaction. Alembic can be used to version control a database schema.

1. SQLAlchemy
and also alembic

2. what is it

3. Core
ORM

4. Core

5. Flexible DB Tool
Core
so powerful

6. users = Table('users', metadata,
Column('id', Integer, Sequence('user_id_seq'),
primary_key=True),
Column('name', String(50))
)
ins = users.insert().values(name='jack')
Core Example

7. work directly with sql etc

8. ORM

9. Data Mapping to Classes
ORM
so declarative

10. class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(String)
ed_user = User(name='ed')
session.add(ed_user)
ORM Example

11. abstractions of database
tables in domain objects

12. some other things

13. Unit of Work
different from Active Record

14. user1 = User(name='user1')
user2 = User(name='user2')
session.add(user1)
session.add(user2)
session.commit()
Unit of Work Example

15. alembic
version your db, sort of