SQLAlchemyand also alembic

what is it

Core

ORM

Core

Flexible DB Tool

Core

so powerful

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

work directly with sql etc

ORM

Data Mapping to Classes

ORM

so declarative

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

abstractions of database tables in domain objects

some other things

Unit of Work

different from Active Record

user1 = User(name='user1')user2 = User(name='user2')session.add(user1)session.add(user2)

session.commit()

Unit of Work Example

alembic

version your db, sort of