sqlalchemy-repr 0.0.2

安装

pip install sqlalchemy-repr

用法

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy_repr import RepresentableBase

Base = declarative_base(cls=RepresentableBase)

例子

sqlalchemy_repr.RepresentableBase是 mixin 以添加列的简单表示。

>>> from datetime import datetime

>>> from sqlalchemy import Column, DateTime, Integer, Unicode, create_engine
>>> from sqlalchemy.ext.declarative import declarative_base
>>> from sqlalchemy.orm import sessionmaker
>>> from sqlalchemy_repr import RepresentableBase

>>> Base = declarative_base(cls=RepresentableBase)

>>> class User(Base):
...    __tablename__ = 'users'
...    id = Column(Integer, primary_key=True)
...    name = Column(Unicode(255), nullable=False, unique=True)
...    created = Column(DateTime, nullable=False)

>>> engine = create_engine('sqlite://')
>>> Base.metadata.create_all(engine)

>>> Session = sessionmaker(bind=engine)
>>> session = Session()

>>> user = User(name='spam', created=datetime(2016, 6, 1))
>>> session.add(user)
>>> session.commit()

>>> print(user)
<User id=1, name='spam', created='2016-06-01T00:00:00'>

sqlalchemy_repr.PrettyRepresentableBase带来了漂亮的缩进多行表示。

>>> from sqlalchemy_repr import PrettyRepresentableBase
>>> Base = declarative_base(cls=PrettyRepresentableBase)

>>> class User(Base):
...    __tablename__ = 'users'
...    id = Column(Integer, primary_key=True)
...    first_name = Column(Unicode(255), nullable=False, unique=True)
...    last_name = Column(Unicode(255), nullable=False, unique=True)
...    email = Column(Unicode(255), nullable=False)
...    created = Column(DateTime, nullable=False)
...    modified = Column(DateTime, nullable=False)

>>> engine = create_engine('sqlite://')
>>> Base.metadata.create_all(engine)

>>> Session = sessionmaker(bind=engine)
>>> session = Session()

>>> user = User(first_name='spam', last_name='ham',  email='spam@example.com', created=datetime(2016, 6, 1), modified=datetime(2016, 6, 1))
>>> session.add(user)
>>> session.commit()

>>> print(user)
<User
    id=1,
    first_name='spam',
    last_name='ham',
    email='spam@example.com',
    created='2016-06-01T00:00:00',
    modified='2016-06-01T00:00:00'>