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| import os
from sqlalchemy.orm import relationship, backref
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Table, Column, Integer, Numeric, String, DateTime, ForeignKey, Boolean, CheckConstraint
from datetime import datetime
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
dbname = os.path.basename(__file__).replace('.py', '.sqlite')
engine = create_engine('sqlite:///{}'.format(dbname), echo=True)
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()
class Cookie(Base):
__tablename__ = 'cookies'
__table_args__ = (CheckConstraint(
'quantity >= 0', name='quantity_positive'),)
cookie_id = Column(Integer, primary_key=True)
cookie_name = Column(String(50), index=True)
cookie_recipe_url = Column(String(255))
cookie_sku = Column(String(55))
quantity = Column(Integer())
unit_cost = Column(Numeric(12, 2))
def __init__(self, name, recipe_url=None, sku=None, quantity=0, unit_cost=0.00):
self.cookie_name = name
self.cookie_recipe_url = recipe_url
self.cookie_sku = sku
self.quantity = quantity
self.unit_cost = unit_cost
def __repr__(self):
return "Cookie(cookie_name='{self.cookie_name}', " \
"cookie_recipe_url='{self.cookie_recipe_url}', " \
"cookie_sku='{self.cookie_sku}', " \
"quantity={self.quantity}, " \
"unit_cost={self.unit_cost})".format(self=self)
class User(Base):
__tablename__ = 'users'
user_id = Column(Integer(), primary_key=True)
username = Column(String(15), nullable=False, unique=True)
email_address = Column(String(255), nullable=False)
phone = Column(String(20), nullable=False)
password = Column(String(25), nullable=False)
created_on = Column(DateTime(), default=datetime.now)
updated_on = Column(DateTime(), default=datetime.now,
onupdate=datetime.now)
def __init__(self, username, email_address, phone, password):
self.username = username
self.email_address = email_address
self.phone = phone
self.password = password
def __repr__(self):
return "User(username='{self.username}', " \
"email_address='{self.email_address}', " \
"phone='{self.phone}', " \
"password='{self.password}')".format(self=self)
class Order(Base):
__tablename__ = 'orders'
order_id = Column(Integer(), primary_key=True)
user_id = Column(Integer(), ForeignKey('users.user_id'))
shipped = Column(Boolean(), default=False)
user = relationship("User", backref=backref('orders', order_by=order_id))
def __repr__(self):
return "Order(user_id={self.user_id}, " \
"shipped={self.shipped})".format(self=self)
class LineItem(Base):
__tablename__ = 'line_items'
line_item_id = Column(Integer(), primary_key=True)
order_id = Column(Integer(), ForeignKey('orders.order_id'))
cookie_id = Column(Integer(), ForeignKey('cookies.cookie_id'))
quantity = Column(Integer())
extended_cost = Column(Numeric(12, 2))
order = relationship("Order", backref=backref(
'line_items', order_by=line_item_id))
cookie = relationship("Cookie", uselist=False)
def __repr__(self):
return "LineItems(order_id={self.order_id}, " \
"cookie_id={self.cookie_id}, " \
"quantity={self.quantity}, " \
"extended_cost={self.extended_cost})".format(
self=self)
Base.metadata.create_all(engine)
cookiemon = User('cookiemon', 'mon@cookie.com', '111-111-1111', 'password')
cc = Cookie('chocolate chip', 'http://some.aweso.me/cookie/recipe.html', 'CC01', 12, 0.50)
dcc = Cookie('dark chocolate chip',
'http://some.aweso.me/cookie/recipe_dark.html',
'CC02',
1,
0.75)
session.add(cookiemon)
session.add(cc)
session.add(dcc)
o1 = Order()
o1.user = cookiemon
session.add(o1)
line1 = LineItem(order=o1, cookie=cc, quantity=9, extended_cost=4.50)
session.add(line1)
session.commit()
o2 = Order()
o2.user = cookiemon
session.add(o2)
line1 = LineItem(order=o2, cookie=cc, quantity=2, extended_cost=1.50)
line2 = LineItem(order=o2, cookie=dcc, quantity=9, extended_cost=6.75)
session.add(line1)
session.add(line2)
session.commit()
|
