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tbay.py
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tbay.py
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from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from datetime import datetime
from sqlalchemy import Column, Integer, String, DateTime, Float, ForeignKey
from sqlalchemy.orm import relationship
engine = create_engine('postgresql://BHarris:@localhost:5432/tbay')
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()
class Item(Base):
__tablename__ = 'items'
id = Column(Integer, primary_key=True)
name = Column(String, nullable=False)
description = Column(String)
start_time = Column(DateTime, default=datetime.utcnow)
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
username = Column(String, nullable=False)
password = Column(String, nullable=False)
class Bid(Base):
__tablename__ = 'bids'
id = Column(Integer, primary_key=True)
price = Column(Float, nullable=False)
item_id = Column(Integer, ForeignKey('items.id'), nullable=False)
item = relationship('Item', backref='bids')
user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
user = relationship('User', backref='bids')
Base.metadata.create_all(engine)
if __name__ == '__main__':
from tbay import session
from sqlalchemy import desc
beyonce = User(username='bknowles', password='123456')
christina = User(username='caguillera', password='qweasd')
britney = User(username='bspears', password='secret')
microphone = Item(name="microphone",
description="Mika's gold microphone.")
bids = [
Bid(price=500.0, user=christina, item=microphone),
Bid(price=1150.0, user=beyonce, item=microphone),
Bid(price=200.0, user=christina, item=microphone),
Bid(price=201.0, user=beyonce, item=microphone),
]
session.add_all([beyonce, christina, britney, microphone] + bids)
session.commit()
highest_bid = (session.query(Bid)
.filter(Bid.item==microphone)
.order_by(desc(Bid.price))
.first())
print(highest_bid.user.username)
print(highest_bid.item.description)