# flask-ext-sqlalchemy.pyfrom flask import Flask
from flask.ext.sqlalchemy import SQLAlchemyapp = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
db = SQLAlchemy(app)# 定义ORM
class User(db.Model):id = db.Column(db.Integer, primary_key=True)name = db.Column(db.String(80), unique=True)email = db.Column(db.String(120), unique=True)def __init__(self, name, email):self.name = nameself.email = emaildef __repr__(self):return '<User %r>' % self.name# 创建表格、插入数据
@app.before_first_request
def setup():# Recreate database each time for demo
    db.create_all()admin = User('admin', 'admin@example.com')db.session.add(admin)guestes = [User('guest1', 'guest1@example.com'),User('guest2', 'guest2@example.com'),User('guest3', 'guest3@example.com'),User('guest4', 'guest4@example.com')]db.session.add_all(guestes)db.session.commit()# 查询
@app.route('/user')
def users():users = User.query.all()return "<br>".join(["{0}: {1}".format(user.name, user.email) for user in users])# 查询
@app.route('/user/<int:id>')
def user(id):user = User.query.filter_by(id=id).one()return "{0}: {1}".format(user.name, user.email)# 运行
if __name__ == '__main__':app.run('127.0.0.1', 5000) 

# flask-pure-sqlalchemy.pyfrom flask import Flask
from sqlalchemy import Column, Integer, String
from sqlalchemy import create_engine
from sqlalchemy.orm import Session
from sqlalchemy.ext.declarative import declarative_baseapp =  Flask(__name__)Base = declarative_base()# 定义ORM
class User(Base):__tablename__ = 'users'id = Column(Integer, primary_key=True)name = Column(String(50), unique=True)email = Column(String(120), unique=True)def __init__(self, name=None, email=None):self.name = nameself.email = emaildef __repr__(self):return '<User %r>' % (self.name)# 创建表格、插入数据
@app.before_first_request
def setup():# Recreate database each time for demoengine = create_engine('sqlite://', echo=True)global sessionsession = Session(engine)Base.metadata.drop_all(bind=engine)Base.metadata.create_all(bind=engine)admin = User('admin', 'admin@example.com')session.add(admin)guestes = [User('guest1', 'guest1@example.com'),User('guest2', 'guest2@example.com'),User('guest3', 'guest3@example.com'),User('guest4', 'guest4@example.com')]session.add_all(guestes)session.commit()# 查询
@app.route('/user')
def users():users = session.query(User).all()return "<br>".join(["{0}: {1}".format(user.name, user.email) for user in users])@app.route('/user/<int:id>')
def user(id):user = session.query(User).filter(User.id == id).one()return "{0}: {1}".format(user.name, user.email)if __name__ == '__main__':app.run('127.0.0.1', 5000)