SQLAlchemy 和 django，生产准备好了吗

### SQLAlchemy 和 Django：为生产环境做好准备

python
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
Base = declarative_base()
class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    username = Column(String)
    email = Column(String)
# 创建数据库引擎和会话
engine = create_engine('sqlite:///:memory:')
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()
# 添加用户
new_user = User(username='JohnDoe', email='john@example.com')
session.add(new_user)
session.commit()
# 查询用户
result = session.query(User).filter_by(username='JohnDoe').first()
print(result.username, result.email)

python
from django.db import models
class Person(models.Model):
    name = models.CharField(max_length=100)
    age = models.IntegerField()
    email = models.EmailField()