使用Sqlalchemy在多个外键上创建连接

from sqlalchemy import create_engine, Column, Integer, String, ForeignKey
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.ext.declarative import declarative_base

# 创建数据库引擎
engine = create_engine('数据库连接字符串')

# 创建会话工厂
Session = sessionmaker(bind=engine)
session = Session()

# 创建基类
Base = declarative_base()

# 定义表类
class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    posts = relationship('Post', back_populates='user')

class Post(Base):
    __tablename__ = 'posts'
    id = Column(Integer, primary_key=True)
    title = Column(String)
    user_id = Column(Integer, ForeignKey('users.id'))
    user = relationship('User', back_populates='posts')

# 创建表
Base.metadata.create_all(engine)

# 创建数据
user = User(name='John')
post = Post(title='Hello World', user=user)
session.add(user)
session.add(post)
session.commit()

# 查询数据
query = session.query(User, Post).join(Post)
result = query.all()

# 打印结果
for user, post in result:
    print(user.name, post.title)