在python中基于其他表创建或填充表

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

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

# 创建基类
Base = declarative_base()

# 定义表的结构和字段
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)

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from your_module import User, Post

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

# 创建Session对象
Session = sessionmaker(bind=engine)
session = Session()

# 创建用户对象
user = User(name='John')

# 创建帖子对象
post1 = Post(title='Post 1', user=user)
post2 = Post(title='Post 2', user=user)

# 将对象添加到会话中
session.add(user)
session.add(post1)
session.add(post2)

# 提交会话
session.commit()