SQLAlchemy查询将id标记为空

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

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

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

# 创建基类
Base = declarative_base()

# 定义数据模型类
class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    
# 创建会话
session = Session()

# 查询将id标记为空的数据
result = session.query(User).filter(User.id == None).all()

# 打印查询结果
for user in result:
    print(user.id, user.name)