SQLAlchemy如何检查加载的对象属性是否等于列default

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

# 创建数据库引擎和会话
engine = create_engine('数据库连接字符串')
Session = sessionmaker(bind=engine)
session = Session()

# 创建基类
Base = declarative_base()

# 定义模型类
class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String(50), default='John Doe')

# 检查加载的对象属性是否等于列的默认值
def check_default_value(obj):
    mapper = inspect(obj)
    for prop in mapper.attrs:
        if prop.loaded_value == prop.columns[0].default:
            print(f"{prop.key}属性的值等于列的默认值")

# 创建表格
Base.metadata.create_all(engine)

# 创建对象并保存到数据库
user = User()
session.add(user)
session.commit()

# 检查加载的对象属性是否等于列的默认值
check_default_value(user)