如何在SQLalchemy中按日期和时间检索数据库条目？

from datetime import datetime
from sqlalchemy import create_engine, Column, Integer, String, DateTime
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')
Session = sessionmaker(bind=engine)
session = Session()

# 创建模型类
Base = declarative_base()

class Item(Base):
    __tablename__ = 'items'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    created_at = Column(DateTime)

# 按日期和时间检索数据库条目
date = datetime(2022, 1, 1)
items = session.query(Item).filter(Item.created_at >= date).all()

# 打印检索结果
for item in items:
    print(item.name)

# 关闭数据库连接
session.close()