使用多条记录进行重复密钥更新的Python SQLAlchemy

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

# 创建模型类
Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String(50), unique=True)
    age = Column(Integer)

# 插入或更新记录
user = User(name='John', age=25)
session.merge(user)
session.commit()