sqlAlchemy中的Sum字段

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

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

# 创建会话
Session = sessionmaker(bind=engine)
session = Session()

# 创建模型基类
Base = declarative_base()

# 创建模型类
class MyModel(Base):
    __tablename__ = 'my_table'
    id = Column(Integer, primary_key=True)
    value = Column(Integer)

# 查询字段value的总和
result = session.query(func.sum(MyModel.value)).scalar()

print(result)