为SQLAlchemy类加载子查询作为列

from sqlalchemy import create_engine, select, func
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base

# 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()

# 创建基础模型类
Base = declarative_base()

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

# 创建子查询
subquery = session.query(User.name, func.count(User.id).label('count')).group_by(User.name).subquery()

# 加载子查询作为列
query = session.query(User.name, subquery.c.count)

# 执行查询
results = query.all()

# 输出结果
for name, count in results:
    print(f'{name}: {count}')