sqlalchemy在where子句中动态使用and_

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

# 创建数据库引擎
engine = create_engine('mysql+mysqlconnector://username:password@localhost/database')

# 创建会话工厂
Session = sessionmaker(bind=engine)

# 创建会话
session = Session()

# 定义数据表映射类
Base = declarative_base()

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

# 动态构建查询条件
conditions = []
conditions.append(User.name == 'Alice')
conditions.append(User.age > 18)

# 构建WHERE子句
where_clause = and_(*conditions)

# 执行查询
query = session.query(User).filter(where_clause)
result = query.all()

# 处理查询结果
for user in result:
    print(user.name, user.age)