过滤SqlAlchemy中的Where子句

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

# 创建数据库引擎和会话
engine = create_engine('数据库连接字符串')
Session = sessionmaker(bind=engine)
session = Session()

# 定义映射类
Base = declarative_base()

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

# 创建数据表
Base.metadata.create_all(engine)

# 添加数据
user1 = User(name='张三', age=25)
user2 = User(name='李四', age=30)
session.add(user1)
session.add(user2)
session.commit()

# 查询年龄大于等于30的用户
users = session.query(User).filter(User.age >= 30).all()

# 输出查询结果
for user in users:
    print(user.name)

# 关闭会话
session.close()