相关疑难解决方法(0)

是否有一种简单的方法来迭代列名和值对？

我的sqlalchemy版本是0.5.6

下面是我尝试使用dict(row)的示例代码,但它抛出异常,TypeError:'User'对象不可迭代

import sqlalchemy
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

print "sqlalchemy version:",sqlalchemy.__version__ 

engine = create_engine('sqlite:///:memory:', echo=False)
metadata = MetaData()
users_table = Table('users', metadata,
     Column('id', Integer, primary_key=True),
     Column('name', String),
)
metadata.create_all(engine) 

class User(declarative_base()):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    name = Column(String)

    def __init__(self, name):
        self.name = name

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

user1 = User("anurag")
session.add(user1)
session.commit()

# uncommenting next line throws exception 'TypeError: 'User' object is not iterable'
#print …

当我检查查询的结果时,它看起来像一个列表列表.我想返回一个dicts列表,将列名映射到结果值.如何将结果行转换为dicts？

results = db.session.query(
    PendingPost.campaign_id.label('campaign_id'),
    Campaign.title.label('title'),
    sqlalchemy.func.count(PendingPost.status).label('status_count'),
).join(
    Campaign, Campaign.id == PendingPost.campaign_id,
).join(
    Areas, Areas.id == PendingPost.area_id
).filter(
    sqlalchemy.func.month(PendingPost.creation_date) == datetime.datetime.utcnow().month
).group_by(
    PendingPost.status,
    PendingPost.campaign_id,
).all()

print(results)
[(3, 'campaign title', 1),
 (4, 'campaign title', 1)]