将sqlalchemy行对象转换为python di

Question

有没有一种简单的方法来遍历列名和值对？

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iterable

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 dict(user1)
# this one also throws 'TypeError: 'User' object is not iterable'
for u in session.query(User).all():
    print dict(u)

在系统输出上运行此代码：

sqlalchemy version: 0.5.6
Traceback (most recent call last):
  File "untitled-1.py", line 37, in <module>
    print dict(u)
TypeError: 'User' object is not iterable

Answer 1

根据@zzzeek的评论：

note that this is the correct answer for modern versions of SQLAlchemy, assuming "row" is a core row object, not an ORM-mapped instance.

for row in resultproxy:
    row_as_dict = dict(row)

Answer 2

您可以访问SQLAlchemy对象的内部__dict__，如下所示：

for u in session.query(User).all():
    print u.__dict__

Answer 3

我找不到一个好答案，所以我用这个：

def row2dict(row):
    d = {}
    for column in row.__table__.columns:
        d[column.name] = str(getattr(row, column.name))

    return d

编辑：如果上面的函数太长，不适合某些口味，这里有一个一行程序（Python2.7+）

row2dict = lambda r: {c.name: str(getattr(r, c.name)) for c in r.__table__.columns}