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用巨蟒风暴制作ORM

storm-orm orm python

-1

anon · 技术社区 · 15 年前

这个问题是基于 the thread ,因为我观察到Storm允许我重用我的SQL模式。

如何解决暴风雪中的以下错误信息?

代码基于Jason的答案和Storm的手册。

import os, pg, sys, re, psycopg2, storm
from storm.locals import *
from storm import *

class Courses():
    subject = Unicode()

database = create_database("postgres://naa:123@localhost:5432/tk")
store = Store(database)

course = Courses()
course.subject = 'abcd'
store.add(course)

它给你

Traceback (most recent call last):                                            
  File "<stdin>", line 13, in <module>
  File "/usr/lib/python2.6/dist-packages/storm/store.py", line 245, in add
    obj_info = get_obj_info(obj)
  File "/usr/lib/python2.6/dist-packages/storm/info.py", line 40, in get_obj_info 
    obj_info = ObjectInfo(obj)
  File "/usr/lib/python2.6/dist-packages/storm/info.py", line 162, in __init__
    self.cls_info = get_cls_info(type(obj))
  File "/usr/lib/python2.6/dist-packages/storm/info.py", line 51, in get_cls_info
    cls.__storm_class_info__ = ClassInfo(cls)
  File "/usr/lib/python2.6/dist-packages/storm/info.py", line 69, in __init__
    raise ClassInfoError("%s.__storm_table__ missing" % repr(cls))
storm.exceptions.ClassInfoError: <type 'instance'>.__storm_table__ missing

这对我来说意味着某个模块丢失了。没有模块 instance 在风暴中。

1 回复 | 直到 12 年前

1

4

Jason Baker 15 年前

我会忽略连接细节,因为我对Postgres不太熟悉。

from storm.locals import *

class Courses(object):
    __storm_table__ = 'courses'
    pkey = Int(primary=True)
    course_nro = Unicode()

course = Courses()
course.course_nro = 'abcd'
store.add(course)
store.commit()

当然,如果要在一行上进行构造函数和初始化,可以使用 pysistence 的 expandos :

from storm.locals import *
from pysistence import Expando

class Courses(Expando):
    __storm_table__ = 'courses'
    pkey = Int(primary=True)
    course_nro = Unicode()

course = Courses(course_nro='abcd')
store.add(course)
store.commit()