Question

我刚刚开始使用sqlalchemy orm。基本上，我是关注this tutorial的例子。虽然那里提供的代码工作正常，但我的代码以错误结束。

我有一个定义所有声明的脚本：

import sqlalchemy as sql
import sqlalchemy.ext.declarative as sqldcl
import sqlalchemy.orm as sqlmap

engine = sql.create_engine('postgresql://username@localhost/dbname')

Base = sqldcl.declarative_base(metadata=sql.MetaData(engine, schema='schemaname'))

class Creators(Base):
    __tablename__ = 'creators'
    id = sql.Column(sql.Integer, primary_key=True)
    entity1 = sql.Column(sql.Integer)
    entity2 = sql.Column(sql.Unicode())


class Organizations(Base):
    __tablename__ = 'organizations'
    id = sql.Column(sql.Integer, primary_key=True)
    fk_creators = sql.Column(sql.Integer, sql.ForeignKey('creators.id'))
    creators = sqlmap.relationship(Creators)
    entity4 = sql.Column(sql.Integer)
    entity5 = sql.Column(sql.Unicode())

Base.metadata.create_all(engine)

此脚本运行时没有错误。但是，如果我现在想用以下脚本将一些东西插入我的数据库......

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from sqlalchemy_declarative import Creators, Base, Organizations

engine = create_engine('postgresql://username@localhost/dbname')
Base.metadata.bind = engine

DBSession = sessionmaker(bind=engine)

session = DBSession()

new_creator = Creators(entity1='111')
session.add(new_creator)
session.commit()


new_organization = Organizations(entity4='111', entity5='Blabla', creators=new_creator)
session.add(new_organization)
session.commit()

...我收到以下错误：

from sqlalchemy_declarative import Creators, Base, Organizations
ImportError: cannot import name 'Creators'

我无法弄清楚我哪里出错了。我很感激任何帮助。提前谢谢。

Answer 1

糟糕。好。我知道了。它确实是一个路径/命名问题，我的代码没有任何问题。感谢@reptilicus让我走上正轨。

sqlalchemy：声明式基础如何导入自己的类

1 个答案: