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我声明性地定义了以下表(非常简化的版本):

class Profile(Base):
        __tablename__ = 'profile'

        id = Column(Integer, primary_key = True)
        name = Column(String(65), nullable = False)

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


class Question(Base):
    __tablename__ = 'question'

    id = Column(Integer, primary_key = True)
    description = Column(String(255), nullable = False)
    number = Column(Integer, nullable = False, unique = True)


    def __init__(self, description, number):
        self.description = description
        self.number = number



class Answer(Base):
    __tablename__ = 'answer'

    profile_id = Column(Integer, ForeignKey('profile.id'), primary_key = True)
    question_id = Column(Integer, ForeignKey('question.id'), primary_key = True)
    value …