PROSAGA码农传奇-ONOS/AWS Lambda/Kappa-Pylons + SQLA：一对一的关系

Pylons + SQLA：一对一的关系

作者: Coolkid
发布时间: 2025-03-26 02:29:10 (13天前)
转自：

<div class =“post-text”itemprop =“text”>
  <P>
    这有意义吗？
  </p>
   <pre>
    <code>
      class Entity(Base):
    __tablename__ = "entities"
    # Primary Key
    entity_id   = Column(Integer, primary_key=True)
    # Data Fields
    name        =  Column(Unicode(255), nullable=False)

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

def __unicode__(self):
        return self.name
    __str__ = __unicode__

class Client(Base):
    __tablename__ = "clients"
    client_id   = Column(Integer, primary_key=True)
    name        = Column(UnicodeText())
    entity_id   = Column(Integer, ForeignKey('entities.entity_id'))
    # Mapper
    entity = relation('Entity', uselist=False, backref='clients')

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

def __unicode__(self):
        return self.name
    __str__ = __unicode__

client_name="ClientName"
entitiy_name="EntityName"

client = Client(name=client_name)
client.entity=Entity(name=entitiy_name, description=entitiy_name + " added")

</code>
  </pre>
  <P>
    我觉得
    <a href="http://www.sqlalchemy.org/docs/orm/relationships.html#one-to-one" rel="nofollow">
      “uselist =假”
    </A>
     如果您使用OneToOne，则非常有用。
  </p>
</DIV>