大家在 tornado 中，sqlalchemy 获取新闻及其分类是如何使用的？ - V2EX
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大家在 tornado 中，sqlalchemy 获取新闻及其分类是如何使用的？

  •   
  •   qloog Jun 24, 2014 5357 views
    This topic created in 4342 days ago, the information mentioned may be changed or developed.
    我的表结构大致是这样的：
    表news:
    news_id
    category_d
    title
    content
    create_time
    status

    --------
    表news_category:
    category_id
    category_name

    如果想实现 获取“新闻列表”的时候同时获取到category_name呢？ 通过循环category_id获取貌似太傻，好像sqlalchemy 建立model或者query时可以做到。

    但是用哪种方法更适合，或者有其他比较推荐的做法么？

    关于 sqlalchemy 貌似还不太会用~~， 请各位大神指导下吧！
    另外：这种建表方法应该没问题吧（还是说通过单独的关联表更好呢？）
  • SQLAlchemy
  • 获取
  • query
    4 replies    2014-07-25 14:27:02 +08:00
    messense
        1
    messense  
       Jun 24, 2014
    用 relationship 啊

    http://docs.sqlalchemy.org/en/latest/orm/relationships.html
    qloog
        2
    qloog  
    OP
       Jun 24, 2014
    @messense 主要是看不懂
    shajiquan
        3
    shajiquan  
       Jul 25, 2014
    class News(Base):
    category_id = Column(Integer, ForeignKey('news_category .category_id'))
    category = relationship("news_category")
    ..


    news = db_session.query(News).filter_by(id=5).first()

    分类名字：
    news.category.category_name
    shajiquan
        4
    shajiquan  
       Jul 25, 2014
    呃，我的缩进呢……
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