{"categories":["Python"],"published":"2019-12-06 11:53:31","height":"190","version":"1.0","blog_url":"https://aroundthedistance.hatenadiary.jp/","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Faroundthedistance.hatenadiary.jp%2Fentry%2F2019%2F12%2F06%2F115331\" title=\"SQLAlchemy\u306eLazyLoad\u3068EagerLoad - Life is Really Short, Have Your Life!!\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","description":"SQLAlchemy\u306b\u306f\u3001\u30ab\u30e9\u30e0\u3092\u6307\u5b9a\u3067\u304d\u308bwith_entities\u3068\u3044\u3046\u95a2\u6570\u304c\u3042\u308b\u3002\u3053\u3044\u3064\u3092\u6307\u5b9a\u3057\u3066\u30af\u30a8\u30ea\u3092\u7d44\u307f\u7acb\u3066\u308b\u3068\u304d\u306f\u3001join\u306b\u3088\u3063\u3066\u6307\u5b9a\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u4e2d\u8eab\u3092\u3001\u4e88\u3081\u3082\u3063\u3066\u304d\u3066\u304f\u308c\u308b\u3088\u3046\u3060\u3002Alchemy\u306eDebug=True\u3067\u78ba\u8a8d\u3057\u305f\u3002 db.session.query(Item).join(Category).with_entities( Item.id, Category.name ).all() \u3060\u3051\u3069\u3001\u3082\u3061\u308d\u3093backref\u306e\u6307\u5b9a\u306b\u3082\u3088\u308b\u3051\u308c\u3069\u3001\u30ab\u30e9\u30e0\u3092\u306a\uff5e\u3093\u306b\u3082\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u3001lazyload\u306b\u306a\u308b\u3002\u8a72\u5f53\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3055\u308c\u305f\u3068\u540c\u6642\u306b\u3001SQL\u304c\u8d70\u308b\u3002 rs = \u2026","blog_title":"Life is Really Short, Have Your Life!!","author_url":"https://blog.hatena.ne.jp/gothedistance/","provider_url":"https://hatena.blog","type":"rich","author_name":"gothedistance","image_url":null,"provider_name":"Hatena Blog","url":"https://aroundthedistance.hatenadiary.jp/entry/2019/12/06/115331","title":"SQLAlchemy\u306eLazyLoad\u3068EagerLoad"}