{"author_name":"otao","image_url":null,"provider_url":"https://hatena.blog","version":"1.0","author_url":"https://blog.hatena.ne.jp/otao/","blog_url":"https://otao.hatenadiary.org/","categories":["Tech","Ruby","DB"],"description":"\u30b9\u30ad\u30fc\u30de\u306e\u5909\u66f4\u5206\u3092\u5225\u30e1\u30bd\u30c3\u30c9\u306b\u66f8\u3044\u3066\u3001\u30d3\u30eb\u30c9(rake)\u3067upgrade/downgrade\u304c\u3067\u304d\u308b\u3001\u3063\u3066\u3053\u3068\u3089\u3057\u3044\u3002 http://www.atmarkit.co.jp/im/carc/serial/proto04/proto04.html","provider_name":"Hatena Blog","width":"100%","blog_title":"\u5fd8\u5099\u93321.0","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fotao.hatenadiary.org%2Fentry%2F20060308%2F1141778540\" title=\"  \u30d7\u30ed\u30c8\u30bf\u30a4\u30d4\u30f3\u30b0\u306b\u52b9\u304fRoR\u306eDB\u79fb\u884c\u30fb\u5909\u63db\u6a5f\u80fd\u3000@IT - \u5fd8\u5099\u93321.0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://otao.hatenadiary.org/entry/20060308/1141778540","title":"  \u30d7\u30ed\u30c8\u30bf\u30a4\u30d4\u30f3\u30b0\u306b\u52b9\u304fRoR\u306eDB\u79fb\u884c\u30fb\u5909\u63db\u6a5f\u80fd\u3000@IT","height":"190","published":"2006-03-08 09:42:20"}