February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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113
レシピ 4.5 Cradle を使って CouchDB にデータを格納する
mongoskin
の
bind
メソッドは、複雑なデータベース操作を抽象化して、ドット記法で簡単に操
作できるように記述することを可能にします。
bind
の設定オブジェクトに記述した
store
メソッドの
if
文では、（
author
が存在するかどうかを
チェックせずに）
quote
が存在するかどうかのみをチェックしています。コマンドライン引数の順序
から、
quote
が存在する場合は必ず
author
が存在するからです。
例えば POST リクエストのデータを受け取るときなどにはこの方法はとれないため、以前のレシピ
では
author
と
quote
の両方をチェックするように記述しています。
以下のコマンドで出力を確認してください。
% node quotes_bind.js "
" "Perl
RSA
"
% node quotes_bind.js "
"
レシピ
4.5
Cradle
を使って
CouchDB
にデータを格納する
MongoDB
はスピードを優先しているため、
ACID
（
Atomicity, Consistency, Isolation,
Durability
）準拠のトランザクションはサポートしていません。これは、急な電源喪失など万一の
場合、（とても小さい確率ではありますが）データが壊れてしまう可能性が存在するということで
す。
CouchDB
は
ACID
に準拠しており、レプリケーションを設定し複数ホスト間で同期されている ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.