February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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119
レシピ 4.6 Cradle を使って CouchDB からデータを取得する
Cradle
は、このようなリクエストのショートカットを行う
db.view
関数を提供しています。本
スクリプトでは
outputQuotes
関数で使用しています。
db.view
は、
quotes/byAuthor
と
key
プロ
パティ（クエリ）を含むオブジェクトをパラメータに渡すことで、リクエストを作成して送信しま
す。
db.view
はレスポンスの
JSON
を受け取り、コールバック関数の
2
つ目のパラメータ（本レシピ
では
rowsArray
）に渡します。
forEach
ループを使って、それぞれの
author
と
quote
の値をコン
ソールに出力します。
forEach
ループに入る前に、
view
が存在しているかどうかを確認し、存在していなければ
createQuotesView
を実行して
view
を生成します。作成された
view
は
CouchDB
のデータベース
に保存され、いつでも呼び出すことができるため、アプリケーションを起動するたびに
view
を作
る必要はありません。
本レシピのプログラムは、次のチャートのように動作します。
データベースが存在する
checkAndSave()
authorとquote が
入力されている
outputQuotes()
author が
入力されている
byAuthor view が
存在する
データベースを
作成する
終了
outputQuotes()
author のすべての発言を
コンソールに出力する
No
Yes
No
Yes
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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.