February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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105
レシピ 4.3 MongoDB とデータをやりとりする
まず、
Collection
インスタンスの生成を行います。コレクション（
Collection
）は
RDB
での
テーブルの概念に近く、テーブル内のすべてのデータフィールドをドキュメントというデータ単位
で保持しています。ドキュメント指向データベースでは、データを行単位でグルーピングする代わ
りに、ドキュメントと呼ばれるデータ単位を持っています。
RDB
におけるテーブルとレコードの
関係と同様に、
MongoDB
のドキュメントに内包されているデータフィールドは、
JavaScript
のオ
ブジェクトのように、それぞれキーと値を持っています。
コマンドラインの引数として
quote
と
author
の両方が与えられている場合は、
Collection
イン
スタンスの
insert
メソッドにオブジェクトを渡して、それをドキュメントとしてデータベースに
挿入します。
次に、
find
メソッド（
SQL
の
SELECT
文に相当）に取得したいキーと値を持ったオブジェクトを
渡して、データベースにクエリを送信します。その出力に対して、
mongodb
ドライバは
each
メソッ
ドを提供して、出力されたドキュメントごとに処理を行うことができます。
each
ですべてのドキュ
メントを処理した後、最後にドキュメントとして
null
が渡されます。このスクリプトでは、
doc
に
null
が渡された場合に
client.close
を実行し、データベース接続を解除します。
最後にもう一度
client.close ...
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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.