February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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129
レシピ 4.8 Redis とデータをやりとりする
登録します。
client.sadd
は
Redis
の
SADD
コマンドのラッパーです。
SADD
コマンドは、キーを指
定されたセット型データ（順序のない配列）に配列要素を加えます。
次に、もし
author
が提供されている場合は、
client.smembers
メソッドを使って
SMEMBERS
コマ
ンドを発行します。
SMEMBERS
は、指定されたキーのセット型データに格納されているすべてのメ
ンバーデータを配列で返します。この場合、メンバーデータは
Quotes:01c59ee76aeafe
のような
名言
ID
の配列です。
forEach
ループを使って、この配列の各
ID
を
client.hgetall
メソッドに渡します。
HGETALL
は、渡したキーに対応するハッシュ型のデータを返すコマンドです。
client.hgetall
は、返され
たハッシュ値を
JavaScript
オブジェクトに変換してコールバック関数に渡します。ここで渡され
る名言オブジェクトには、
author
と
quote
にそれぞれ値が入っているので、それらをコンソール
に出力します。
すべての
Redis
コマンドを終えたら、
client.quit
を実行して
Redis
から切断します。
Redis
はスピードフリークのための夢のデータベースです。しかも、最適化の余地がまだまだ残
されています。これについてはミニレシピで見ていきます。
関連するレシピ
●
「レシピ
4.9
Redis
で
PubSub
を実装する」
ミニレシピ
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and much more.
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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.