February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
94
4 章 データベース接続
write_to_csv.js
var writer = csv.createCsvFileWriter ('custom_data.csv', {
'separator': ':',
'quote': '|',
'escape': '\\' //
1
})
2
つ目のパラメータに渡している設定オブジェクトの
separator
プロパティはデータの区切り文
字を指定し（デフォルトはカンマ）、
quote
プロパティはデータを囲む引用文字を指定します（デ
フォルトはダブルクォート）。
escape
プロパティは、
quote
プロパティの値に指定された文字が
データフィールド内にある場合に、データフィールドを誤って閉じてしまわないようエスケープを
行う文字です。
例として、
quote
文字に設定されたパイプ（
|
）を以下のようにデータに混入しました。
var data = [['a','b','c','d','e|','f','g'],['h','i','j','k','l','m','n']];
これを実行すると、
custom_data.csv
に以下のように出力されます。
|a|:|b|:|c|:|d|:|e\||:|f|:|g|
|h|:|i|:|j|:|k|:|l|:|m|:|n|
データに含まれている
|
が
\
でエスケープされていることがわかります。
ミニレシピ
4.1.2
CSV
ファイルを読み込む
ya-csv
を使って
CSV
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.