如何在Ruby中创建新的CSV文件？

问题描述

我有一个名为A.csv的CSV文件。我需要使用来自A.csv的数据生成一个名为B.csv的新CSV文件。

I have a CSV file called "A.csv". I need to generate a new CSV file called "B.csv" with data from "A.csv".

我将使用A. csv，并且必须在B.csv中将一列的值更新为新值。

I will be using a subset of columns from "A.csv" and will have to update one column's value to new value in "B.csv". Then I use this data from B.csv to validate at database.

1. 如何创建新的CSV文件？


2. 如何将所需列的数据从A.csv复制到B.csv？


3. 如何为特定列添加值？
   

1. How do I create a new CSV file?
2. How do I copy the required column's data from A.csv to "B.csv"?
3. How do I append values for a particular column?

我可以读取CSV，获取数组或散列。

I am able to read CSV, get an array, or hash.

推荐答案

正如mikeb指出的，有文档 - - 或者，您也可以按照下面的示例（所有的测试和工作）：

As mikeb pointed out, there are the docs - http://ruby-doc.org/stdlib-1.9.3/libdoc/csv/rdoc/CSV.html - Or you can follow along with the examples below (all are tested and working):

在这个文件中，我们将有两行，一个标题行和一个数据行，非常简单的CSV：

In this file we'll have two rows, a header row and data row, very simple CSV:

require "csv"
CSV.open("file.csv", "wb") do |csv|
  csv << ["animal", "count", "price"]
  csv << ["fox", "1", "$90.00"]
end

文件称为file.csv，具有以下内容：

result, a file called "file.csv" with the following:

animal,count,price
fox,1,$90.00

---

如何将数据附加到CSV

几乎相同的forumla，而不是使用wb模式，我们将使用a +模式。有关这些的详细信息，请参阅此堆栈溢出答案：

Of course this is like one of like a hundred different ways you can pull info from a CSV using this gem. For more info I suggest visiting the docs now that you have a primer: http://ruby-doc.org/stdlib-1.9.3/libdoc/csv/rdoc/CSV.html

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