将哈希转换为 CSV



我有一个CSV,我喜欢在上面保存我所有的哈希值。我正在使用nokogiri sax来解析xml文档,然后将其保存到CSV。

萨克斯解析器:

require 'rubygems'
require 'nokogiri'
require 'csv'
class MyDocument < Nokogiri::XML::SAX::Document
  HEADERS = [ :titles, :identifier, :typeOfLevel, :typeOfResponsibleBody, 
              :type, :exact, :degree, :academic, :code, :text ]
  def initialize
     @infodata = {}
     @infodata[:titles] = Array.new([])
  end
  def start_element(name, attrs)
    @attrs = attrs
    @content = ''
  end
  def end_element(name)
    if name == 'title'
      Hash[@attrs]["xml:lang"]
      @infodata[:titles] << @content
      @content = nil
    end
    if name == 'identifier'
       @infodata[:identifier] = @content
       @content = nil
    end
    if name == 'typeOfLevel'
       @infodata[:typeOfLevel] = @content
       @content = nil
    end
    if name == 'typeOfResponsibleBody'
       @infodata[:typeOfResponsibleBody] = @content
       @content = nil
    end
    if name == 'type'
       @infodata[:type] = @content
       @content = nil
    end
    if name == 'exact'     
       @infodata[:exact] = @content
       @content = nil
    end
    if name == 'degree'
       @infodata[:degree] = @content
       @content = nil
    end
    if name == 'academic'
       @infodata[:academic] = @content
       @content = nil
    end
    if name == 'code'
       Hash[@attrs]['source="vhs"']
       @infodata[:code] = @content 
       @content = nil
    end
    if name == 'ct:text'
       @infodata[:beskrivning] = @content
       @content = nil
    end 
  end
  def characters(string)
    @content << string if @content
  end
  def cdata_block(string)
    characters(string)
  end
  def end_document
    File.open("infodata.csv", "ab") do |f|
      csv = CSV.generate_line(HEADERS.map {|h| @infodata[h] })
      csv << "n"
      f.write(csv)
    end
  end
end

为存储在文件夹中的每个文件(47.000xml 文件)创建新的对象:

parser = Nokogiri::XML::SAX::Parser.new(MyDocument.new)
counter = 0
Dir.glob('/Users/macbookpro/Desktop/sax/info_xml/*.xml') do |item|
  parser.parse(File.open(item, 'rb'))
  counter += 1
  puts "Writing file nr: #{counter}"
end

问题:我不会为每组新值获得新行。有什么想法吗?

3 个用于尝试代码的 XML 文件:https://gist.github.com/2378898https://gist.github.com/2378901https://gist.github.com/2378904

您需要使用"a"模式打开文件(使用"w"打开文件会清除任何以前的内容)。

将数组附加到 csv 对象将自动插入换行符。 哈希#值返回值的数组,但强制排序会更安全。 扁平化数组可能会导致列未对齐(例如 [[:title1, :title2], 'other-value'] 将导致 [:title1, :title2, 'other-value'])。 尝试这样的事情:

HEADERS = [:titles, :identifier, ...]
def end_document
  # with ruby 1.8.7
  File.open("infodata.csv", "ab") do |f|
    csv = CSV.generate_line(HEADERS.map { |h| @infodata[h] })
    csv << "n"
    f.write(csv)
  end
  # with ruby 1.9.x
  CSV.open("infodata.csv", "ab") do |csv|
    csv << HEADERS.map { |h| @infodata[h] }
  end
end

可以通过执行以下操作来验证上述更改:

require "csv"
class CsvAppender
  HEADERS = [ :titles, :identifier, :typeOfLevel, :typeOfResponsibleBody, :type,
              :exact, :degree, :academic, :code, :text ]
  def initialize
    @infodata = { :titles => ["t1", "t2"], :identifier => 0 }
  end
  def end_document
    @infodata[:identifier] += 1
    # with ruby 1.8.7
    File.open("infodata.csv", "ab") do |f|
      csv = CSV.generate_line(HEADERS.map { |h| @infodata[h] })
      csv << "n"
      f.write(csv)
    end
    # with ruby 1.9.x
    #CSV.open("infodata.csv", "ab") do |csv|
    #  csv << HEADERS.map { |h| @infodata[h] }
    #end
  end
end
appender = CsvAppender.new
3.times do
  appender.end_document
end
File.read("infodata.csv").split("n").each do |line|
  puts line
end

运行上述信息数据后.csv文件将包含:

"[""t1"", ""t2""]",1,,,,,,,,
"[""t1"", ""t2""]",2,,,,,,,,
"[""t1"", ""t2""]",3,,,,,,,,

我想你需要一个额外的循环。 类似于

CSV.open("infodata.csv", "wb") do |csv|    
  csv << @infodata.keys
  @infodata.each do |key, value|
    csv << value
  end
end

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