Ruby CSV.each用法及代碼示例

each → enumerator

each {|row| ...}

用每個連續的行調用塊。必須打開數據源才能讀取。

沒有標題：

string = "foo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string)
csv.each do |row|
  p row
end

輸出：

["foo", "0"]
["bar", "1"]
["baz", "2"]

帶標題：

string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string, headers: true)
csv.each do |row|
  p row
end

輸出：

<CSV::Row "Name":"foo" "Value":"0">
<CSV::Row "Name":"bar" "Value":"1">
<CSV::Row "Name":"baz" "Value":"2">

如果源未打開以供閱讀，則引發異常：

string = "foo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string)
csv.close
# Raises IOError (not opened for reading)
csv.each do |row|
  p row
end