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https://github.com/felixbuenemann/xlsxtream

Streaming & Fast XLSX Spreadsheet Writer for Ruby
https://github.com/felixbuenemann/xlsxtream

csv ruby streaming xlsx-spreadsheet

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Streaming & Fast XLSX Spreadsheet Writer for Ruby

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README 

        
# Xlsxtream



[![Gem Version](https://badge.fury.io/rb/xlsxtream.svg)](https://rubygems.org/gems/xlsxtream)

[![Build Status](https://travis-ci.org/felixbuenemann/xlsxtream.svg)](https://travis-ci.org/felixbuenemann/xlsxtream)



Xlsxtream is a streaming writer for XLSX spreadsheets. It supports multiple worksheets and optional string

deduplication via a shared string table (SST). Its purpose is to replace CSV for large exports, because using

CSV in Excel is very buggy and error prone. It's very efficient and can quickly write millions of rows with

low memory usage.



Xlsxtream does not support formatting, charts, comments and a myriad of

other [OOXML](https://en.wikipedia.org/wiki/Office_Open_XML) features. If you are looking for a

fully featured solution take a look at [caxslx](https://github.com/caxlsx/caxlsx).



Xlsxtream supports writing to files or IO-like objects, data is flushed as the ZIP compressor sees fit.



## Installation



Add this line to your application's Gemfile:



```ruby

gem 'xlsxtream'

```



And then execute:



    $ bundle



Or install it yourself as:



    $ gem install xlsxtream



## Usage



```ruby

# Creates a new workbook and closes it at the end of the block

Xlsxtream::Workbook.open('my_data.xlsx') do |xlsx|

  xlsx.write_worksheet 'Sheet1' do |sheet|

    # Boolean, Date, Time, DateTime and Numeric are properly mapped

    sheet << [true, Date.today, 'hello', 'world', 42, 3.14159265359, 42**13]

  end

end



io = StringIO.new

xlsx = Xlsxtream::Workbook.new(io)



# Number of columns doesn't have to match

xlsx.write_worksheet 'Sheet1' do |sheet|

  sheet << ['first', 'row']

  sheet << ['second', 'row', 'with', 'more colums']

end



# Write multiple worksheets with custom names

xlsx.write_worksheet 'AppendixSheet' do |sheet|

  sheet.add_row ['Timestamp', 'Comment']

  sheet.add_row [Time.now, 'Good times']

  sheet.add_row [Time.now, 'Time-machine']

end



# If you have highly repetitive data, you can enable Shared String Tables (SST)

# for the workbook or a single worksheet. The SST has to be kept in memory,

# so do not use it if you have a huge amount of rows or a little duplication

# of content across cells. A single SST is used for the whole workbook.

xlsx.write_worksheet(name: 'SheetWithSST', use_shared_strings: true) do |sheet|

  sheet << ['the', 'same', 'old', 'story']

  sheet << ['the', 'old', 'same', 'story']

  sheet << ['old', 'the', 'same', 'story']

end



# Strings in numeric or date/time format can be auto-detected and formatted

# appropriately. This is a convenient way to avoid an Excel-warning about

# "Number stored as text". Dates and times must be in the ISO-8601 format and

# numeric values must contain only numbers and an optional decimal separator.

# The strings true and false are detected as boolean values.

xlsx.write_worksheet(name: 'SheetWithAutoFormat', auto_format: true) do |sheet|

  # these two rows will be identical in the xlsx-output

  sheet << [true, 11.85, DateTime.parse('2050-01-01T12:00'), Date.parse('1984-01-01')]

  sheet << ['true', '11.85', '2050-01-01T12:00', '1984-01-01']

end



# You can also create worksheet without a block, using the `add_worksheet` method.

# It can be only used sequentially, so remember to manually close the worksheet

# when you are done (before opening a new one).

worksheet = xls.add_worksheet(name: 'SheetWithoutBlock')

worksheet << ['some', 'data']

worksheet.close



# Writes metadata and ZIP archive central directory

xlsx.close

# Close IO object

io.close



# Changing the default font from Calibri, 12pt, Swiss

Xlsxtream::Workbook.new(io, font: {

  name: 'Times New Roman',

  size: 10, # size in pt

  family: 'Roman' # Swiss, Modern, Script, Decorative

})



# Specifying column widths in pixels or characters; 3 column example;

# "pixel" widths appear to be *relative* to an assumed 11pt Calibri

# font, so if selecting a different font or size (see above), do not

# adjust widths to match. Calculate pixel widths for 11pt Calibri.

Xlsxtream::Workbook.new(io, columns: [

  { width_pixels: 33 },

  { width_chars: 7 },

  { width_chars: 24 }

])

# The :columns option can also be given to write_worksheet, so it's

# possible to have multiple worksheets with different column widths.

```



## Compatibility



The current version of Xlsxtream requires at least Ruby 2.1.0.



If you are using an older Ruby version you can use the following in your Gemfile:



```ruby

gem 'xlsxtream', '< 2'

```



* The last version with support for Ruby 1.9.1 is 1.2.0.

* The last version with support for Ruby 1.9.2 is 1.3.2.



## Upgrading



If you are upgrading from a version earlier than 2.x and are using the undocumented `:io_wrapper` option you need to update your code:



```ruby

# Pre 2.x code with :io_wrapper option

Xlsxtream::Workbook.new(io, io_wrapper: MyCustomIOWrapper)

# New code with IO wrapper instance

io_wrapper = MyCustomIOWrapper.new(io)

Xlsxtream::Workbook.new(io_wrapper)

```



Every IO-like object that responds to `:add_file` is treated as an IO wrapper.



## Development



After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.



To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).



## Contributing



Bug reports and pull requests are welcome on GitHub at https://github.com/felixbuenemann/xlsxtream.



## License



The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).