Created
July 10, 2015 09:49
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CSV-Export DB from Ruby / PostgreSQL
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| # inspired by: https://github.com/oxon/logistaegvm/blob/master/lib/tasks/export.rake | |
| # required gems: | |
| # * pg | |
| # * rubyzip | |
| unless ARGV.count == 1 | |
| puts 'Required argument: Output directory' | |
| exit 1 | |
| end | |
| require 'pg' | |
| require 'zip' | |
| conn = PG.connect( host: 'localhost', dbname: '<dbname>' ) # TODO replace <dbname> - preferrably from ARGV | |
| directory = "#{ARGV[0]}/<subdir>" # TODO replace <subdir> | |
| FileUtils.mkdir_p(directory) | |
| output_file = "#{directory}/exported_#{Time.now.strftime('%Y-%m-%dT%H:%M:%S')}.zip" | |
| tables_query = "SELECT table_name FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE'" | |
| tables = conn.exec(tables_query).map{|table_row| table_row['table_name']} | |
| FileUtils.rm(output_file) if File.exists?(output_file) | |
| Zip::File.open(output_file, Zip::File::CREATE) do |zipfile| | |
| tables.each do |table| | |
| puts "exporting #{table}" | |
| filename = "#{directory}/#{table}.csv" | |
| FileUtils.rm(filename) if File.exists?(filename) | |
| conn.exec("copy #{table} to '#{filename}' delimiter ',' csv header") | |
| zipfile.add(filename.split('/').last, filename) | |
| end | |
| puts 'zipping output' | |
| end | |
| `rm #{directory}/*.csv` |
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