Ruby SQL to CSV exporter

ruby_sql_to_csv.rb

require "rubygems"
begin
  require 'sequel'
rescue LoadError
  puts "Please run gem install sequel"
  exit!
end

DB = Sequel.connect(:adapter => 'mysql2',
                    :host => '127.0.0.1',
                    :database => '???',
                    :user => '???',
                    :password => '???')

Dir['export/*.csv'].each { |f| File.delete(f); puts "deleted: #{f}" }

class CVSSQLExporter
  def initialize(filename, db, sql)
    @filename = File.join('export', filename)
    @db = db
    @sql = sql
  end
  
  def export()
    require 'csv'
    CSV.open(@filename, 'wb') do |csv|
      first = true
      @db[@sql].all.each do |row|
        csv << row.inject([]) { |r, n| r << n[0] } and first = false if first
        csv << row.inject([]) { |r, n| r << n[1] }
      end
    end
    puts "exported: #{@filename}"
  end #/def export
end

foo_sql = <<-SQL
  select *
  from bar as foo
SQL

CVSSQLExporter.new('foo.csv', DB, foo_sql).export

Thanks a ton.This is really useful