module Mysql2xxxx
  class XML
    include ExtraOutputs
    
    attr_reader :properties
    
    def initialize(options = {})
      @properties = Properties.new options
    end
    
    def client
      @client ||= Client.new properties
    end

    # this matches the xml generated by "mysql --xml"
    # i tried to use builder, but the String#to_xs nonsense got in the way
    def to_file(f)
      f.write %{<?xml version="1.0" encoding="utf-8" ?>}
      f.write %{<resultset statement="#{properties.execute.to_xs}" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">}
      client.select_each(properties.execute) do |hsh|
        f.write %{<row>}
        hsh.each do |k, v|
          f.write %{<field name="#{k.to_xs}"#{' xsi:nil="true"' if v.nil?}>#{v.to_s.to_xs}</field>}
        end
        f.write %{</row>}
      end
      f.write %{</resultset>}
      nil
    end
  end
end