Convert BSON file into SQL, useful for fast copy data from MongoDB to MySQL (mongodump => bson2sql => import to mysql)

bson2sql.rb

require "bson"

def make_insert(table_name, bson)
  columns = ["id",*bson["value"].keys] * ", "
  values = ["'#{bson["_id"]}'",*bson["value"].values.map{|value| value.is_a?(Numeric) ? value : "'#{value}'"}] * ", "
  return "insert into #{table_name} (#{columns}) values (#{values});"
end

file_name = ARGV.first
file=File.new(file_name)
table_name=File.basename(file_name,".*")
while not file.eof? do
  bson = BSON.read_bson_document(file)
  STDOUT << make_insert(table_name,bson)
  STDOUT << "\n"
end