require 'symbol_info'
require 'pstore'

db = PStore.new('symbol_info.pstore')

symbol_info = SymbolInfo.new('MSFT')
db.transaction do
  db['MSFT'] = SymbolInfo.new('MSFT')
  db['GOOG'] = SymbolInfo.new('GOOG')
end

db.transaction do
  p db['MSFT'].previous_closing_price
  p db['GOOG'].previous_closing_price
end