a super simple pstore based key value store for minimal db-needs

store.rb

require 'pstore'

class Store
  def initialize(file, thread_safe = true)
    @store = PStore.new(file, thread_safe)
  end

  def crud(key=nil, val=nil)
    val ? @store.transaction{ @store[key] = val }
        : @store.transaction(false){ key ? @store[key] : Hash[@store.roots.map{|k| [k, @store[k]]}] }
  end
end

mydb = Store.new('db.pstore')

# save something to the store
mydb.crud(:foo, 'bar')

# read something from the store
mydb.crud(:foo) # 'bar'
mydb.crud(:xxx) # nil

# get the whole store as a Hash
mydb.store # {:foo => 'bar'}