From: Ara.T.Howard@...
Date: 2004-09-21T04:25:04+09:00
Subject: Re: Store object in on disk / mini database

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On Mon, 20 Sep 2004, [ISO-8859-1] Kristian S=F8rensen wrote:

> Hi!
>
> Is there some way of writing e.g. a hash table to the filesystem, and rea=
d
> it again? - Without having to parse in and output (and create the table a=
ll
> over).
>
> I need to store some information, which could be storred in a small datab=
ase
> (like sqlite - but I can't get ruby-sqlite installed proporly, if sqlite =
is
> not installed in the default location). Is there an interface to the Berk=
ley
> DB (www.sleepycat.com)?
>
>
> Best regards,
> Kristian S=F8rensen.

yes.  yes.


   jib:~ > cat a.rb
   require 'pstore'

   db =3D PStore::new 'db'

   this_time =3D Time::now
   last_time =3D nil

   db.transaction do
     if db.root? 'time'
       last_time =3D db['time']
     end
     db['time'] =3D this_time
   end


   puts "this_time <#{ this_time }>"
   puts "last_time <#{ last_time }>"

   jib:~ > ruby a.rb
   this_time <Mon Sep 20 13:05:29 MDT 2004>
   last_time <>

   jib:~ > ruby a.rb
   this_time <Mon Sep 20 13:05:33 MDT 2004>
   last_time <Mon Sep 20 13:05:29 MDT 2004>

   jib:~ > ruby a.rb
   this_time <Mon Sep 20 13:05:38 MDT 2004>
   last_time <Mon Sep 20 13:05:33 MDT 2004>



   jib:~ > cat b.rb
   require 'bdb'

   db =3D BDB::Btree.open "bdb", nil, BDB::CREATE, 0644

   this_time =3D Time::now
   last_time =3D nil

   last_time =3D db['time']
   db['time'] =3D this_time

   puts "this_time <#{ this_time }>"
   puts "last_time <#{ last_time }>"

   db.close

   jib:~ > ruby b.rb
   this_time <Mon Sep 20 13:10:55 MDT 2004>
   last_time <>

   jib:~ > ruby b.rb
   this_time <Mon Sep 20 13:10:56 MDT 2004>
   last_time <Mon Sep 20 13:10:55 MDT 2004>

   jib:~ > ruby b.rb
   this_time <Mon Sep 20 13:11:01 MDT 2004>
   last_time <Mon Sep 20 13:10:56 MDT 2004>


regards.

-a
--
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| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| A flower falls, even though we love it;
| and a weed grows, even though we do not love it.=20
|   --Dogen
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