[newbie]saving and reading array of associative array

ruby-talk
1

i’m looking for examples of saving to file and reading back an array of
associative array, in a ruby like way.

saying i have something like :

one = {“Name” => “Smith”, “Surname” => “John” …}
two = {“Name” => “Dupont”, “Surname” => “Jean” …}

myFriends = [one, two, …]

i want to save into a file “myFriends.db” the array of hashes myFriends
in such a way reading it back will recorver the array of hashes the
easiest way…

···

–
Yvon

2

i’m looking for examples of saving to file and reading back an array of
associative array, in a ruby like way.

saying i have something like :

one = {“Name” => “Smith”, “Surname” => “John” …}
two = {“Name” => “Dupont”, “Surname” => “Jean” …}

myFriends = [one, two, …]

i want to save into a file “myFriends.db” the array of hashes myFriends
in such a way reading it back will recorver the array of hashes the
easiest way…

···

il Wed, 17 Sep 2003 11:13:26 +0200, yvon.thoravallist@-SUPPRIMEZ-free.fr.invalid (Yvon Thoraval) ha scritto::

Marshal::dump
dump( anObject [, anIO] , limit=–1 ) → anIO

 Serializes anObject and all descendent objects. If anIO is
 specified, the serialized data will be written to it, otherwise

the
data will be returned as a String. If limit is specified, the
traversal of subobjects will be limited to that depth. If limit
is
negative, no checking of depth will be performed.

More easy than you think :wink:

BTW you could even use PStore, included in the standard lib, it works
similar to an hash, but gets saved on disk and supports ‘transactions’
for data integrity.

3

tanxs a lot !

···

gabriele renzi surrender_it@remove.yahoo.it wrote:

Marshal::dump
dump( anObject [, anIO] , limit=–1 ) → anIO

 Serializes anObject and all descendent objects. If anIO is
 specified, the serialized data will be written to it, otherwise

the
data will be returned as a String. If limit is specified, the
traversal of subobjects will be limited to that depth. If limit
is
negative, no checking of depth will be performed.

More easy than you think :wink:

BTW you could even use PStore, included in the standard lib, it works
similar to an hash, but gets saved on disk and supports ‘transactions’
for data integrity.

–
Yvon

4

You could also use YAML:

require ‘yaml’
one = {“Name” => “Smith”, “Surname” => “John”}
two = {“Name” => “Dupont”, “Surname” => “Jean”}

myFriends = [one, two]

File.open(“myfriends.db”, “w”) {|file| file.write(myFriends.to_yaml)}
myFriends = File.open(“myfriends.db”) {|file| YAML.load(file)}

···

On 9/17/2003 6:34 AM, gabriele renzi wrote:

Marshal::dump
dump( anObject [, anIO] , limit=–1 ) → anIO

BTW you could even use PStore, included in the standard lib, it works
similar to an hash, but gets saved on disk and supports ‘transactions’
for data integrity.

–
Dean saor, dean saor an spiorad. Is seinn d’orain beo.

5

fine, i should say i’ve other versions of what i plan to do in :

  • perlCocoa (CamelBones specific to MacOS X)
  • php + xml
  • php + mySQL
···

Joey Gibson joey@joeygibson.com wrote:

You could also use YAML:

require ‘yaml’
one = {“Name” => “Smith”, “Surname” => “John”}
two = {“Name” => “Dupont”, “Surname” => “Jean”}

myFriends = [one, two]

File.open(“myfriends.db”, “w”) {|file| file.write(myFriends.to_yaml)}
myFriends = File.open(“myfriends.db”) {|file| YAML.load(file)}

–
Yvon

6

Yes, I was just about to mention YAML. Also note that you can use
YAML::Store as a drop-in PStore replacement. (In fact, this example is
the example given in pstore.rb, I just require’d yaml/store, and changed
the db = line to YAML::Store)

~/prog/ruby$ cat yaml-store-example.rb
require ‘yaml/store’
db = YAML::Store.new(“/tmp/foo”)
db.transaction do
p db.roots
ary = db[“root”] = [1,2,3,4]
ary[0] = [1,1.5]
end

db.transaction do
p db[“root”]
end
~/prog/ruby$ ruby yaml-store-example.rb

[[1, 1.5], 2, 3, 4]
~/prog/ruby$ cat /tmp/foo

···

On Wed, 17 Sep 2003 21:22:13 +0900 Joey Gibson joey@joeygibson.com wrote:

On 9/17/2003 6:34 AM, gabriele renzi wrote:

Marshal::dump
dump( anObject [, anIO] , limit=–1 ) → anIO

BTW you could even use PStore, included in the standard lib, it works
similar to an hash, but gets saved on disk and supports ‘transactions’
for data integrity.

You could also use YAML:

require ‘yaml’
one = {“Name” => “Smith”, “Surname” => “John”}
two = {“Name” => “Dupont”, “Surname” => “Jean”}

myFriends = [one, two]

File.open(“myfriends.db”, “w”) {|file| file.write(myFriends.to_yaml)}
myFriends = File.open(“myfriends.db”) {|file| YAML.load(file)}

root:

- 1
- 1.5
  • 2
  • 3
  • 4
    ~/prog/ruby$

Jason Creighton