Active Record Without Rails and PostgreSQL

a script for connect a database and copy a single table in two tables, copy and save with the .rb extension for execute with Ruby, for example "inicio2tablas.rb" and run in a command line

 cmonterrosa@dibd02:~$ ./inicio2tablas.rb mydatabase myhost  

#!/usr/bin/ruby -w

require 'rubygems'
require 'active_record'

#--------- Carlos Augusto Monterrosa Lopez / cmonterrosa@gmail.com

def usage
STDERR.puts "Uso:
#{File.basename $0} dbname host"
exit 1
end

usage if ARGV.size != 2
dbname = ARGV[0]
host = ARGV[1]

ActiveRecord::Base.establish_connection(
:adapter => 'postgresql',
:database => dbname,
:username => 'your-user',
:password => 'your-password',
:encoding => 'utf8',
:host => host )


#------ Declaramos las clases para mapear las tablas --------
class Inicio < ActiveRecord::Base
      set_table_name :inicio
end

class Palabra < ActiveRecord::Base
set_table_name :palabras
has_many :significados
end

class Significado < ActiveRecord::Base
set_table_name :significados
belongs_to :palabra
end


puts "Cargando palabras..."
@contador=0
@inicio= Inicio.find(:all)
@inicio.each do |inicio|
@palabra = Palabra.create(:palabra => inicio.palabra,
:abreviatura => inicio.abreviatura)
@contador+=1

#------------ Vinculamos los significados -------------
(1..12).each do |num|
next if inicio["significado#{num}"].nil? || inicio["significado#{num}"].empty?
@palabra.significados.create(:significado => inicio["significado#{num}"])
end
end
puts "Finalizo la carga de palabras.."
puts "Total: #{@contador}"

How to migrate MySQL backup to PostgreSQL

Hi, the first step is generate a dump with all data from your mysql database. for example. I am working in Ubuntu 8.04 Hardy Heron

cmonterrosa@dibd02:~$ mysqldump dbname > file.sql -u root -p

enter your password and mysqldump generate a file with the BD backup. then you have tu run the script to format this file.sql into postgresql valid format.

This script is available in:

http://pgfoundry.org/frs/download.php/1535/mysql2pgsql.perl

cmonterrosa@dibd02:~$ perl mysql2pgsql.perl file.sql file-pgsql.sql

where file-pgsql.sql is the file valid for introduce the schema and data into postgresql.Now we are going to restore the schema and the rows.

cmonterrosa@dibd02:~$ psql -h localhost -d diccionarios -U cmonterrosa -W 

where -h option is host, in this case is the localhost, -d is the database and -U is the owner of the database.

Comments with

Carlos Augusto Monterrosa Lopez
cmonterrosa@gmail.com / cmonterrosa@sef-chiapas.gob.mx

Error Please install the postgresql adapter: `gem install activerecord-postgresql-adapter

I'm installing postgresql adapter for Ruby on Rails 1.2.6 and I found this error for create a model, then I installed 2 files, I am working on Ubuntu 8.04 Hardy Heron, I only write:

sudo apt-get install libdbi-ruby1.8 libpgsql-ruby1.8 ruby1.8-dev

I can create a model and database migration.

comments at cmonterrosa at gmail.com