Joy of Think

Link: http://blog.aizatto.com/2007/05/21/activerecord-without-rails/

The basic idea is to using following method to connect database.

require "active_record"
ActiveRecord::Base.establish_connection(params)


The params must be a hash or object.

Based on this method, user can use yaml to load configure just like rails do:


dbconfig = YAML::load(File.open('database.yml'))
ActiveRecord::Base.establish_connection(dbconfig)


SQLite sample

development:
  adapter: sqlite3
  database: db/development.db
  pool: 5
  timeout: 5000

Migration


ActiveRecord::Migrator.up('db/migrate')
class CreateLogTables < ActiveRecord::Migration
def self.up
create_table :accounts do |t|
t.integer :account_id
end

end
end


Using ActiveRecord


class Account < ActiveRecord::Base
has_many :sessions
end

class Session < ActiveRecord::Base
belongs_to :user
has_many :actions
end

class Action < ActiveRecord::Base
belongs_to :session
end


Logger


ActiveRecord::Base.logger = Logger.new(File.open('log/database.log', 'a'))
ActiveRecord::Base.colorize_logging = false


Link: https://help.ubuntu.com/community/Kernel/Compile

Install package and source

sudo apt-get install fakeroot kernel-wedge build-essential makedumpfile kernel-package

Get source

sudo apt-get build-dep --no-install-recommends linux-image-$(uname -r)
apt-get source linux-image-$(uname -r)

Link: http://www.ruby-forum.com/topic/73148

Here is a very useful document about net::http performance. It introduces a idea that small buffer used in rbuf_fill causes interior performance of net/http. And he also introduce a workaround. The general idea is override the default behavior. Here are code:

class OverrideInternetMessageIO < Net::InternetMessageIO
  def rbuf_fill
    timeout(@read_timeout) {
      @rbuf << @socket.sysread(65536)
    }
  end
end

class NewHTTP < Net::HTTP
  def NewHTTP.socket_type
     OverrideInternetMessageIO
  end
end

Link: http://mulder.dummwiedeutsch.de/home/?page=guestbook

This is a great site containing free software for video playing, authoring and other utilities such as mplayer, avimux, DirectorySize etc.

Console2 is a great replacement for cmd. But it has problem to display chinese characters. The root case is that console assume that one character only occupy one column. Even it is true for english, but it is wrong for chinese. I patch a quick and dirty fix at least work for chinese character.

I attach win32 release version you can used to override original console. Please get from here http://blog.joyofthink.com/yangchen/media/blogs/a/console_chinese.zip

Link: http://stackoverflow.com/questions/825748/how-do-i-pass-command-line-arguments-to-a-rake-task

The most usable format is:
use ENV["name"] to access.
It supports "rake var_name=var_value"