activerecord_idnamecache's Introduction

activerecord_idnamecache

Use Mysql AUTO_INCREMENT to support key value cache, which should be combined by an integer and string. It means to reduce the database storage size, and improve query performance.

All cache will store in process memory, and will never be expired, until the process dies, so the less kvs you use, the better performance you will get. BTW, 100,000 general strings use 10MB memory.

Some relatived articles: http://en.wikipedia.org/wiki/Correlation_database

Usage

setup

create_table :kv_browser_names, :options => 'ENGINE=MyISAM DEFAULT CHARSET=utf8' do |t|
  t.string :name
  t.timestamps
end

class KvBrowserName < ActiveRecord::Base
  include IdNameCache
end

create_table :common_tag, :options => 'ENGINE=MyISAM DEFAULT CHARSET=utf8' do |t|
  t.integer :tagid
  t.string  :tagname
end

class CommonTag < ActiveRecord::Base
  self.table_name = :common_tag
  self.primary_key = :tagid

  include IdNameCache; set_key_value :tagid, :tagname
  # include IdNameCache; set_key_value_without_create :tagid, :tagname # if you dont want create it automately
end

use cases

ruby-1.9.3-rc1 :001 > QuizTag[1]
  QuizTag Load (0.3ms)  SELECT `common_tag`.* FROM `common_tag` WHERE `common_tag`.`tagid` = 1 LIMIT 1
 => "Android"
ruby-1.9.3-rc1 :002 > QuizTag[1]
 => "Android"
ruby-1.9.3-rc1 :003 > QuizTag['Android']
  QuizTag Load (0.5ms)  SELECT `common_tag`.* FROM `common_tag` WHERE `common_tag`.`tagname` = 'Android' LIMIT 1
 => 1
ruby-1.9.3-rc1 :004 > QuizTag['Android']
 => 1

== Copyright MIT, David Chen at eoe.cn

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