Ruby on Rails框架程序连接MongoDB的教程

rails new todo -O

gem"mongo_mapper"

bundle install

ruby;">MongoMapper.connection = Mongo::Connection.new('localhost', 27017)MongoMapper.database ='todo'#通过指定Rails运行环境参数，我们可以在不同的运行环境下创建互不干扰的数据，为了简单起见，没有为不同的环境指定不同的数据

if defined?(PhusionPassenger)  PhusionPassenger.on_event(:starting_worker_process)do|forked|    MongoMapper.connection.connectifforked  endend

$ rails server

**Notice: C extension not loaded. This is required for optimum MongoDB Ruby driver performance.You can install the extension as follows:

gem install bson_ext

If you continue to receive this message after installing, make sure that thebson_ext gem is in your load path and that the bson_ext and mongo gems are of the same version.=> Booting WEBrick=> Rails 3.0.10 application starting in development on http://0.0.0.0:3000=> Call with -d to detach=> Ctrl-C to shutdown server[2011-10-19 23:36:14] INFO WEBrick 1.3.1[2011-10-19 23:36:14] INFO ruby 1.9.2 (2011-07-09) [x86_64-linux][2011-10-19 23:36:14] INFO WEBrick::HTTPServer#start: pid=19595 port=3000

rails generate scaffold project name:string --orm=mongo_mapper

classProject  include MongoMapper::Document  key:name,Stringend

mongo //进入数据库use todo //切换库db.projects.find() //执行查询

validates_presence_of:name

classProject  include MongoMapper::Document  key:name,String,:required=>true  key:priority,Integerend

#!/usr/local/bin/ruby# date:    06-12-2014# auther: lucifer# use fsync and lock to the file-system before backup the file-system# mongo-ruby-driver version > 1.10.0require 'mongo'require 'fileutils'require 'date'include Mongoinclude BSON# the members of replcation-set# test mongodb server version 2.6.0# host = "192.168.11.51"# The port of members# If the port is 27017 by default then otherport don't need to assignment# otherport = ""# port = otherport.length != 0 ? otherport : MongoClient::DEFAULT_PORT# opts = {:pool_size => 5, :pool_timeout => 10}# Create a new connection# client = MongoClient.new(host, port, opts)uri_string = "mongodb://caoqing:xxxxxxxx@x.x.x.x:27017/admin"client = MongoClient.from_uri(uri = "#{uri_string}")db = client['admin']# fsync and lock the databasecmd = OrderedHash.newcmd[:fsync] = 1cmd[:lock] = true# p cmddb.command(cmd)# datafile pathd = "/var/lib/mongo"# dir = Dir.new("#{d}")# entries = dir.entries# entries.delete_if { |entry| entry =~ /^/./}# convert the relative path to the full path# entries.map! { |entry| File.join(dir.path, entry) }# maintain only the type of file# entries.delete_if { |entry| !File.file?(entry) }# p entriesstart = Date.today.to_sprev = (Date.today - 7).to_sdest = "/backup/#{start}"sour = "/backup/#{prev}"FileUtils.rm_rf("#{sour}") if File::exist?("#{sour}")Dir.mkdir("#{dest}", 0755) unless File::exist?("#{dest}")FileUtils.cp_r Dir.glob("#{d}/**"), dest if client.locked?puts "*" * 20puts "/tbackup complete"puts "*" * 20# DB::SYSTEM_COMMAND_COLLECTION# unlock the databasedb["$cmd.sys.unlock"].find_oneclient.close