Fast Web Applications Development with Ruby on Rails on Oracle

FastWeb Applications

Developmentwith Ruby on Rails

on Oracle

github.com/rsim

Raimonds Simanovskis

What is Ruby on Rails?

Ruby isobject-oriented

dynamic

programming language

simple from outside

powerful insideYukihiro

Matsumotoor “Matz”

Ruby on RailsWeb applications development framework

Developed in Ruby

Extracted from 37signals Basecamp application

Open source software

Focused on developer productivity

Agile software development approach

Main principles

DRY - Don’t Repeat Yourself

Convention over Configuration

Opinionated software

MVC Architecture

ActionController

ActiveRecord

ActionView

Browser

Request Router

Res

pons

e

Database

class CreatePosts < ActiveRecor::Migration def self.up create_table :posts do |t| t.string :title t.text :body t.timestamps end endend

Active Record (Model)CREATE TABLE posts ( id NUMBER(38) NOT NULL, title VARCHAR2(255), body CLOB, created_at DATE, updated_at DATE);CREATE SEQUENCE posts_seq;

class Post < ActiveRecord::Base # nothing here!endpost = Post.newpost.title = "First post"post.savepost = Post.find(1)puts post.name # output: "First post"

Action Controllerclass PostsController < ApplicationController def index @posts = Post.all end

def show @post = Post.find(params[:id]) end

def new @post = Post.new end

# ...end

Action View

<h1>Posts</h1><% @posts.each do |post| %> <h2><%= post.title %></h2> <h3>Created at <%= post.created_at %></h3> <p><%= post.body %></p><% end %>

Demo

Ruby platformsMRI 1.8.7

Ruby/YARV 1.9.2

JRuby

Rubinius IronRuby MacRuby

MagLev BlueRuby

Ruby => Oracle

Ruby application

ruby-oci8

Oracle [Instant] Client Oracle Database

SQL*Net

require 'oci8'OCI8.new('scott', 'tiger').exec('select * from emp') do |r| puts r.join(',')end

JRuby => Oracle

Ruby application

JRuby

JDBC driver Oracle Database

SQL*Net

require "java"java.sql.DriverManager.registerDriver( Java::oracle.jdbc.driver.OracleDriver.new)conn = java.sql.DriverManager.getConnection( 'jdbc:oracle:thin:orcl', 'hr', 'hr')statement = conn.createStatementstatus = statement.execute( "SELECT * FROM employees")rs = statement.getResultSet()

ActiveRecordOracle enhanced

adapter

Ruby on Rails=> Oracle

gem install activerecord-oracle_enhanced-adapter

database.ymldevelopment: adapter: oracle_enhanced database: orcl username: blog password: blog

Multi-platform support

Ruby 1.8.7 Ruby 1.9.2 JRuby

ruby-oci8 ruby-oci8 JDBC

oracle_enhanced adapter

Oracle Data TypesRuby Rails Oracle

Fixnum :integer NUMBERFloat :float NUMBER

BigDecimal :decimal NUMBER, DECIMALTime :datetime DATETime :time DATEDate :date DATEString :string VARCHAR2String :text CLOBString :binary BLOB

True/FalseClass :boolean NUMBER(1), CHAR(1)

Legacy schemas

class Employee < ActiveRecord::Base set_table_name "hr_employees" set_primary_key "employee_id" set_sequence_name "hr_employee_s"

set_date_columns :hired_on, :birth_date_on set_datetime_columns :last_login_time

set_boolean_columns :manager, :active

ignore_table_columns :attribute1, :attribute2end

Alternative Ruby ORM

DataMapper

persistence framework

Not just for relational databases

DataMapper Modelclass Post include DataMapper::Resource property :id, Serial property :title, String, :length => 255, :nullable => false property :body, Text timestamps :atend

CREATE TABLE posts ( id NUMBER(38) NOT NULL PRIMARY KEY, title VARCHAR2(255) NOT NULL, created_at DATE, updated_at DATE);CREATE SEQUENCE posts_seq;CREATE TRIGGER posts_pkt...;post = Post.new

post.title = "First post"post.save

post = Post.get(1)puts post.name # output: "First post"

PL/SQL calls from Ruby(old way)

require "oci8"conn = OCI8.new("hr","hr","xe")

cursor = conn.parse <<-EOSBEGIN :return := test_uppercase(:p_string);END;EOScursor.bind_param(':p_string',"xxx",String)cursor.bind_param(':return',nil,String,4000)cursor.execputs cursor[':return']cursor.close

ruby-plsql gem

gem install ruby-plsql

require "ruby-plsql"plsql.connect! "hr","hr","xe"

puts plsql.test_uppercase('xxx')

ruby-plsql gemplsql.connect! "hr","hr","xe"

plsql.test_uppercase('xxx') # => "XXX"plsql.test_uppercase(:p_string => 'xxx') # => "XXX"plsql.test_copy("abc", nil, nil) # => { :p_to => "abc", # :p_to_double => "abcabc" }plsql.test_copy(:p_from => "abc", :p_to => nil, :p_to_double => nil) # => { :p_to => "abc", # :p_to_double => "abcabc" }plsql.hr.test_uppercase('xxx') # => "XXX"plsql.test_package.test_uppercase('xxx') # => 'XXX'plsql.hr.test_package.test_uppercase('xxx') # => 'XXX'

plsql.logoff

ActiveRecordwith

PL/SQLCRUD

procedures

class Employee < ActiveRecord::Base set_create_method do plsql.employees_pkg.create_employee( :p_first_name => first_name, :p_last_name => last_name, :p_employee_id => nil )[:p_employee_id] end set_update_method do plsql.employees_pkg.update_employee( :p_employee_id => id, :p_first_name => first_name, :p_last_name => last_name ) end set_delete_method do plsql.employees_pkg.delete_employee( :p_employee_id => id ) endend

Java integration with JRuby

require "java"java.lang.System.current_time_millis # => java.lang.System.currentTimeMillis()import java.lang.SystemSystem.properties['java.runtime.version'] # => System.getProperties[...]System.err = System.out # => System.setErr(System.getOut)

import javax.swing.JFrameimport javax.swing.JButton

f = JFrame.new("Swing Demo")f.set_size 400, 300f.layout = java.awt.FlowLayout.newbutton = JButton.new("Hello world!")f.add(button)f.show

Full-text indexesadd_context_index :posts, [:title, :body, # specify aliases always with AS keyword "SELECT comments.author AS comment_author, " + "comments.body AS comment_body " + "FROM comments WHERE comments.post_id = :id" ], :name => 'post_and_comments_index', :index_column => :all_text, :index_column_trigger_on => [:updated_at, :comments_count], :sync => 'ON COMMIT'

Post.contains(:all_text, "hello")Post.contains(:all_text, "{first} within title")Post.contains(:all_text, "{first} AND {post}")

Deployment options

Apache Java app sever

Ruby mod_passengerApplication WAR file

JRuby Gems

ApplicationApplication

Application source

Why Rails on Oracle?Fast agile / iterative development

Flexible HTML/CSS/JavaScript front-end

Test-driven development support

Easy to put on top of legacy applications

Open-source with liberal license

Libraries for all new “cool” technologies

More information

http://blog.rayapps.com

http://github.com/rsim/oracle-enhanced

http://groups.google.com/group/oracle-enhanced

Related sessionsSession ID: S318545

Title: Develop a Ruby on Rails Web Application with Oracle Database 11g in One Hour

Schedule: Thursday, September 23, 12:30 | Hilton San Francisco, Franciscan A / B / C / D

Session ID: S319104

Title: PL/SQL Unit Testing Can Be Fun!

Schedule: Tuesday, September 21, 09:30 | Hotel Nikko, Bay View

JRuby meetupTuesday, September 21

@ Engine Yard500 3rd Street, Suite 510

5:30 - 7:00 Networking + beer + food7:00 - 8:00 Lightning talks