Download E-books Ruby on Rails for PHP and Java Developers PDF

Posted On January 30, 2017 at 8:15 am by / Comments Off on Download E-books Ruby on Rails for PHP and Java Developers PDF

By Deepak Vohra

This ebook covers constructing net purposes with Ruby on Rails. It discusses Ajax, listing companies, and internet prone. The ebook info the configuration of Ruby on Rails with diverse databases equivalent to MySQL, Oracle and SQL Server 2005. moreover, it makes a comparability with Hypertext Preprocessor, the main widely used scripting language for constructing net purposes. The publication additionally offers instance purposes that could be converted to fit a developer’s application.

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6 growing an XML rfile from a Database C:\ruby\databasexml> catalog ruby script/generate 181 version A version script app/models/catalog. rb and a migration script db/migrate/ 001_create_catalogs. rb get created. The migration script classification, CreateCatalogs, extends the ActiveRecord::Migration classification. The default migration script comprises tools self. up and self. down. The self. up procedure is is invoked to use a migration and create a database desk. The create_table transformation of sophistication ActiveRecord::Migration is used to create a database desk catalogs. ActiveRecord makes use of pluralization to map a version category to a database desk. The version classification is singular and top case and the database desk is plural and reduce case. within the instance Ruby on Rails program, the version type is Catalog and the database desk is catalogs. we have to regulate the migration script 001_create_catalogs. rb to create a database desk and upload info to the desk. within the create_table transformation create a desk catalogs with columns magazine, writer, variation, identify, writer as proven less than. type CreateCatalogs < ActiveRecord::Migration def self. up create_table :catalogs do |t| t. column :journal, :string, :limit => 255 t. column :publisher, :string, :limit => 255 t. column :edition, :string, :limit => 255 t. column :title, :string, :limit => 255 t. column :author, :string, :limit => 255 finish Catalog. create :journal => "Oracle Magazine", :publisher => "Oracle Publishing", :edition => "JulyAugust 2005", :title=> "Tuning Undo Tablespace",:author=>"Kimberly Floss" Catalog. create :journal => "Oracle Magazine", :publisher => "Oracle Publishing", :edition => "September-October 2005", :title=> "Creating seek Pages",:author=>"Steve Muench" finish def self. down drop_table :catalogs finish finish 182 6 XML On Rails we have to run the migration script with the rake command and the db:migrate aim. C:/ruby/databasexml>rake db:migrate Database desk catalogs will get created in Oracle database. subsequent, we have to create a controller script to generate an XML rfile from the database desk. Specify controller category as catalog and outline a controller motion gen_xml. C:/ruby/databasexml>ruby script/generate controller catalog gen_xml Controller script app/controllers/catalog_controller. rb will get created as proven under. classification CatalogController < ApplicationController def gen_xml finish finish within the controller type we have to create a Builder::XmlMarkup item. The indentation is decided with the :indent choice and the margin is determined with the :margin alternative. @xml = Builder::XmlMarkup. new (:indent=>2, :margin=>4) An XmlMarkup item isn't required to be created. An XmlMarkup item, @xml, is offered via default in an . rxml view template. An XmlMarkup item could be created to specify extra techniques resembling :indent and :margin. subsequent, retrieve info from Oracle database desk catalogs, which was once set within the version script utilizing the find(:all) strategy. the outcome set of the database question is kept in example variable @catalogs, which might be to be had in view templates for the catalog controller.

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