Book Image

Rhomobile Beginner's Guide

By : Abhishek Nalwaya
Book Image

Rhomobile Beginner's Guide

By: Abhishek Nalwaya

Overview of this book

The four Rhomobile products – Rhodes, Rhosync, RhoHub, and Rhogallery – provide a complete toolkit for creating a mobile application. Rhomobile is cross-platform and so allows you to build your application for many different types of smartphone – including iPhone and Blackberry – just with a single codebase. This makes it the most preferred and quickest way of developing mobile apps. As you create a native Rhomobile application, you can use the built-in device features such as GPS, Push, and Camera, all with offline capabilities.Rhomobile Beginner's Guide is filled with practical examples to help you to create a mobile application from scratch. You can choose on which operating system to build, as well as for which smartphone to develop your application, giving you the freedom to create a customized mobile application quickly and easily.Once you have learned how to install Rhomobile on Windows, Mac, or Linux, you will create a simple application, which will be used to explore the products of Rhomobile one by one. Things really get going when you write unit test cases for your application before deploying it to the server and making builds for your chosen Smartphone. You will learn about the different aspects of Rhomobile, starting with Rhodes 3, which helps you to build a native mobile application. Rhosync 2.1 carries out the offline device capabilities and RhoHub deploys the code on the server and creates a build for the different smartphones. Rhomobile Beginner's Guide gives you the freedom to create a mobile web application on the platform of your choice, for the smartphone of your choice.
Table of Contents (17 chapters)
Rhomobile Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

How Rhodes stores data


As we have already discussed, iPhone and Android use SQLite. And for Blackberry it uses SQLite on a device it supports, otherwise it will use HSQL database. But the question is how does Rhom store data and how can we handle migration?

Rhodes provides two ways to store data in a phone:

  1. Property Bag

  2. Fixed Schema

Property Bag

Property Bag is the default option available for our models. In Property Bag, the entire data is stored in a single table with a fixed number of columns.

The table contains the following columns:

  • Source_id

  • attribute

  • object

  • value

  • update_type

When you use the Property Bag model, you don't have to track schema changes (adding or removing attributes). However, Rhodes uses the Property Bag schema to store app data in a SQL database. If the internal Property Bag schema changes after an application is updated or reloaded, the database will be (re)created and all existing data would be erased. See rhodes\lib\rhodes.rb and rhodes\lib\framework\rhodes.rb for the internal...