Book Image

ColdFusion 9 Developer Tutorial

By : John Farrar
Book Image

ColdFusion 9 Developer Tutorial

By: John Farrar

Overview of this book

Adobe ColdFusion is an application server, renowned for rapid development of dynamic websites, with a straightforward language (CFML), powerful methods for packaging and reusing your code, and AJAX support that will get developers deep into powerful web applications quickly. However, developing rich and robust web applications can be a real challenge as it involves multiple processes.With this practical guide, you will learn how to build professional ColdFusion applications. Packed with example code, and written in a friendly, easy-to-read style, this book is just what you need if you are serious about ColdFusion.This book will give you clear, concise, and practical guidance to take you from the basics of ColdFusion 9 to the skills that will make you a ColdFusion developer to be reckoned with. It also covers the new features of ColdFusion 9 like ORM Database Interaction and CF Builder.ColdFusion expert John Farrar will teach you the basics of ColdFusion programming, application architecture, and object reuse, before showing you a range of topics including AJAX library integration, RESTful Web Services, PDF creation and manipulation, and dynamically generated presentation files that will make you the toast of your ColdFusion developer town.This book digs deep with the basics, with real-world examples of the how and whys, to get more done faster with ColdFusion 9.
Table of Contents (22 chapters)
ColdFusion 9 Developer Tutorial
Credits
About the Author
About the Reviewers
Preface
Index

Chapter 5. Application, Session, and Request Scope

There is a huge difference between a web application and a dynamic web page. Web applications persist basic information, so we can create things such as shopping carts, user authentication (login and logout), and much more. HTML helps us to click through pages with links. In this chapter, we will learn how we can use web server memory to create engaging and interactive web applications by using variable scopes.

Further, we are going to discover the differences between application, session, and request scopes. We will learn how to share some information and how to protect the rest of the information in a controlled manner. In this chapter, we will have a look at the following topics:

  • The life expectancy for various types of information. This affects the system memory and the place where different information is stored.

  • The Application.cfc object class—the cornerstone of ColdFusion applications.

  • The special standard method events, which ColdFusion...