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

Practical application


In this section, we are going to discuss a couple of variations on where and how to use scoped persistence. This means by using one of the scopes listed earlier, we can have a variable or CFC object last for the entire visibility period in the table.

Let us say we create a CFC called user.cfc, and then inside the Application.cfc in the onSessionStart() method, we created an instance of the class. We would want our object to last for the full life of our session. We would create code similar to this to enhance our former code for the sessionStart method. If we check out the example code on the site, the user.cfc file has already been created. Here is the modified version. The modified code is an example of how we would create a persistent object for the user. It would last until the session expires. One of the best things about application, session, and request scoped variables and objects is that they exist until that scope expires and the server takes care of clearing...