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ColdFusion 9 Developer Tutorial

You're reading from   ColdFusion 9 Developer Tutorial Create robust professional web applications with ColdFusion

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Product type Paperback
Published in Jul 2010
Publisher Packt
ISBN-13 9781849690249
Length 388 pages
Edition 1st Edition
Languages
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Author (1):
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John Farrar John Farrar
Author Profile Icon John Farrar
John Farrar
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Table of Contents (22) Chapters Close

ColdFusion 9 Developer Tutorial
Credits
About the Author
About the Reviewers
1. Preface
1. Web Pages—Static to Dynamic 2. Basic CFCs and Database Interaction FREE CHAPTER 3. Power CFCs and Web Forms 4. ORM Database Interaction 5. Application, Session, and Request Scope 6. Authentication and Permissions 7. CFScript 8. CF AJAX User Interface 9. CF AJAX Forms 10. CF AJAX Programming 11. Introduction to Custom Tags 12. ColdFusion Powered Views 13. Control Logic Processing 14. Guide to Unit Testing Beyond this Book Tools and Resources 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...

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