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Home > Programming > Application Development > ColdFusion 9 Developer Tutorial
ColdFusion 9 Developer Tutorial
ColdFusion 9 Developer Tutorial

ColdFusion 9 Developer Tutorial: Create robust professional web applications with ColdFusion

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ColdFusion 9 Developer Tutorial

Chapter 2. Basic CFCs and Database Interaction

All of the major software platforms have different forms of objects. In ColdFusion, these are called ColdFusion Components (CFCs). CFCs let us package up and reuse code in ways that will make our development much easier. Our approach in this book will be to learn by doing. In this chapter, we will learn by building the start of a simple shopping system. We will also learn to work with databases. Let's start learning the easier way to write software with CFCs. The following is a list of the contents that will be covered in this chapter:

  • The ColdFusion object called CFC

  • Making objects/CFCs come alive with methods

  • The difference between a class and the objects created from the CFC

  • Using an object constructor

  • Protecting the inner characteristics of objects with getters and setters

  • Connecting to a database through the internal methods of our object/CFCs

  • A variable structure called a "query", which is used to hold query recordsets

  • Controlling different types...

Our first CFC

We start by creating a file that ends with .cfc when creating CFCs. Non-CFC files that you have been creating up to this point, and will also continue to create, end with .cfm.

Each CFC is wrapped by a set of tags and has one or more functions, which are also referred to as methods. We will be creating an object class. There are different types of objects, and a CFC is the type we normally use in ColdFusion. Now, let us look at some empty code, so you can get an idea of what one might look like:

<cfcomponent>
  <cffunction>
  </cffunction>
</cfcomponent>>

Certainly, we cannot do much with this segment of code. This is just for us to get a first glimpse of CFC code. Here, we get an idea of what it is and start our journey of discovery. You see there is a <cfcomponent> tag that surrounds the whole CFC. You can add additional attributes, but for now we are going to keep it as simple as possible and try to learn how to write CFCs without getting bogged...

Our first object

Our first object is a generic model of a product. There are things that different products have in common. This object will be a combination of the common attributes and methods. The difference is that this is a computer object. Yet, we will do things in ways that reflect the real world. Our product object has attributes and methods. We will map them out here below. Remember, this will all make more sense as we work through this chapter. Along the way, you will get an understanding of both how CFCs work and how to interact with a database.

Product (object)

The attributes are as follows:

  • name

  • description

  • price

The methods are as follows:

  • set_name()

  • get_name()

  • set_description()

  • get_description()

  • set_price()

  • get_price()

We will continue to learn as we work through these examples and we will also continue to refine this to make it even better. We need to build our foundations of understanding first. Now, we will look at an example of this in the following code:

...

Using an object constructor

We will modify our code just a little bit to correct the missing variable using the constructor init() method. Modify the createObject line by adding .init(); to the end as shown in the following highlighted line. You will find that you can tack on a method you want to call at the time of creating an object, all on the same line. This is a common method among developers. When you use a constructor, you should always return the this variable to the caller. this is the variable scope of an object that refers to itself and this returns a reference to the object itself. That will correctly pass the object back when you place the constructor at the end of the creation of the object. If you look at the init method in the CFC, you will find that we include it with the <cfreturn this>.

<!--- Example: 2_2b.cfm --->
<!--- Processing --->
<cfscript>
  objProduct = createObject("component","product_1").init();

You will also notice that we are pulling...

Connecting to a database

Developers used to code the data and presentation into the same file. There was no "data layer" for developing software; it was all mixed on the same page. This made the pages longer and there was much more to work through to figure out bugs or page enhancements. It was pretty much what we call "information overload". CFCs change that by encapsulating the data as a separate layer. Then the interface serves as a simpler way to push and pull data to and from your database.

Note

If you haven't set up your database, then refer to Appendix A and set that part of your environment up for this section first. If you are not skilled with databases, then we have suggestions in Appendix B. You don't need that as we write the ones that you need in the code examples of this book.

Here we will create another version of our product.cfc object class. Let's name it product_2.cfc so we can keep things separate in case you want to go back and compare them later. Let's take a look at the...

Returning data from the CFC

Lastly we return the rsReturn variable to the caller. You will note that this has changed the variable type to a ColdFusion query which is the name for the returned recordset from <cfquery>.

Now we need to create a calling page. We have to see what is coming back from the database and how it looks inside ColdFusion. Here is the code to our calling page.

<!--- Example: 2_4.cfm --->
<!--- Processing --->
<cfscript>
  objProduct = createObject("component","product_2").init();
  rsProducts = objProduct.getRecordset();
</cfscript>
<!--- Content --->
<cfdump var="#rsProducts#">

We see something new in the recordset dump since ColdFusion version 8. This version includes the attributes for cached, execution time, and the SQL that was run to produce the query. These can be very helpful for development, debugging, and logging. You will also see that the result set displays each row in a table. Each of the fields returned from the database...

Making our data query flexible

We set the default value so the page doesn't fail if there is no value for the ID variable passed in. We added the singular getProduct variable. It actually returns a recordset just like rsProducts returns a recordset. The only difference is that this will return a single record after we modify the CFC. Currently the CFC doesn't handle the where argument even though it is part of the method. We have to build in the functionality. This is what the method should look like now. Change the highlighted lines to make this method work correctly. As we are not adding the query type to the <cfoutput> tag inside the if condition where there is only one record, it will not loop through the query. It will only return the first record in the recordset. In this instance there is only one record, so that would be the same. This information is just for future reference, so we will understand why only one row appears on our web page and why we have to declare the query...

The basic data object concept

Now we create the function for assigning the encapsulated variables of the object when it is created. We are now ready to write the next version of the calling page. We are only going to change two things on that page. We will change the line where we were creating a second recordset to a call to the method for performing the assigning of the internal variable values in the object. Then we will change our content section of the code to use the object getters to pull the encapsulated variable values. The highlighted rows are the ones changed.

<!--- Example: 2_6.cfm --->
<!--- Processing --->
<cfparam name="url.id" default="0">
<cfscript>
  objProduct = createObject("component","product_2").init();
  rsProducts = objProduct.getRecordset();
  objProduct.load(url.id);
</cfscript>
<!--- Content --->
<ul><cfoutput query="rsProducts">
  <li><a href="?id=#rsProducts.id#">#rsProducts.name#</a></li&gt...

Object method access control

Generally, objects are not intended to create output other than returning actual variables. That is why the attributes output="false" have been added all over the CFC code. You will also notice that there is an attribute called access="public" in many of the methods. There are actually a number of settings for this. All of these indicate where the calling code must be for the method to run. Here is a list of the settings and definitions for each one:

  • Public: This is the most common and default setting, if not declared. It means that any code on the server can call the object method and it will run.

  • Private: In this case, the method may only be called from within the CFC. In practice, we would have taken our setAttribute() method and made it private. This method would normally be called only from within the actual CFC and never from outside the CFC.

  • Package: This is the condition where code only in the same directory may call the method. The term package comes from...

Summary

One of the biggest advantages of CFCs is the ability to encapsulate logic. This means that we can use the same code over and over without writing it over and over. This makes initial development better. It also makes debugging and updates much more manageable. In this chapter you have just started to get a taste of the power of objects. We will be using them often throughout the rest of this book. This chapter was meant to give you a foundation to understand what follows in the remaining chapters.

Lessons learned in Chapter 2 are:

  • We learned how to create object classes and instantiate object instances.

  • We learned how to create methods, and use the methods and method arguments to interact with objects.

  • We learned how to use object constructors for setting object information at the time of creation.

  • We learned how to use getters/setters to securely control the information inside an object. We also learned that with these methods, you can do more than just setting and getting the values...

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Page 1 of 10

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Key benefits

  • Fast-paced guide to the foundational concepts of developing in ColdFusion
  • Broad coverage of CFScript to deal with its expanded power in ColdFusion 9
  • Enhance the user interface with built-in ColdFusion AJAX features (layout, forms, script, maps, and more)
  • Packed with example code and real-world knowledge

Description

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.

Who is this book for?

This book is for web developers working with ColdFusion 9. If your goal is to get a good grounding in the basics of the language as quickly as possible and put a site together quickly, this book is ideal for you. This book will also help you if you want to learn more about professional programming of ColdFusion.No prior knowledge of ColdFusion is expected, but basic knowledge of general web and software development skills is assumed.

What you will learn

  • Foundational Concepts of Developing in CFML (ColdFusion Markup Language)
  • How to make your ColdFusion Components (CFCs) come alive with methods, using object inheritance, connecting to a database through the internal methods of your object/CFCs
  • Managing multiple products through common forms for listing, editing, and adding data
  • Debugging and unit testing techniques
  • How to pass information into a custom tag and learn the different methods of storing and accessing tags and tag libraries
  • Enhancing the user interface with built-in ColdFusion AJAX features (layout, forms, script, maps, and so on)
  • Managing files, emails, and images through CFML
  • Power mixing CFCs and custom tags using COOP library as an example to simplify view coding and understand event based objects
  • ORM database interaction covering the new data integration of Hibernate
  • The working of different variable scopes
  • Applications and authenticating users for roles and permissions
  • Integrating Feed, REST, and SOAP web services to interact with other sites
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Publication date : Jul 21, 2010
Length: 388 pages
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Language : English
ISBN-13 : 9781849690249
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Category :
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Languages :
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Concepts :
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Tools :
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Category :
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Languages :
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Tools :
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Table of Contents

14 Chapters
Web Pages—Static to Dynamic Chevron down icon Chevron up icon
Web Pages—Static to Dynamic
Turning HTML into a dynamic web page
Understanding and using simple variables
Understanding structures
Let's get interactive
Setting page defaults
Introduction to lists and loops
Understanding arrays
Conditional processing with If/<cfif>
Conditional processing with switch
Summary
Basic CFCs and Database Interaction Chevron down icon Chevron up icon
Basic CFCs and Database Interaction
Our first CFC
Our first object
Using an object constructor
Connecting to a database
Returning data from the CFC
Making our data query flexible
The basic data object concept
Object method access control
Summary
Power CFCs and Web Forms Chevron down icon Chevron up icon
Power CFCs and Web Forms
The practice of protecting access
Web forms introduction
Managing our product data
Getting data to our edit page
Saving our data
Improving page flow
Adding a new record
Let's look under the hood
Summary
ORM Database Interaction Chevron down icon Chevron up icon
ORM Database Interaction
Introduction to ORM in ColdFusion
Working with entity-object relationships
ORM functions
Summary
Application, Session, and Request Scope Chevron down icon Chevron up icon
Application, Session, and Request Scope
Life span
Introducing the Application.cfc object
Application variables
The start methods
The end methods
Scope visibility
Practical application
Universal datasource
Mappings per application
Custom tag paths per application
Summary
Authentication and Permissions Chevron down icon Chevron up icon
Authentication and Permissions
How ColdFusion recognizes users
Custom authentication (additional power)
Extra notes
Summary
CFScript Chevron down icon Chevron up icon
CFScript
Script basics
Exception handling
New functions/commands in CF9
Summary
CF AJAX User Interface Chevron down icon Chevron up icon
CF AJAX User Interface
Changing times
ColdFusion AJAX
Styling notes
Tips
Map interaction
Summary
CF AJAX Forms Chevron down icon Chevron up icon
CF AJAX Forms
AJAX forms
Grid updates and deletes
Linked grids
The date requestor
The autosuggest box
The directory tree
Message boxes
Progress bar
Summary
CF AJAX Programming Chevron down icon Chevron up icon
CF AJAX Programming
Binding
Bind with event
Extra binding notes
Multiple radio buttons or checkboxes and multiple select
Spry binding
CFAJAXProxy
CFC proxy class objects
Client debugging
Firebug
Built-in debugging
Summary
Introduction to Custom Tags Chevron down icon Chevron up icon
Introduction to Custom Tags
Different forms of code reuse
Custom tags
Custom header/footer tags
Nested tags
CFInclude from custom tags
Templates versus skins
Managing custom tags
CFModule approach
Tag library approach
Summary
ColdFusion Powered Views Chevron down icon Chevron up icon
ColdFusion Powered Views
What is open source?
The fun factor
Happily separated
Turning lemons to lemonade
Fun with lists
Better form coding
Custom list item rendering
Summary
Control Logic Processing Chevron down icon Chevron up icon
Control Logic Processing
The code side of applications
Shared variables
Processing request events
Remote AJAX events
Data versatility
Personal extension of COOP
Summary
Guide to Unit Testing Chevron down icon Chevron up icon
Guide to Unit Testing
When to test
Installing our testing software
Understanding assertions
Testing private methods
Testing included files and custom tags
A son's view of testing
Summary

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(4 Ratings)
5 star 25%
4 star 50%
3 star 0%
2 star 25%
1 star 0%
no ego Feb 06, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
What a great ColdFusion Book even in 2020. Just look at CF version adds and depreciations to lead you from this book to current. Hope the authors write a 2020 updated version!!
Amazon Verified review Amazon
Art Luverr Oct 18, 2010
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
The educational method used by the author is different and very to the point. Do as he says, the lessons need to be performed as they are being read to receive the value of the lesson. Written with minimalist background commentary. Refreshing and somewhat foreign, but an effective way to learn higher level coldfusion (CF9). I also liked the brevity of the first book (CF8). A little of this and a little of that covers most bases without ranging too broadly or too deep.Considering the paucity of any Coldfusion books available, it is recommended - another addition to the meager coldfusion library that I have been able to assemble.When is O'Reilly going to update their coldfusion tutorial/appendix contributions? Hunh? I liked their Coldfusion MX book.
Amazon Verified review Amazon
L. Holman May 25, 2013
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
After reading and using Coldfusion since 2006, it was good to have someone other than Ben Forta or Ray Camden write a book about the topic.
Amazon Verified review Amazon
Shelby Hill Jan 13, 2011
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
There were/are tons of typo's in the code samples and throughout. In addition 0 - ZERO effort was made to update the book from Coldfusion 8. The samples and images still have references made to CF 8. Some of the code simply wouldn't work as it was written even after removing the typos. The last 3 chapters of the book were devoted to packages outside of Coldfusion. This bothered me a little as it wasn't a whose who but more of a use this. A tutorial is suppose to teach you how to get up and running and be successful not pimp other group's projects.In the end I had to give it a couple stars because I did manage to learn the material; however, in some cases it's because I had to fix so many typos and figure out the right way to do something. I spent a lot of time looking up issues with Google.And don't even bother looking at the blog they point you to in the beginning of the book. It's simply a shell with no substance. To get the code samples you actually need to go to the Packt publishing website. The samples don't match up very well with the book either. Many times when you look at what he tells you to type and use and then go look at the sample it will have twice as much code in it.In one particular section he doesn't even tell you about a bunch of components you need that he just glosses over. It would have been better to spend a chapter on these extended components and how to do that instead of those other third party tag packages at the end of the book.
Amazon Verified review Amazon

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Event-Driven Architecture in Golang
Event-Driven Architecture in Golang
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Nov 2022 384 pages
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50 Algorithms Every Programmer Should Know
50 Algorithms Every Programmer Should Know
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Sep 2023 538 pages
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About the author

Profile icon John Farrar
John Farrar
John started working with computer programming around 1977. He has had the opportunity to work on projects used by Apple, Blue Cross, Brunswick Recreation, Casio, GVSU, Johnson Controls, Sprint, and many others. This history covers over 30 years of knowledge and experience in the industry. He started doing web development over 10 years ago. In the early days of the Web ColdFusion stood out to him not just as a way to make web pages into web applications but as a maturing solid platform good for the developer, site owner, and end users. He started at version 4.5 and has been enjoying each version upgrade more and more. John owns a company called SOSensible. His company does work for large companies but has a special focus on also making sure technology is approachable beyond the enterprise. They have developed a number of Open Source solutions including COOP. COOP is a mix of Custom Tags and CFCs that provides structure while keeping development simpler. It demonstrates his love for the things that make ColdFusion/CFML a delightful language to build websites. He has spoken at national and regional conferences, online meetings, and area user group meetings. He is also an Adobe User Group manager. John knows that community is a viable and productive tool to build developers and the companies they serve. He has learned much from great resources in the community including bloggers, books, conferences, and resources to great in number to mention here. He blogs at <a href="http://www.sosensible.com/index.cfm/blog/index/">sosensible.com</a> for the community. <a href="mailto:johnfarrar@sosensible.com">Contact John Farrar</a>
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Shipping Details

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Economy: Delivery to most addresses in the US within 10-15 business days

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Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
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Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

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Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

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  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
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  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
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  16. Ukraine
  17. Venezuela