ColdFusion 9 Essential Training
Illustration by Richard Downs

Retrieving data for an update form


From:

ColdFusion 9 Essential Training

with David Gassner

Video: Retrieving data for an update form

ColdFusion makes it very easy to create a single page that's used for both inserting and updating data. I am going to repurpose the edit.cfm file and turn it from a form that only inserts data right now to one that can be used for both inserting and updating. I'll start in the list page, index.cfm. That's showing me a list of my photographers, and I'll add another column with hyperlinks that the user can click to edit an existing photographer record.
Expand all | Collapse all
  1. 5m 55s
    1. Welcome
      1m 24s
    2. Using the exercise files
      2m 50s
    3. Overview
      1m 41s
  2. 35m 16s
    1. Understanding application servers
      7m 3s
    2. Installing ColdFusion 9 on Windows
      5m 28s
    3. Installing ColdFusion 9 on Mac OS X
      6m 20s
    4. Completing the Configuration wizard
      1m 50s
    5. Starting and stopping ColdFusion on Windows
      4m 7s
    6. Starting and stopping ColdFusion on Mac OS X
      2m 37s
    7. Installing ColdFusion Builder on Windows
      4m 13s
    8. Installing ColdFusion Builder on Mac OS X
      2m 1s
    9. Setting folder permissions on Mac OS X
      1m 37s
  3. 45m 34s
    1. Using Eclipse perspectives and views
      5m 42s
    2. Defining a ColdFusion server
      8m 42s
    3. Creating a ColdFusion project
      4m 40s
    4. Creating and browsing a ColdFusion page
      5m 36s
    5. Defining a default page template
      3m 58s
    6. Setting and outputting variables
      7m 55s
    7. Using the Snippets view
      4m 49s
    8. Using an external browser
      2m 8s
    9. Using online help
      2m 4s
  4. 35m 49s
    1. Adding numbers and concatenating strings
      8m 7s
    2. Using Debug Output
      6m 10s
    3. Inspecting variables with ‹cfdump›
      4m 55s
    4. Using arrays
      5m 21s
    5. Using structures
      3m 51s
    6. Configuring the line debugger
      1m 25s
    7. Using the line debugger
      6m 0s
  5. 53m 45s
    1. Scripting an Apache Derby database
      3m 34s
    2. Defining a data source in ColdFusion Administrator
      6m 13s
    3. Exploring data sources in RDS Dataview
      4m 2s
    4. Using SQL and the ‹cfquery› tag
      6m 58s
    5. Outputting data from a query object
      4m 2s
    6. Outputting a dynamic HTML table from a query
      7m 0s
    7. Generating alternating row colors
      6m 55s
    8. Creating an application directory and home page
      5m 26s
    9. Displaying data on the home page
      5m 43s
    10. Redirecting requests with ‹cflocation›
      3m 52s
  6. 32m 17s
    1. Including pages with ‹cfinclude›
      4m 21s
    2. Creating reusable header and footer files with ‹cfinclude›
      4m 39s
    3. Creating and calling custom tags
      3m 8s
    4. Passing data into custom tags
      2m 34s
    5. Setting default values for custom tag attributes
      4m 51s
    6. Calling custom tags with ‹cfmodule›
      3m 54s
    7. Using a custom tag as a website header
      3m 55s
    8. Creating an application template file
      4m 55s
  7. 52m 6s
    1. Creating a ColdFusion Component (CFC)
      5m 6s
    2. Declaring CFC functions
      3m 28s
    3. Calling CFC methods with ‹cfinvoke›
      2m 28s
    4. Using CFC properties
      4m 51s
    5. Passing data into functions
      3m 38s
    6. Creating and calling CFCs with script syntax
      5m 25s
    7. Generating data access CFCs in ColdFusion Builder
      4m 35s
    8. Calling generated data access methods
      7m 41s
    9. Creating a dynamic HTML table from an array
      8m 8s
    10. Creating an Application.cfc file
      3m 11s
    11. Using an application data source variable
      3m 35s
  8. 32m 56s
    1. Generating an ORM map component
      7m 58s
    2. Enabling an application to use ORM
      1m 58s
    3. Retrieving data with ORM
      2m 55s
    4. Generating mappings for multiple tables
      4m 22s
    5. Filtering data with ORM
      5m 35s
    6. Displaying result data with a custom tag
      10m 8s
  9. 27m 58s
    1. Passing URL variables in hyperlinks
      6m 13s
    2. Passing multiple URL variables
      2m 50s
    3. Encoding URLs with URLEncodedFormat()
      4m 12s
    4. Checking for available variables with isDefined()
      2m 41s
    5. Creating a data-driven hyperlink
      5m 4s
    6. Displaying selected data in a detail page
      6m 58s
  10. 40m 36s
    1. Using HTML data entry forms
      6m 53s
    2. Processing form variables
      3m 24s
    3. Creating self-posting forms with ‹cfform›
      4m 40s
    4. Creating a search interface
      3m 9s
    5. Processing complex queries with HQL
      8m 53s
    6. Creating a dynamic pulldown list with ‹cfselect›
      7m 16s
    7. Displaying form results
      6m 21s
  11. 43m 45s
    1. Building a data entry form for managing data
      5m 15s
    2. Preparing an ORM mapping for inserting data
      3m 47s
    3. Inserting data with ORM
      5m 23s
    4. Retrieving data for an update form
      4m 16s
    5. Populating form controls with existing data
      5m 2s
    6. Updating data with ORM
      2m 56s
    7. Confirming actions with an Ajax message box
      7m 21s
    8. Using JavaScript callback functions
      3m 15s
    9. Deleting data with ORM
      6m 30s
  12. 9m 37s
    1. Defining client-side form validation rules
      4m 14s
    2. Validating on the server with custom CFML
      5m 23s
  13. 18m 9s
    1. Using the Application.cfc onRequest() method
      4m 12s
    2. Creating and using a login form
      4m 53s
    3. Authenticating users with ‹cflogin›
      6m 1s
    4. Logging out users
      3m 3s
  14. 7m 11s
    1. Configuring an FTP site
      2m 27s
    2. Setting a ColdFusion project's synchronization connection
      2m 17s
    3. Uploading files to the production server
      2m 27s
  15. 46s
    1. Goodbye
      46s

Start your free trial now, and begin learning software, business and creative skills—anytime, anywhere—with video instruction from recognized industry experts.

Start Your Free Trial Now
please wait ...
Watch the Online Video Course ColdFusion 9 Essential Training
7h 21m Beginner Oct 05, 2009

Viewers: in countries Watching now:

ColdFusion 9 Essential Training is a detailed overview of ColdFusion, demonstrating each of the components and tools necessary to create dynamic web sites and web applications. Author and web developer David Gassner starts this course at the very beginning: how to set up a ColdFusion application server in both the Windows and Mac OS X operating systems. Using the new ColdFusion Builder, David explains the data types and code necessary to build and deploy dynamic web pages. Throughout the course, he shows how to build web pages and forms and populate these containers with dynamic data using ColdFusion ORM (Object Relational Mapping), a new feature of ColdFusion 9. Exercise files accompany this course.

Topics include:
  • Using ColdFusion Builder to define a default page template
  • Defining a data source with ColdFusion Administrator
  • Creating data access ColdFusion Components (CFCs) in ColdFusion Builder
  • Using ColdFusion ORM (Object Relational Mapping)
  • Applying dynamically developed URLs to datasets
  • Validating data entry forms and defining client-side validation rules
  • Using JavaScript callback functions to present and manipulate AJAX-style user interface components
Subjects:
Developer Web
Software:
ColdFusion
Author:
David Gassner

Retrieving data for an update form

ColdFusion makes it very easy to create a single page that's used for both inserting and updating data. I am going to repurpose the edit.cfm file and turn it from a form that only inserts data right now to one that can be used for both inserting and updating. I'll start in the list page, index.cfm. That's showing me a list of my photographers, and I'll add another column with hyperlinks that the user can click to edit an existing photographer record.

In the source code I'll go first to the Header row and I'll add a new pair of th's. I am not going to put any text in between these tags, because I don't need to display anything at the top of the column. Then I'll go to the line of code that shows the link for the photo list. I'll click into that line of code and then clone it, pressing Ctrl+Alt+Down on Windows or Command+Alt+Down on Mac, and I'll make some changes to that code. In the second link, I'll set the href to point to edit.cfm and I'll change the text from Photos to Edit.

Now, when I run the page in the browser, I see a hyperlink for each photographer and when I click that link, I'll go to the form page and the next part of the job is to fill in the form with the existing data from the photographer record that the user selected. I'll go back to Source and I'll go to the edit.cfm file. I am going to add a little bit more conditional logic to the page and detect whether I received that URL variable, photographerid.

After the existing if clause, I'll add else if, and then in a pair of parentheses isDefined and I'll look for the variable photographerid and I'll add a pair of curly braces right after the else if clause. So now, I have one section for when the page is submitted from the form and a second conditional section that will be executed if the user gets to this page by clicking on one of the edit links in the list page. So, I have my drill down system to get from one page to another.

In this page, I'll retrieve the one and only photographer data row that the user selected. I'll do that with a method called entityLoadByPK. This is a different version of the entityLoad method that we've used before. The entityLoad method on its own returns an array of photographer objects. When you know you need only one photographer object though, you can use entityLoadByPK. You'll pass in the primary key value that identifies the object and instead of an array you'll get back just that object.

The code will look like this. Photographer = entityLoadByPK and then I'll pass in two arguments. The name of the orm entity I want, photographer, and remember that that must be case sensitive and exact, and then the primary key value, which is provided in url.photographerid. So now, let's test the drill-down architecture. I'll place the cursor after the cfscript section and put in a little bit of temporary code for debugging.

cfif isDefined photographer and I am looking for the photographer variable here and then I'll put in a cfdump tag with a var attribute of photographer. And then after the cfdump I'll put in a cfabort. Again, this is a temporary debugging code so I can see what happens when the page is loaded from the list page. I'll save the changes to the form page and go to index.cfm. I'll run that page in the browser and click on the first link and I'll see that I've successfully retrieved the one and only photographer from the table that was requested.

I'll go back to Source and run it in the browser again, and click on another link. And once again, I am confirming that I am getting back the data that's requested. So now, you've retrieved the data based on the drill-down hyperlink and in the next video, I'll show you how to fill in the form controls from the existing data.

Find answers to the most frequently asked questions about ColdFusion 9 Essential Training .


Expand all | Collapse all
please wait ...
Q: While trying to build a dynamic site as instructed in the ColdFusion 9 Essential Training title, an error occurred when setting up the Date & Services > Data Sources page as shown in the "Defining a data source in ColdFusion Administrator" movie:

Connection verification failed for data source: dw_bookstore. com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up. 

Also, attempts to connect to the database using phpMyAdmin were not successful. Is there a fix to this problem?
A: If the connection to phpMyAdmin is not working, starting over with the installation of MySQL is the best bet. Uninstall WampServer, then reinstall and set up the database again. If that software is not working, the connection to the database from will not be possible from ColdFusion.
 
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ .

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Join now Already a member? Log in

* Estimated file size

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed ColdFusion 9 Essential Training.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member ?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferences from the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Learn more, save more. Upgrade today!

Get our Annual Premium Membership at our best savings yet.

Upgrade to our Annual Premium Membership today and get even more value from your lynda.com subscription:

“In a way, I feel like you are rooting for me. Like you are really invested in my experience, and want me to get as much out of these courses as possible this is the best place to start on your journey to learning new material.”— Nadine H.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.