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Using New and Import

From: ColdFusion 9 New Features

Video: Using New and Import

There's no argument that CFCs make our development lives easier by encapsulating our code and allows us to develop rich domain models. Unfortunately, creating CFCs and dealing with pathing issues is always a pain, with long statements needed to simply create a new instance of an object. ColdFusion 9 solves this by letting us imports CFC paths into a page and use the New keyword to generate new instances of objects, instead of using the old CreateObject syntax. So in the Chapter3 folder, open up the newandimport.cfm file.

Using New and Import

There's no argument that CFCs make our development lives easier by encapsulating our code and allows us to develop rich domain models. Unfortunately, creating CFCs and dealing with pathing issues is always a pain, with long statements needed to simply create a new instance of an object. ColdFusion 9 solves this by letting us imports CFC paths into a page and use the New keyword to generate new instances of objects, instead of using the old CreateObject syntax. So in the Chapter3 folder, open up the newandimport.cfm file.

And here you can see the "old style" of instantiating an instance of an object. In this case, I am doing, cfset MyCFC = CreateObject("component", "Chapter3.cfcs.MyCFC"). And if you look here in my Chapter3 folder, I have a MyCFC.cfc. All it is does is set two properties and has an init statement that sets the default values for those properties. Now that we know all there is to know about that component, we'll go ahead and close that and I'll go ahead and run this page just to see what we get for our output.

And in this case we simply get the component with the one method defined on it. However, usually when I instantiate a CFC, I run the init method on it so I can chain the init method. We'll save that and run it, and now we can see that it's set the default properties for LASTNAME, ID, and FIRSTNAME. So the only thing I don't like about working with CFCs is this business. I end up typing CreateObject component over and over and over and over again.

Now in ColdFusion 9, you can now use the New keyword to create a new instance of an object. So I can replace this statement with this. I'll do cfset MyCFC = New Chapter3.cfcs.MyCFC, and that's it. So quite a few fewer characters. So I am going to go ahead and delete this line, save my file, and preview it. And you can see we get the exact same thing that we got with the previous code, but I didn't call the init method.

When you use the New keyword, the init method is called by default when the object is instantiated. If we don't have an init method it simply doesn't get called. So let's go back over here to the MyCFC file and just remove the init function. Save it, go back over here and reload. And you can see I just don't get my ID, FIRSTNAME, and LASTNAME, and if I add that back, refresh my page, then the init method gets called again.

That's already wonderful right there. I have I've already got rid of at least 20 characters of typing that I have to do every time that I want to instantiate a new component. But it could still be easier. We can now use the cfimport tag to specify a path that contains our CFCs. So in this case, I am going to set my path to Chapter3.cfcs.*, which means I want to import all components that are in the Chapter3.cfcs directory. Then I can simply erase this part, save my file, test.

And boom, it's exactly the same as it was before. I can even add this statement into my Application.cfc and it would filter down through my entire application. While this is easy enough, it doesn't always filter down through the entire request. So make sure that you test your applications as you are going forward to make sure that they pick up that import statement. And using custom mappings are still easier than using the cfimport syntax. But there is definitely no argument that this is a far easier way to get new objects instantiated.

So use the New keyword to quickly create new objects and get your apps built that much quicker.

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This video is part of

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ColdFusion 9 New Features

36 video lessons · 2909 viewers

Daniel Short
Author

 
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  1. 4m 30s
    1. Welcome
      53s
    2. Using the exercise files
      3m 37s
  2. 7m 48s
    1. Adding managing and comparing servers
      5m 26s
    2. Monitoring server health
      2m 22s
  3. 22m 10s
    1. Setting the default data source and SMTP
      5m 6s
    2. Getting programmatic debugging and exception handling
      5m 54s
    3. Reviewing the new onCFCRequest method
      5m 29s
    4. Using ApplicationStop()
      2m 24s
    5. Working with Server.cfc and onServerStart
      3m 17s
  4. 17m 45s
    1. Using ternary and chained operations
      5m 46s
    2. Using New and Import
      4m 2s
    3. Reviewing CFScript enhancements
      7m 57s
  5. 20m 23s
    1. Building with implicit getters and setters
      4m 26s
    2. Working with LOCAL scope in functions
      4m 35s
    3. Serializing objects
      6m 6s
    4. Writing components in CFScript
      5m 16s
  6. 19m 27s
    1. Getting started with ORM
      5m 51s
    2. Logging ORM activity
      2m 13s
    3. Saving objects to the database
      6m 10s
    4. Defining table relationships
      5m 13s
  7. 16m 59s
    1. Caching page fragments
      5m 29s
    2. Managing the cache
      4m 48s
    3. Working with in-memory files using VFS (RAM disks)
      6m 42s
  8. 12m 39s
    1. Working with Excel spreadsheets
      4m 56s
    2. Working with Word documents
      4m 4s
    3. Working with PowerPoint presentations
      3m 39s
  9. 28m 58s
    1. Loading Google maps with markers onto a page
      4m 53s
    2. Adding a Flash movie with the built-in FLV player
      2m 14s
    3. Using multi-file upload control
      6m 7s
    4. Building a progress indicator
      3m 37s
    5. Working with accordion layouts
      3m 18s
    6. Showing information with data grid enhancements
      5m 1s
    7. Informing users with Confirm Alert and Prompt dialog boxes
      3m 48s
  10. 9m 8s
    1. Accessing IMAP accounts
      6m 31s
    2. Working with the new array functions
      2m 37s
  11. 15s
    1. Goodbye
      15s

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