The Dallas/Ft. Worth ColdFusion User Group has been working through the book Head First Design Patterns, taking the Java-centric code examples in the chapters and implementing them in ColdFusion to see how they may apply to us as ColdFusion developers. Click here for a continually updated list of presentations.
Keep updated with ColdFusion in the DFW area by following @dfwcfug on Twitter.
Tonight at the Dallas/Fort Worth ColdFusion User Group meeting, I'll be continuing our series on design patterns with a presentation on The Template Pattern. The meeting will be begin at 6:30 with a training topic. The main presentation will be presented using Adobe Connect, so you can join us live or view the recording later. Keep updated with ColdFusion in the DFW area by following @dfwcfug on Twitter.
Justin Treher asks: "Yo, Adrian. I see that you are using autonumber for your tables. Whenever you run the CREATE method in the DAO you are just returning true. How does the application get the ID?"
I've had a lot of feedback on both the OOP and Mach-II series via e-mail, through comments and in person. Many people have said they've been trying to learn these concepts that "all the blogs talk about", that there aren't many resources out there and that my series has been easy to understand. Hopefully, and with some help, I can write a book that's easy to understand as well.
We recently* discussed how use a DAO to map a single record from a single database table to a Bean Object under a one to many relationship. Now we need to discuss how to use a DAO to populate a Bean with data from multiple tables under a many to many relationship.
A reader of my OOCF Primer asks: "Instead of having multiple cfc's can one have just 1 cfc?" The answer is: it depends.
We've seen how to convert data list and data detail pages from procedural code to Mach-II events. Now we need to refactor how we build form and action pages.
We last discussed how to manage recordsets with Mach-II. Now it's (finally) time to discuss how to work with individual records using Beans and Data Access Objects (DAOs).
Ok, so we've got the concept of a DAO and how it interacts with a bean. Here's an example of a form and an action page using Object Oriented Coldfusion.
As discussed part 6, a bean encapsulates a single record of data and that data doesn't necessarily have to come from a single database table. But in this example, it does.
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