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that are virtual. Virtual methods do not have an implementation in the virtual object. Virtual objects exist so that they can be inherited from and they often play an important role in complex object designs.

s Note You can use other options to create your HTML. For example, you can use Markaby to create the

So where does Ajax fit into this grandiose scheme of things Can we really implement something as dynamic into a structured environment Let s first take what we ve discussed about Ajax communication so far and how we can slot it into our diagram We know that our user interface will be communicating via XmlHttpRequest coding And we re relatively sure that our Ajax library will provide us with an interface appropriate for such communication So let s plug that into a revised edition of our previous n-tier structure, shown in Figure 4-5 We must make a conscious decision that, if we really are going to implement n-tier, Ajax must adhere to the same constraints that we would generally apply to other levels of coding Our Ajax library should bear the burden of communicating with the business layer for all of the dynamic interface requests.

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Although OCaml has a random number library called Random, sometimes I want the initialization of the random number generator to be more automatic than it is with the library.

output. Markaby uses Ruby methods to represent HTML elements. 7 includes an example of using Markaby. Of course, you may find that entering HTML directly in your code is easier to understand.

I ve seen various sample applications where the developer makes database calls from the tail end of the Ajax request There isn t anything inherently wrong with that, aside from the fact that it deviates from proper n-tier architecture With n-tier, I ve found that it is an all-or-none proposition Imagine that you slacked off on a particular business object and dropped some SQL code in there A few months go by and the DBA calls and says that the company just got a great deal on Oracle and that the migration will begin soon You modify the data layer and fire up the application only to find that some of the pages aren t loading correctly Unfortunately, the cut corners are now starting to compound the problem exponentially Sticking to the playbook will ultimately pay off in time saved and ease of maintainability.

s What is the difference between classes and objects A desk is a class of object. The desk you are Tip

The single variable you pass to your view is an array of users. You pass it to your eruby_object variable, and it becomes a class variable @users for your view, in the same way that Rails views work. The users variable is created by using the User.find method to loop through all of your users. You add a not is_admin condition, which means that only non-admin users will be included in your report. (This is assuming that admin users are used to administrate the system and not to do sales work; if that s not true, you can easily remove this condition.) The order is set through the option :order=>'last_name ASC, first_name ASC', which means that you sort first by the last name, and second by the first name, both in alphabetic, A Z order. The second sort order kicks in only if two people have the same last name. If you replaced ASC with DESC, it would sort in Z A order. Let s take a look at the actual view (Listing 8-3):

sitting in front of is an instance of the desk class. It is the instance of a desk that is actually an object.

All of this theory looks really awesome on paper, but it is better demonstrated The sample application for this chapter illustrates the basics tenets of n-tier and Ajax We ll take a look at a possible website file structure that will help to segregate the tiers appropriately..

<html> <body> <h1>Salesperson Reward Report</h1> <table> <tr> <th>Name</th> <th>Meetings</th> <th>Reward</th> </tr>

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