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Another wrinkle occurs with view state (discussed in 9) and forms authentication ( 18) The problem in both cases is the same ASPNET encodes some information to prevent tampering and verifies the information later For example, with view state, ASPNET adds a hash code, which double-checks the next time the page is posted back to make sure the user hasn t changed the hidden view state field (in which case the request is rejected) The problem that can happen with web farms is that the hash code one web server creates might.

The data model designer is pretty slick, but to actually use your data model, you need the help of some behind-the-scenes code. Like the data model XML, this code is long and tedious, so you won t want to read it through from start to finish. However, you ll have a better understanding about how your application works if you review its basic design and organization. All the data model code is contained in a .Designer.cs file in the App_Code folder. (In the current example, it s Northwind.Designer.cs.) All the code is placed in a namespace that has the name of your data model, plus the word Model, as in NorthwindModel. If you look through the code, you ll make a few observations immediately. First, you ll notice that there are attributes (bits of descriptive information in square brackets) scattered throughout. These attributes connect various pieces of code to the back-end database they represent. For example, consider this attribute: [EdmEntityTypeAttribute(NamespaceName="NorthwindModel", Name="Employee")] It connects the following Employee class to the Employee table in the data model. Although attributes like these are critically important to the functioning of the Entity Framework, you don t need to pay any attention to them yourself. The next design detail you ll notice is that the code is split into two regions: entities and contexts. Regions are simply an organization feature that lets you temporarily collapse blocks of code out of sight. However, the regions in the data model underscore the two types of classes that the Entity Framework uses.

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Running the code in Listing 9-9 results in the following notice: Notice: serialize(): "baseVar" returned as member variable from __sleep() but does not exist O:8:"Extender":2:{s:21:"ExtenderextenderVar";s:3:"bar"; s:7:"baseVar";N;} To solve this problem and properly serialize the baseVar member, you need to use SPL s Serializable interface. The interface is simple, as shown in Listing 9-10. Listing 9-10. The Serializable Interface interface Serializable { public function serialize(); public function unserialize( $serialized ); } The serialize() method, when you implement it, requires that you return the serialized string representing the object; this is usually provided by using the serialize() function. The unserialize() function will allow you to reconstruct the object. It takes the serialized string as an input. Listing 9-11 shows the serialization of a private member of a base class. Listing 9-11. Serializing a Private Member in a Base Class error_reporting(E_ALL); class Base implements Serializable { private $baseVar; public function __construct() { $this->baseVar = 'foo'; } public function serialize() { return serialize($this->baseVar); } public function unserialize($serialized) { $this->baseVar = unserialize($serialized); } public function printMe() { echo $this->baseVar . "\n"; } }

The entities are the data objects classes that represent the records from your database. The Entity Framework uses a separate entity class for each table, and in the Northwind database example you ll have classes like these: Customer, Product, Order, Order_Detail, Employee, Shipper, Region, and so on. They all derive from a base class called EntityObject, which gives them support for change tracking and other Entity Framework features. As you saw in the data model, each entity class has the same basic structure. It consists of data properties (also known as primitive properties) that correspond to fields and navigation properties that let you find related data. For example, the Employee class has data properties such as FirstName, LastName, and EmployeeID. It also navigation properties like Orders and Territories. If you dig deeper into the property procedure code, you ll find quite a bit of boilerplate code for tracking changes, raising events, and communicating with the inner mechanics of the Entity Framework. Finally, each entity class also includes a static factory method that lets you create a new, completely and correctly initialized entity object. For example, you can call Employee.CreateEmployee() and pass in the appropriate parameters to create a new employee object, as you ll see shortly.

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