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Public Class Product Private _name As String Private _price As Decimal Private _imageUrl As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Public Property Price() As Decimal Get Return _price End Get Set(ByVal value As Decimal) _price = value End Set End Property Public Property ImageUrl() As String Get Return _imageUrl End Get Set(ByVal value As String) _imageUrl = value End Set End Property End Class Property accessors, like any other public piece of a class, should start with an initial capital. Usually, the private variable will have a similar name, but prefixed with an underscore (as in the previous code example), or the m_ prefix (which means member variable ). Although it s technically possible, it s not recommended to use the same name for a property as for a private variable, because it s too easy to make a mistake and refer to one when you want the other. The client can now create and configure an instance of the class by using its properties and the familiar dot syntax. For example, if the object variable is named saleProduct, you can set the product name using the saleProduct.Name property. Here s an example: Dim saleProduct As New Product() saleProduct.Name = "Kitchen Garbage" saleProduct.Price = 49.99D saleProduct.ImageUrl = "http://mysite/garbage.png"

Each of these functions may be called by the model as both the DataSource and the model work together. Even though the functions listed on lines 16 30 of Listing 14-3 don t yet contain any logic or parameters, their being entered in the DataSource keeps the model from calling a function that doesn t exist. True, when the model calls read() or query(), for instance, it will receive a null response, but this at least won t potentially result in a Warning: Function does not exist error. Later, you ll extend these skeleton functions as needed. Two functions, however, not only are present as part of the skeleton but are key for the DataSource to work at all: __construct() and __destruct(). These functions are written in Listing 14-3 as lines 5 14. More could be included in them, but for the moment they contain the very basics for the DataSource to work. When the DataSource object is instantiated, Cake needs to pass along parameters from app/config/database.php to the object. In a sense, Cake binds the DataSource through the __construct() function and the $config

Note Visual Basic treats all literal decimal values (hard-coded numbers such as 49.99) as the Double data

type. In the preceding code, this doesn t cause a problem because Visual Basic is able to seamlessly convert a Double into a Decimal, which is the required data type for the Product.Price property. However, if you ve switched on Option Strict, this implicit conversion isn t allowed, so you need to replace 49.99 with 49.99D. The D character at the end of any number tells Visual Basic to interpret the number as a Decimal data type straight off.

Usually, property accessors come in pairs that is, every property has both a Get and a Set accessor. But this isn t always the case. You can create properties that can be read but not set (which are called read-only properties), and properties that can be set but not retrieved (called write-only). All you need to do is include either the ReadOnly or the WriteOnly keyword in the property declaration, and then leave out whichever part of the property you don t need. Here s an example: Public ReadOnly Property Price() As Decimal Get Return _price End Get End Property This technique is particularly handy if you want to create properties that don t correspond directly to a private member variable. For example, you might want to use properties that represent calculated values, or properties that are based on other properties.

Listing 13-2 shows the basic file structure inside the plugin s root directory. The naming convention for plugin elements is slightly different from the standard convention for naming other Cake resources. Table 13-1 shows how to name plugin elements. Table 13-1. Naming Conventions for Plugin Elements