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The Data web resource type (also known as an XML web resource) acts as the primary option to save and access data in XML format. This option is typically used to manage static data fields, such as configuration settings. You must use an .xml file extension when creating your web resource or Microsoft Dynamics CRM won t recognize the file correctly, even if the file contains XML data. As with other resource types, you also can manually type your data using the Text Editor option on the web resource form, rather than uploading an XML file. Microsoft Dynamics CRM caches web resources, so the Data resource type is not a good storage model for frequently changing data. For frequent data updates, consider creating a custom entity to store the data instead.

Listing 2-1 is an example of an anonymous PL/SQL block. Comments describe the different sections. Listing 2-1. An Anonymous PL/SQL Block, anonymous.sql 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 -- This is an anonymous procedure, so it has no name DECLARE /* You declare local cursors, variables, and methods here, but you don't need to have a declaration section. */ BEGIN -- You write your executable code here NULL; -- Ahhh, you've got to have at least one command! EXCEPTION when NO_DATA_FOUND then raise_application_error(-20000, 'Hey, This is in the exception-handling section!'); END; / -- the forward slash on a line by itself says execute this procedure Let s go through Listing 2-1 line by line: Line 1 is a single-line comment. Single-line comments start with a double-dash (--), but line 1 is not part of the PL/SQL block or program, because it exists outside the block structure. Line 2 starts the block with the keyword DECLARE. This anonymous PL/SQL block could have started with the keyword BEGIN, because it doesn t have anything to declare. Lines 3 through 6 are a multiline comment in the declaration section. Multiline comments start with a slash and asterisk (/*) and end with an asterisk and slash (*/). Line 7 starts the PL/SQL executable section of the PL/SQL block with the keyword BEGIN. Line 8 is a single-line comment in the executable section.

The Image web resource type stores static images files that are referenced when customizing the icons of Microsoft Dynamics CRM entities or in the site map, ribbon, or custom pages. Microsoft Dynamics CRM supports the following image types: .jpg, .gif, .png, and .ico. Unlike previous versions of the software, you must use a web resource to customize the icons of an entity in Microsoft Dynamics CRM 2011. When referencing an Image web resource in an entity, the site map, or the ribbon, Microsoft Dynamics CRM creates a solution dependency to the web resource. Therefore, you must include the web resource in your solution before importing it into a new environment.

Public Interface IAccount Function GetAccountInfo() As String End Interface A class implements the interface by using the Implements keyword. When a class implements an interface, it must provide implementation code for all methods defined by the interface. The following code demonstrates how a CheckingAccount class and a SavingsAccount class implement the IAccount interface. Notice that the keyword Implements indicates the class implements the interface, and it is also used to indicate when a method of the class is implementing a method of the interface: Public Class CheckingAccount Implements IAccount Public Function GetAccountInfo() As String _ Implements IAccount.getAccountInfo Return "Printing Checking Account Info" End Function End Class Public Class SavingsAccount Implements IAccount Public Function GetAccountInfo() As String _ Implements IAccount.getAccountInfo Return "Printing Savings Account Info" End Function End Class Because implementing an interface and inheriting from an abstract base class are similar, you might ask why you should bother using an interface. The main advantage of using interfaces is that a class can implement multiple interfaces. The .NET Framework does not support inheritance from more than one class. As a workaround to multiple inheritance, the ability to implement multiple interfaces was introduced. Another advantage to implementing interfaces is that at compile-time, clients can instantiate an object instance based on an interface. During runtime, any object of a class type that implements the interface can be used. This is the basis for a type of polymorphism, which is discussed in the next section.

CHAPTER 2 PL/SQL IS SQUA RE, MA N!

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