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Line 10 is the PL/SQL keyword NULL followed by a single-line comment. NULL in this context means no operation. I put it there because every PL/SQL block must have at least one line of code, or it won t compile. Line 11 starts the exception-handling section with the keyword EXCEPTION. If you code an exception-handling section, you must catch at least one exception. In this case, I ve coded a NO_DATA_FOUND exception, which will raise an application error with my message should a NO_DATA_FOUND exception occur. Line 15 ends the PL/SQL block or program with keyword END. Line 16 has a single forward slash (/), which is a signal to SQL*Plus to execute the PL/SQL block. In this case that is, with an anonymous PL/SQL block the Oracle database will compile and then run the code in the PL/SQL block. Line 17 is another single-line comment that, too, exists outside the PL/SQL block.

Microsoft Silverlight provides a highly interactive, web-based user interface. The Silverlight web resource allows you to upload Silverlight files (.xap) directly to Microsoft Dynamics CRM. Figure 11-1 provided an example of Silverlight displayed in Microsoft Dynamics CRM. The Silverlight web resource contains the same properties as the Web Page web resource. Please refer to Table 11-3 or the Microsoft Dynamics CRM SDK for more details. Silverlight development is beyond the scope of this book. The Microsoft Dynamics CRM SDK provides some additional examples and considerations when developing Silverlight controls in Microsoft Dynamics CRM.

Now it s time for you to execute an anonymous PL/SQL block/program. 1. Open SQL*Plus and connect to the database. 2. At the SQL> prompt, type the following: set serveroutput on size 1000000 begin SYS.DBMS_OUTPUT.put_line('Hi there genius!'); end; / After you typed the forward slash on a line by itself, you will have executed your very first PL/SQL procedure, and a very complimentary one at that. The first line tells SQL*Plus to echo the database s output for your session to the screen after the PL/SQL procedure is finished executing: set serveroutput on size 1000000 It is a SQL*Plus command and is not part of the anonymous block. The line that starts with begin starts your PL/SQL procedure s executable code section. The next line calls the put_line procedure in package (library of stored procedures) DBMS_OUTPUT, owned by user SYS: SYS.DBMS_OUTPUT.put_line('Hi there genius!'); put_line stores your text in a buffer until the PL/SQL procedure ends. Then SQL*Plus displays the text from that buffer on the screen for you to see. The fourth line, which starts with end, ends the anonymous PL/SQL procedure. Finally, as stated earlier, the forward slash (/) on a line by itself tells SQL*Plus to execute the procedure.

In this section, we ll step through a few examples to demonstrate the power of web resources when extending your Microsoft Dynamics CRM system. However, the coding specifics are beyond the scope of this book. Please consult the Microsoft Dynamics CRM SDK or alternate

CHAPTER 2 PL/SQL IS S QUA RE, M AN!

programming resources for more in-depth coverage of the code. Instead, we will focus our attention on applying the code as web resources. Let s consider the following examples of how web resources can be used:

In this example, you didn t code declaration or exception-handling sections, but they re still there! If an error occurs between the BEGIN and END keywords, PL/SQL will use the default (invisible) exception handler to raise the error to the enclosing program unit, which, in this case, is SQL*Plus.

Polymorphism is the ability of objects based on different classes to respond to the same method call using their own unique method implementation. This simplifies client code because the client code does not need to worry about which class type it is referencing, as long as the class types implement the same method interfaces. For example, suppose you want all account classes to contain a GetAccountInfo method with the same interface definition but different implementations based on account type. Client code could loop through a collection of account-type classes, and the compiler would determine at runtime which specific account-type implementation needs to be executed. If you later added a new account type that implements the GetAccountInfo method, you would not need to alter the existing client code.

Formatting and translating U.S. phone numbers Updating a form based on a field value Filtering options based on the selection of a field value Displaying customer information on an opportunity form