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Line 2 declares one parameter, aiv_number, a varchar2 value passed INto the FUNCTION Line 3 contains the RETURN clause In this case, I m returning a number Lines 4 through 8 contain a multiline comment that lists the function s source code filename, the name of the author, the date the function was written, and a description of the function s purpose So the only thing in the declaration section of this PL/SQL block is the multiline comment On line 9, the keyword BEGIN starts the execution section of the PL/SQL block On line 10, I return the built-in to_number( ) s return value for converting the varchar2 variable aiv_number to a number Then the program ends However, if the built-in to_number( ) raises an exception, the program s execution branches to the exception-handling section On line 11, the keyword EXCEPTION starts the exception-handling section of this PL/SQL block.

In addition to the Default Public View, Microsoft Dynamics CRM includes four other System-Defined Views:

On line 12, the exception handler checks to see if the raised exception is the named exception INVALID_NUMBER If it is, it executes the code that follows it on line 13 On line 13, I return NULL if there is an INVALID_NUMBER exception That s what makes this an errorless to_number( ) function If there are any other exceptions, the exception hander will raise the error to the enclosing PL/SQL block or program, which in this case, will be SQL*Plus On line 14, the keyword END denotes the end of the PL/SQL block, and hence the FUNCTION On line 15, the single slash character (/) tells SQL*Plus to execute the DDL, which stores the PL/SQL in the database and then compiles it Line 16 contains a helper SQL script that will list any compilation errors.

Similar to system entities, Microsoft Dynamics CRM automatically creates these System-Defined Views upon installation of the software. Each serves a unique purpose in the user interface, so the software constrains your ability to modify any System-Defined View. In particular, Microsoft Dynamics CRM implements a few notable customization restrictions with these views:

In this activity, you will become familiar with the following: Creating polymorphism through inheritance Creating polymorphism through interfaces

Only one of each System-Defined View can exist for an entity. You cannot delete any of the System-Defined Views.

Most of the time, this script will simply have one line of code that says show errors However, if you re compiling into another schema (other than the username you re logged in with), you may need a more complex SQL script to display errors Now let s try using this errorless FUNCTION in a SELECT statement: SQL> select to_number_or_null('A') from DUAL;.

Next, we discuss how Microsoft Dynamics CRM uses each of these views and how you can customize them. Associated View When you look at the records related to an entity, Microsoft Dynamics CRM displays the related active records using the Associated View. For example, when you

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

The following example demonstrates how to disable the phone number fields if a contact s Phone contact method is set to Do Not Allow. We ll also create a method to hide the Address section on the form if the contact s Mail contact method is set to Do Not Allow. First, create a Script web resource with the code in Listing 11-2. Note This code is located in the companion content at web resource

TO_NUMBER_OR_NULL('A') ---------------------Ta da! It returned a NULL value since the letter A is not a number. Just in case you re a skeptic, here s a second test: SQL> select to_number_or_null('234.56') from DUAL; TO_NUMBER_OR_NULL('234.56') --------------------------234.56 Yes, indeed, it works correctly!

function togglePhoneFields() { var telephone1 = Xrm.Page.ui.controls.get("telephone1"); var telephone2 = Xrm.Page.ui.controls.get("telephone2"); var mobilePhone = Xrm.Page.ui.controls.get("mobilephone"); var doNotPhone = Xrm.Page.data.entity.attributes.get("donotphone"); if (doNotPhone.getValue()) { telephone1.setDisabled(true);

Lines 250 through 256 block a call to help() and then test it in a fashion similar to the previous test. Line 258 calls test() for the package, therefore passing only the object s name. Line 259 calls procedure success(). These last two calls will indicate that the test procedure test() itself completed successfully, instead of possibly aborting somewhere in the midst of the test from an unhandled exception. Now that I ve shown you my relational testing tool, it s your turn to create an objectrelational version.

telephone2.setDisabled(true); mobilePhone.setDisabled(true); } else { telephone1.setDisabled(false); telephone2.setDisabled(false); mobilePhone.setDisabled(false); } } function toggleAddressSection() { var generalTab = Xrm.Page.ui.tabs.get(0); var addressSection = generalTab.sections.get("address"); var doNotPostalMail = Xrm.Page.data.entity.attributes.get("donotpostalmail"); if (doNotPostalMail.getValue()) { addressSection.setVisible(false); } else { addressSection.setVisible(true); } }