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Generic types such as BindingList(Of T) are very powerful because they allow a developer to easily create a strongly typed instance of the generic type. The following defines a strongly typed collection of type String: Dim myStringList As BindingList(Of String) Similarly, the following defines a strongly typed collection of type Integer: Dim myIntList As BindingList(Of Integer) Since both myStringList and myIntList are of type BindingList(Of T), you might think they are polymorphic that you could write one method that could act on both fields. But you can t. Generic types are not inherited and thus do not come from the same type. This is highly counterintuitive at first glance but nonetheless is a fact of life when working with generic types. Since CSLA .NET makes use of generic types (BusinessBase(Of T), BusinessListBase(Of T, C), and so on), this is a problem. There are cases in which a UI developer will want to treat all business objects the same or at least be able to use the .NET type system to determine whether an object is a business object. In order to treat instances of a generic type polymorphically or to do type checks to see whether those instances come from the same type, the generic type must inherit from a non-generic base class or implement a non-generic interface. In the case of BindingList(Of T), the generic type implements IBindingList. So, both myStringList and myIntList can be treated as IBindingList types. To provide this type of polymorphic behavior to CSLA .NET business objects, all business base classes implement Csla.Core.IBusinessObject. This, then, is the ultimate base type for all business objects. Here s the code for IBusinessObject:

The last reason to avoid the manual approach is one of performance. There is a measurable overhead in application-implemented encryption. Any layer of code we as developers add between the client and the database will add some level of overhead and encryption can be a very expensive one to implement. So, let s create a package to easily encrypt/decrypt with and compare the performance of a VARCHAR2(30) string stored non-encrypted and again encrypted. We ll just compare single row INSERT performance, bulk INSERT performance, and data retrieval (SELECT) performance. To begin with, we ll need a package to perform the encryption operations for us, a sample package specification that would just contain two entry points, one to encrypt and the other to decrypt: ops$tkyte%ORA11GR2> create 2 as 3 function encrypt( 4 5 return raw; 6 7 function decrypt( 8 9 return varchar2; or replace package encryption_wrapper p_string in varchar2, p_key in varchar2 ) p_raw in raw, p_key in varchar2 )

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10 end; 11 / Package created. For our package body, an implementation might start off like this: ops$tkyte%ORA11GR2> create or replace package body encryption_wrapper 2 as 3 g_encrypt_typ constant PLS_INTEGER default 4 DBMS_CRYPTO.ENCRYPT_AES256 5 + DBMS_CRYPTO.CHAIN_CBC 6 + DBMS_CRYPTO.PAD_PKCS5; 7 8 function padkey( p_key in varchar2 ) return raw 9 is 10 begin 11 return utl_raw.cast_to_raw(rpad(p_key,32)); 12 end;

The global variable G_ENCRYPT_TYP specifies the type of encryption we want; this would be implementation dependent (that is, something you would figure out). Here, I m going with a standard AES with a 256-bit (32 byte) encryption key. I ve added a convenience function PADKEY to convert a character string key into a RAW and ensure it is 32 bytes long. Next is our implementation of the ENCRYPT function. It will begin by converting our string into a RAW type using a safe character set. Then it will invoke DBMS_CRYPTO to actually encrypt the string (which is now a RAW) and return the value: 14 15 16 17 18 19 20 21 22 23 function encrypt( p_string in varchar2, p_key in varchar2 ) return raw is begin return DBMS_CRYPTO.ENCRYPT ( src => UTL_I18N.STRING_TO_RAW (p_string, typ => g_encrypt_typ, key => padkey( p_key ) ); end;

Namespace Csla.Core Public Interface IBusinessObject End Interface End Namespace Notice that this interface has no members (methods, properties, and so on). This is because there are no common behaviors across both read-only and editable business objects. The interface remains useful, however, because it allows code to easily detect whether an object is a business object through code like this: If TypeOf theObject Is Csla.Core.IBusinessObject Then ' theObject is a business object End If The next couple of interfaces will have more members.

'AL32UTF8'),

Lastly, we implement the DECRYPT routine. This simply decrypts our RAW encrypted data using the same key and then returns the VARCHAR2 representation of that output: 24 25 26 27 28 29 function decrypt( p_raw in raw, p_key in varchar2 ) return varchar2 is begin

The final common interface is ICommandObject. Like IBusinessObject, this is an empty interface: Interface ICommandObject Inherits IBusinessObject End Interface Again, you can use this interface to easily determine whether a business object inherits from CommandBase within your business or UI code.

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