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Protected Function GetPropertyConvert(Of F, P)(_ ByVal propertyInfo As PropertyInfo(Of F), ByRef field As F) As P Return Utilities.CoerceValue(Of P)(GetType(F), Nothing, _ GetProperty(Of F)(propertyInfo.Name, field, propertyInfo.DefaultValue, _ Security.NoAccessBehavior.SuppressException)) End Function This method delegates the task of getting the field value to the GetProperty() method you ve already seen. However, it then uses Utilities.CoerceValue() to coerce the value to the specified property type. You might wonder how this differs from just using a cast to change the value type. The CoerceValue() method attempts to perform a cast, but it s more aggressive and attempts other techniques of type conversion as well, including using .NET type converters. It also includes functionality to convert Enum types into and out of text representations. The end result is that these versions of the four property helper methods can save you a lot of code and complexity in cases where the property type and backing field type do not match.

Now that we ve seen the three approaches to encryption of data at rest, which one should you use That is another It depends answer. Each approach has advantages and disadvantages, with the manual approach having the least set of advantages.

Manual application implemented encryption would be appropriate if you simply do not have access to and will not get access to the Advanced Security Option (ASO) available with the Enterprise Edition of Oracle If you do not have ASO and you must encrypt some data in order to be compliant with a policy in your place of work, then a manual do it yourself approach is warranted Remember, however, that key management is not only hard, it s extremely hard to implement and even harder to implement thoroughly and completely You must think about many things that are not immediately intuitive.

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My first property example illustrated how to declare a property that uses a managed backing field: Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property Notice that no Private field is declared, so there s no field to pass to the GetProperty() or SetProperty() method. Behind the scenes, the field manager stores and retrieves the value from a data structure. I ll discuss the field manager in more detail later.

Given that the primary purpose of a local NTP master is other than time synchronization, consider the use of the master feature as a no-cost option, similar from a budgetary perspective to the use of public NTP servers available over the Internet.

For example, if you perform do it yourself encryption and attempt to do it transparently, how can you make sure the data values are not recorded by Oracle on disk at some stage (think temporary data, for example) Are you quite sure that Oracle will never record your value in REDO or UNDO or your TEMP tablespace at sometime This does not apply just to the Oracle RDBMS, it applies to any and every database product you use Also, what about the data as it is being transferred on the network Without ASO, you would have to worry about that data being intercepted at that time as well In addition to the key management issue, we demonstrated a rather large negative performance impact as a result of manual do it yourself encryption So, that leaves the two automatic approaches.

Column level encryption and tablespace encryption both have the key management issue solved for them via the Oracle database In that regard, they are equals; they both get the full advantage of the Oracle wallet and its set of features They differ in their implementations Column level encryption would be appropriate for data attributes such as a credit card number that is infrequently accessed, where indexing is typically not a concern, and the need to define a foreign key on the attribute is not a consideration As demonstrated, if you need to access the column frequently, the cost of encrypting that column resource-wise goes up Every time you access that attribute, a decrypt (and in the case of modification, encrypt) process will be executed The more frequently you access the column, the higher the cost of encrypting the column.

As with Private backing fields, four methods get and set managed property values while converting the value to different types. The syntax is similar to what you ve already seen: Private Shared CategoryProperty As PropertyInfo(Of CategoryEnum) = _ RegisterProperty(New PropertyInfo(Of CategoryEnum)("Category")) Public Property Category() As String Get Return GetPropertyConvert(Of CategoryEnum, String)(CategoryProperty) End Get Set(ByVal value As String) SetPropertyConvert(Of CategoryEnum, String)(CategoryProperty, value) End Set End Property Again, rather than calling GetProperty() or SetProperty(), similar methods are called such as GetPropertyConvert(). These methods take two type parameters; the first is the type of the field value, and the second is the type of the property. The GetPropertyConvert() overload looks like this:

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