ObjectAdapter in VB.NET

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Many reporting technologies, such as Crystal Reports, don t offer the ability to generate a report directly against objects. Unfortunately, these technologies are designed to only generate reports directly against a database or DataSet; yet many applications need to generate reports against business objects, leaving the developer in a difficult position. The ObjectAdapter implements a Fill() method that copies data from an object or a collection of objects into a DataTable or a DataSet. The resulting DataSet can then be used as a data source for reporting technologies that can t run directly against objects. While not useful for large sets of data, this technology can be very useful for generating small printouts against small amounts of data. For a more complete discussion of ObjectAdapter and reporting with objects, see 5.
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In 10, you will see how to implement an ASP.NET Web Forms UI on top of business objects. This chapter will make use of the new data binding capabilities in Web Forms 2.0. In this technology, the Insert and Update operations provide the data from the form in IDictionary objects
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CHAPTER 2 s FRAMEWORK DESIGN
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(name/value pairs). The values in these name/value pairs must be loaded into corresponding properties in the business object. You end up writing code much like this: cust.Name = e.Values("Name").ToString cust.Address1 = e.Values("Address1").ToString cust.City = e.Values("City").ToString Similarly, in 11, you ll see how to implement a Web Services interface on top of business objects. When data is sent or received through a web service, it goes through a proxy object: an object with properties containing the data, but no other logic or code. Since the goal is to get the data into or out of a business object, this means copying the data from one object s properties to the other. You end up writing code much like this: cust.Name = message.Name cust.Address1 = message.Address1 cust.City = message.City In both cases, this is repetitive, boring code to write. One alternative, though it does incur a performance hit, is to use reflection to automate the copy process. This is the purpose of the DataMapper class: to automate the copying of data to reduce all those lines of code to one simple line. It is up to you whether to use DataMapper in your applications.
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Dates are a perennial development problem. Of course, there s the DateTime data type, which provides powerful support for manipulating dates, but it has no concept of an empty date. The trouble is that many applications allow the user to leave date fields empty, so you need to deal with the concept of an empty date within the application. On top of this, date formatting is problematic rather, formatting an ordinary date value is easy, but again you re faced with the special case whereby an empty date must be represented by an empty string value for display purposes. In fact, for the purposes of data binding, we often want any date properties on the objects to be of type String so that the user has full access to the various data formats as well as the ability to enter a blank date into the field. Dates are also a challenge when it comes to the database: the date data types in the database don t understand the concept of an empty date any more than .NET does. To resolve this, date columns in a database typically do allow null values, so a null can indicate an empty date.
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s Note Technically, this is a misuse of the null value, which is intended to differentiate between a value that was never entered and one that s empty. Unfortunately, we re typically left with no choice, because there s no way to put an empty date value into a date data type.
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You may be able to use Nullable(Of DateTime) as a workable data type for your date values. But even that isn t always perfect, because Nullable(Of DateTime) doesn t offer specialized formatting and parsing capabilities for working with dates. Nor does it really understand the concept of an empty date: it isn t possible to compare actual dates with empty dates, yet that is often a business requirement. The SmartDate type is an attempt to resolve this issue. Repeating the problem with SqlDataReader, the DateTime data type isn t inheritable, so SmartDate can t just subclass DateTime to create a more powerful data type. Instead, it uses containment and delegation to create a new type that provides the capabilities of the DateTime data type while also supporting the concept of an empty date.
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