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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Now this UDF can be used within a T-SQL query in a variety of ways. For example, the following query displays the full names of each row in the Contact table: SELECT dbo.GetFullName(Title, FirstName, MiddleName, LastName) As FullName FROM Person.Contact One of the disadvantages of a UDF is that it can return only a single scalar value. However, you can create another type of function, called a table-valued function (TVF) that returns a result set. Again, this is similar to the functionality of a stored procedure except that a TVF can be used within a query. Specifically, TVFs are typically found in the FROM clause of a SELECT query. User-Defined Aggregates For years, database developers have requested the ability to extend the set of built-in functions like COUNT, SUM, AVG, etc. with their own custom functions. Finally, you can now do exactly that by implementing a user-defined aggregate (UDA). UDAs are similar to UDFs, except that they are designed to compute a single value by operating on a given column over a set of rows. Typically, you can also implement UDA functionality as a stored procedure or a UDF. The benefit of the UDA approach, however, is that you can use it in your queries like any of the built in aggregate functions. It will also perform better in most cases. User-Defined Types SQL Server 2005 s new user-defined type (UDT) feature enables you to extend the SQL Server type system with your own custom scalar types. You simply define a custom type as a managed class and encapsulate all required data and behaviors within that class. Once the type is completed and deployed, you can use it just like any other SQL Server data type to define columns, declare variables, etc. It is important to note, however, that this feature is not intended as a mechanism to turn SQL Server into an object-oriented database. This feature is meant for small and simple types only. If you attempt to use more complex types, you will soon run into the 8KB column size limit or various indexing restrictions. Therefore, complex business objects such as Customer, Product, Order, etc. are poor candidates for UDTs. On the other hand, a good example of where a UDT might be useful is if you have tables that use a custom date structure. With a UDT, you can encapsulate that custom date structure and its behaviors into a custom type.
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SQL Server 2005 Service Broker
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Service Broker is an enterprise-ready message queuing infrastructure that is fully integrated with the SQL Server 2005 data engine. This presents a radically different approach from the norm where products such as Message Queuing (MSMQ) provide this capability. In turn, this inevitably fosters many good questions: Why do you need messaging in the database What are the scenarios where you would use this How is this different from MSMQ How do you choose between Service Broker and other messaging technologies such as MSMQ, Web Services, and BizTalk In this section, we address these questions, but let s begin by answering a more fundamental question. . .
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Why Message Queuing
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Message queuing has long been a staple of highly scalable and robust systems. It is particularly useful for systems that must integrate disparate applications running on many different platforms, but its flexibility makes it an appealing solution for a wide variety of system scenarios where tasks must be executed asynchronously, correctly, and robustly. So why aren t all distributed architectures based on messaging Because building a messaging infrastructure with enterprise-level features is not a trivial task. In fact, it s plain hard. Messaging products such as MSMQ alleviate the implementation pain, but bring additional costs in terms of administration idiosyncrasies and mastering yet another fairly complex API. For many developers and architects building a small- to medium-sized system, these costs discourage the use of MSMQ and, thus, messaging in general (see 8 for a discussion and examples of MSMQ). On the other hand, the industry is clearly shifting away from the Remote Procedure Call (RPC) and distributed object mindset in favor of messaging. A number of new and forthcoming technologies are enabling this shift by making message-based implementations more palatable in more scenarios. Web Services, BizTalk, and Windows Communication Foundation all treat a message as a first-class citizen rather than a network protocol detail to be abstracted into a method call. And now you can also add SQL Server 2005 s new Service Broker feature to this ever-growing list of messaging tools.
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