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Figure 1-4. The five logical layers with separate application and database servers Putting the Data Access layer on the application server centralizes all access to the database on a single machine. In .NET, if the connections to the database for all users are made using the same user ID and password, you ll get the benefits of connection pooling for all your users. What this means immediately is that there will be far fewer connections to the database than there would have been if each client machine had connected directly. The actual reduction depends on the specific application, but often it means supporting 150 to 200 concurrent users with just two or three database connections. Of course, all user requests now go across an extra network hop, thereby causing increased latency (and therefore decreased performance). This performance cost translates into a huge scalability gain, however, because this architecture can handle many more concurrent users than a 2-tier physical configuration. With the Business layer deployed on both the client and server, the application is able to fully exploit the strengths of both machines. Validation and a lot of other business processing can run on the client workstation to provide a rich and highly interactive experience for the user, while noninteractive processes can efficiently run on the application server. If well designed, such an architecture can support thousands of concurrent users with adequate performance.

Of course, the GetValue() method returns everything as type object, so the result is casted to Csla. Core.IEditableObject in order to call the method.

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Version 1.0 of SQL Azure, which was released at PDC 2009, provides the core capabilities of SQL Server in the cloud. The first release can be likened to running an instance of SQL Server Express Edition on a shared host, with some changes to security so that you can t mess with other databases on the same server. Communication with SQL Azure is via the Tabular Data Stream (TDS) protocol, which is the same protocol that s used for the on-premises editions of SQL Server. You can connect SQL Management Studio directly to your database hosted in the cloud, as if it were hosted locally. In the first release of SQL Azure, security is limited to SQL Server user accounts. Windows Integrated Security isn t yet supported. Expect some sort of support beyond SQL Security at a later date.

As with WPF or Windows Forms applications, the best performance is received in web-based applications by minimizing the number of physical tiers. However, the trade-off in a web scenario is different: in this case, it is possible to improve performance and scalability at the same time, but at the cost of security, as I will demonstrate. To get optimal performance in a web application, it is desirable to run most of the code in a single process on a single machine, as shown in Figure 1-5.

Later on, the methods to undo or accept any changes will work the same way that is, they ll cascade the calls to any child objects. This way, all objects handle undo without breaking encapsulation.

Because you can connect to SQL Azure with a regular connection string, any existing data SQL TDS Web Worker TDS access layers continue Azure role role to work normally. Figure 1.16 shows commuTDS TDS nication between SQL TDS Azure and applications that are hosted both On-premises On-premises SQL application web server Management Studio inside and outside Windows Azure. Figure 1.16 On-premises, Azure-hosted applications and SQL If your application Management Studio communicating with SQL Azure via TDS works today using SQL Server Express Edition and doesn t use some of the more advanced features of SQL Server (see chapter 13), then your application should work in the cloud with little or no modification. Although on-premises applications can talk to SQL Azure, latency might make this a less attractive option. The closer your application is to the database, the faster it ll go. You can reduce the impact of latency by making your application less chatty.

With a regular field, the code simply stores the field value into the Hashtable object, associating that value with the combined class name and field name:

Introducing the StorageClient library and REST API Understanding how to effectively modify data Querying the Table service

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