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Most communication with databases happens over specialized, vendor-specific protocols Firewalls are usually configured not to let such protocols through, and with good reason: from a security perspective, making your database directly accessible on the Internet tends to look like a very bad idea Nonetheless, some people want to do this, and there are scenarios in which it s not the terrible idea it might first seem, particularly if you can exercise sufficient control over what gets exposed With WCF Data Services, you can present a relational data store over HTTP and XML or JSON You can be selective about what data you expose and to whom Moreover, the model you present doesn t necessarily have to be the same as your underlying database structure.

In fact, there doesn t have to be a database involved at all there s a provider model that enables you to present any data through this mechanism, as long as you can find a way to make it look like relational data You will normally use WCF Data Services in conjunction with the Entity Framework you can define the entities you d like to present over HTTP, and use the framework s mapping services to bridge between that and the underlying data store So we ll be looking at these services in more detail later in the chapter, once we ve finished exploring the Entity Framework The focus of WCF Data Services is different than for the other data access features we ve discussed so far it s mainly about presenting data on the network, where everything else has been about consuming data.

To make the changes permanent, you need to add these parameters in GRUB s configuration file. The file is located at /boot/grub/grub.conf. Just edit the parameter under the kernel option you need.

However, there s also a client-side component that provides LINQ-based querying for such services While it s part of the WCF Data Services technology, it s optional you re not obliged to use it on the client And this client doesn t strictly require WCF Data Services on the server the client-side parts could be used against any service that exposes data in the same way..

Silverlight uses a seriously trimmed down version of the .NET Framework to keep its download size and install time tolerably small. It doesn t have much data access support. In fact, size is not the only reason it wouldn t normally make sense for a

Silverlight client application to attempt to connect directly to a database, because Silverlight is a client-side web technology and most system administrators work to ensure that their databases are not accessible via their native protocols over the Internet. Of course, a direct connection to a database server might be an option in an intranet scenario, but it s not supported. Silverlight offers LINQ, but neither the LINQ to SQL nor the LINQ to Entity Framework providers are available, because the underlying database access mechanisms that these providers use are missing. The only supported database access mechanism in Silverlight is the WCF Data Services client.

For example, if 1 GB of RAM is not recognized by the system, you would need to add mem=1000M under the kernel parameter, as shown in Listing 3-1. You can verify whether your system is able to identify your RAM size by viewing the contents of /proc/meminfo after rebooting the system.

The full .NET Framework is designed to work with a wide range of databases. The simple ADO.NET data access we started with uses interfaces to allow database vendors to supply their own database-specific implementations. Likewise, the Entity Framework is database-agnostic it has an open provider model designed to allow support for any relational database to be added. Of course, Microsoft ships a provider for its own database, SQL Server, but other suppliers offer providers for various databases, including Oracle, MySQL, PostgreSQL, SQLite, Sybase, and DB2. In this book, we will use SQL Server. The examples work with SQL Server, which is available for free. (Some editions of Visual Studio will automatically install SQL Server 2008 Express for you by default.) The Express edition of SQL Server is the same database engine as the real versions, but with some limits on database size and with some of the more advanced features missing. Despite being a trimmed down version, it s easily capable of supporting substantial websites. It can also be used on client applications written with WPF or Windows Forms, to support client-side data stores or caching, although it can complicate the installation process for such an application installing a SQL Server instance is not a trivial task.