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large number of computer applications both desktop and web applications are data-driven. These applications are largely concerned with retrieving, displaying, and modifying data. Retrieving and processing data seems like a fairly straightforward task, but over the past decade the way applications use data has changed repeatedly. Developers have moved from simple client applications that use local databases to distributed systems that rely on centralized databases on dedicated servers. At the same time, data access technologies have evolved. If you ve worked with Microsoft languages for some time, you ve most likely heard of (and possibly used) an alphabet soup of data access technologies that includes ODBC, DAO, RDO, RDS, and ADO. The .NET Framework includes its own data access technology, ADO.NET. ADO. NET consists of managed classes that allow .NET applications to connect to data sources (usually relational databases), execute commands, and manage disconnected data. The small miracle of ADO.NET is that it allows you to write more or less the same data access code in web applications that you write for client-server desktop applications, or even single-user applications that connect to a local database. This chapter describes the architecture of ADO.NET and the ADO.NET data providers. You ll learn about ADO.NET basics such as opening a connection, executing a SQL statement or stored procedure, and retrieving the results of a query. You ll also learn how to prevent SQL injection attacks and use transactions.

Assuming the moveToPosition was successful, we are going to start all over again querying the MediaStore. This time, though, we are going to run our managedQuery on MediaStore.Audio.Media.EXTERNAL_CONTENT_URI as we want access to the individual media files. First we choose the columns that we want returned.

ASP.NET includes a new data binding framework that can hide the underlying ADO.NET plumbing in your web pages. You can skip to 9 to start learning about these features right away. However, to build truly scalable high-performance web applications, you ll need to write custom database code (and your own database components). That means you ll need a thorough understanding of the concepts presented in this chapter.

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If you re a seasoned .NET 1.x programmer, you re probably wondering what s new in the latest iteration of ADO.NET. Without a doubt, the greatest change for ASP.NET applications is the new data binding model (described in s 9 and 10). The data binding model allows you to reduce the amount of code you write for data display, and it can even allow you avoid writing any data access code at all (if you re willing to pay the price with pages that are less flexible and more difficult to optimize).

String[] columns = { MediaStore.Audio.Media.DATA, MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.MIME_TYPE, };

You can also search for nodes using the methods of the current SiteMapProvider object, which is available through the SiteMap.Provider static property. For example, the SiteMap.Provider.FindSiteMapNode() method allows you to search for a node by its URL.

Maven, as it requires write access to the home directory (~/.m2 on Unix/Mac OS X and C:\Documents and Settings\username\.m2 on Windows) and network access to download binary dependencies.

Returns the node one level up in the navigation hierarchy, which contains the current node. On the root node, this returns a null reference. Provides a collection of all the child nodes. Check the HasChildNodes property to determine if there are child nodes. Returns the previous node that s at the same level (or a null reference if no such node exists). Returns the next node that s at the same level (or a null reference if no such node exists).

To see this in action, consider the following code, which configures two labels on a page to show the heading and description information retrieved from the current node: protected void Page_Load(object sender, EventArgs e) { lblHead.Text = SiteMap.CurrentNode.Title; lblDescription.Text = SiteMap.CurrentNode.Description; } The next example is a little more ambitious. It implements the previous/next links, which allow the user to traverse an entire set of subnodes. The code checks for the existence of sibling nodes, and if there aren t any in the required position, it simply hides the links. protected void Page_Load(object sender, EventArgs e) { if (SiteMap.CurrentNode.NextSibling != null) { lnkNext.NavigateUrl = SiteMap.CurrentNode.NextSibling.Url; lnkNext.Visible = true; } else { lnkNext.Visible = false; } }

Next we need to construct an SQL WHERE clause for our query. Since we want only media files that belong to a specific album, our WHERE clause should indicate that. In normal SQL, the WHERE clause would look like this:

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