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The NET Framework data providers, sophisticated as they are (and you ll learn plenty about exploiting their sophistication later), are simply APIs for accessing data sources, most often relational databases (ADONET is essentially one big API of which data providers are a major part) Newcomers to ADONET are often understandably confused by the Microsoft documentation They read about Connection, Command, DataReader, and other ADONET objects, but they see no classes named Connection, Command, or DataReader in any of the ADONET namespaces The reason is that data provider classes implement interfaces in the SystemData namespace These interfaces define the data provider methods of the ADONET API The key concept is simple A data provider, such as SystemDataSqlClient, consists of classes whose methods provide a uniform way of accessing a specific kind of data source.

Ancillary information such as the number of rows returned, warnings and error messages, and user-supplied messages returned by a T-SQL script appears in a Messages tab This style of output is the default output mode unless you change it You can display the result set from a query statement in a text window within the Results tab In this case, there is no Messages tab because all types of output appear in the text layout within the Results tab You can send the output to a text file This is a very basic way of generating a report When the query runs with this setting, you are prompted with a dialog box for a file name in which to store the results..

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In this chapter you used three different data providers (SQL Server, OLE DB, and ODBC) to access the same SSE database The only real difference in the code was the connection string Except for choosing the appropriate data provider, the rest of the programming was effectively the same This is true of all ADONET facilities, whatever kind of data source you need to access The SQL Server data provider is optimized to access SQL Server and can t be used for any other DBMS The OLE DB data provider can access any OLE DB data source and you used it without knowing anything about OLE DB (a major study in itself) The ODBC data provider lets you use an even older data access technology, again without knowing anything about it.

Country/Region -------------United Kingdom United States United States United States United States United States

Figure 8-7. Testing the Silverlight navigation application 21. Press the View 1 HyperlinkButton at the top of the screen. The Content Frame will navigate to the View1.xaml content, as shown in Figure 8-8.

Customer Count -------------1953 71 64 3433 97 4581

Working at such an abstract level enabled you to do a lot more, a lot more quickly, than you could have otherwise ADONET isn t just an efficient data access technology but it s also an elegant one Data providers are only one aspect of it The art of ADONET programming is founded more on conceptualizing than on coding First get a clear idea of what ADONET offers, and then look for the right method in the right class to make the idea a reality..

The first sample in the preceding section illustrated how to select just those rows with column values that exceed a value returned by a subquery However, that sample code returned a constant value from the subquery for all rows in the outer query It is sometimes necessary to make the value returned by a subquery depend on one or more column values in the outer query Recall that this kind of query is often called a correlated subquery Using a correlated subquery requires the subquery to reference values from the outer query When a subquery references a value from the outer query, the subquery can use the referenced value to modify its return values The second sample in the Including a Subquery in a SELECT List section in this chapter demonstrated how to use a correlated subquery to specify a column for a result set.

Since conceptual clarity is so important, you can view (and refer to) connections, commands, data readers, and other ADO.NET components primarily as abstractions rather than merely objects used in database programs. If you concentrate on concepts, learning when and how to use relevant objects and methods will be easy.

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