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Chapter 12: ADO.NET: Hello Database 2953. When the dialog box appears, click the Add button to select the Supporters table forquery practice. Once you have done so, you will see the Query editor as shown inFigure 12-9.4. Click the LastName, Donation, and DateLastContact fields in the Supporterscheckbox window in the top panel.5. In the middle panel, in the Filter column of the Donation record, type in >200.When you do, you will see a set of SQL commands below the table:SELECT LastName,Donation,DateLastContactFROM SupportersWHERE (Donation > 200Figure 12-9 Working with a table query
296ASP.NET 3.5: A Beginner’s GuideThat SQL query is the sequence you would use in a C# statement to make a databasequery to the Supporters table.6. Finally, place the mouse anywhere on the Query editor and right-click it. Select ExecuteQuery. At the bottom panel, you should see the output from your table as shown inFigure 12-9.At this point you have a database, a table, and data with which to practice queries. Usingthe commands from Chapter 11, you should be able to use this to practice SQL queries. Youmight want to take a look at a good introduction to databases if you’re not familiar withthem. Databases Demystified by Andrew Oppel (McGraw-Hill, 2004) is a good jumping-offpoint. The next step is to get these commands arranged in a web site for real-world use.Creating Web Sites for Database UseNow that the table in the database is ready for use, we need to examine how to use ASP.NETand C# to work with ADO.NET in an application. Using a SQL server, you will find that thekey SQL commands begin with—what else?—Sql. In this section we will examine what youneed to connect to a database, to make a query, and to output the data to the screen.NOTEIf you are working with Microsoft Access or with an Oracle database, you can use anOdbcConnection (Oracle) or OleDbConnection (Access) connection. Those mustbe set up by importing the System.Data.Odbc (Oracle) or System.Data.OleDb(Access) namespaces. Everything works very much like the SqlConnection as far asconnecting to the database is concerned.First Use the SqlClient NamespaceWhen you’re ready to launch your database application, the first thing you need to rememberis to import the SqlClient namespace. You set it up as a property of System.Dataas follows:using System.Data.SqlClient;It’s easy to forget, but in this section and the remainder of the chapter, you’ll be using itfor all of the different Sql... commands that you need to use.TIPThe process in setting up a database is a one-time operation. Because of that, you’reapt to forget the name of the database. Write it down and store it at someplace you canremember on your computer. This is vital if you create a database outside of Visual Studio2008 that kindly stores the name of the database and related tables in the Server Explorer.
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ASP.NET 3.5A Beginner’s Guide
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This book is dedicated to Ricky, Ol
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Contents at a GlancePART I Getting
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For more information about this tit
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Contents xiUsing HTML Forms Interac
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Contents xiiiCREATE: The SQL Comman
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Contents xv17 ASP.NET Ajax . . . .
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AcknowledgmentsThis book was greatl
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IntroductionWhat distinguishes the
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Introduction xxiWhat This Book Cove
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Introduction xxiiiChapter 7: CSS fo
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Chapter 17: ASP.NET Ajax One of the
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Part IGetting StartedCopyright © 2
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Chapter 1Introduction toASP.NET 3.5
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Chapter 1: Introduction to ASP.NET
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Chapter 4Doing More withC# and ASP.
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Part IIForms and ControlsCopyright
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Chapter 14LINQCopyright © 2009 by
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Chapter 14: LINQ 365As you can see,
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Chapter 16SecurityCopyright © 2009
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Chapter 16: Security 391certain peo
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Chapter 17ASP.NET AjaxCopyright ©
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Chapter 17: ASP.NET Ajax 439Summary
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Index< > (arrow brackets), 36Aacces
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Index 443ConVarASP.NET, 55C#, 56coo
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Index 445IntelliSense, 27and events
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Index 447StreamReader, 381StreamWri
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