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The College Application
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Our college application was developed in the last two chapters and will be expanded to include a visual presentation of the data found in our database Figure 20-1 shows the schematic of the College database, which includes three tables Student, Program, and Course The Student table includes information about the students in our sample college, including the program in which they are enrolled The program is linked to the Program table for a description and to the Course table for the list of courses that a student must take to complete the program Using this simple database, we will be able to demonstrate the capabilities of data access, along with some relational aspects
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Figure 20-1
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The College database
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At the end of this chapter, you will have a workable model of this application using programmatic access to data However, for the purposes of this section of the chapter, we will deal with the built-in controls that provide wizard-like assistance when connecting to the database and presenting the resulting data You should keep in mind that, while this technique is quite powerful and certainly reduces the amount of time necessary to build easy applications, a lot of data-driven applications are created by coding the data access directly, without the benefit of prebuilt controls or visual components In the Accessing Data Programmatically section of this chapter, we will work with the classes in ADONET programmatically and bind the controls on our Windows Form to data
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Let s start by examining the Toolbox in Visual Studio NET You will notice in Figure 20-2 that there are many different objects that will provide assistance when retrieving data from a data source In order to get access to this Toolbox, click on the Data tab
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Figure 20-2 The ADONET Toolbox
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20: Data in Windows Forms
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Double-click on the SqlDataAdapter, which opens the Data Adapter Configuration Wizard You will be presented with the Welcome screen, which is the first page of the wizard The wizard allows you to graphically specify the connection information database server, database name, authentication data, and so on You start by selecting either a preconfigured or new connection as shown in Figure 20-3 For this example, click the New Connection button The next wizard screen asks you to configure the data link properties (see Figure 20-4) Select the appropriate server name from the drop-down list, provide the needed logon credentials, and choose the database from the list Notice that the database list will not appear if either the server or the credentials are incorrect TIP Be sure to test the connection The wizard provides you with a Test Connection button that will ensure that a connection can be made to the database server You also have an opportunity to change the provider using the Provider tab of the Data Link Properties window (see Figure 20-5) Take a moment to investigate the different data providers offered by default within Visual Studio NET Should you have need of any other data providers, you will have to download it from either Microsoft s web site or the vendor s web site
PART III
Figure 20-3 Choose your data connection
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Figure 20-4 Set the data link properties
Figure 20-5 Set a data provider
20: Data in Windows Forms
Once you have finished setting the data link properties, click Next in the Provider tab The Choose a Query Type wizard window will be displayed (see Figure 20-6) You can choose from the following options: Use SQL statements These are SQL statements that you code yourself, and they could be SELECT, UPDATE, DELETE, or INSERT statements Create new stored procedures procedures This lets you create your own stored
Use existing stored procedures This allows you to use stored procedures that already reside on the database server For this example, choose to use your own SQL statements Click the Next button, and the wizard will ask you to type in the SQL statement (see Figure 20-7) You have three choices when presented with this wizard window: Simply type your SQL statement in the box provided Use the Query Builder which is a wizard-like interface for SQL assistance Go to the Advanced Options (see Figure 20-8) to have UPDATE, DELETE, and INSERT statements automatically generated, based on your SELECT statement EXAM TIP You should be very comfortable with the standard SQL statements Review 10 for SELECT, UPDATE, DELETE, and INSERT statements
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