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PART III
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Figure 20-6 Choose a query type
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Figure 20-7 Generate your SQL statements
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For the purposes of this example, turn off the automatic generation of SQL statements offered in the Advanced options by unchecking the Generate Insert, Update, and Delete Statements check box If you select the Query Builder, the Add Table dialog box opens (see Figure 20-9), displaying a list of the tables contained in the database that was specified in the Data Link Properties dialog box Select the tables you wish to add (for this example, choose the Student table), and the Query Builder will provide you with a graphical interface for completing your SQL statements, as shown in Figure 20-10 The tables you add can then be used in any query string that you build through the Query Builder
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Figure 20-8 The advanced options
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20: Data in Windows Forms
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Figure 20-9 The Add Table dialog box
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PART III
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Figure 20-10
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The Query Builder
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Notice in Figure 20-10 that the Student table columns are listed in the top pane, and you can choose to use all the columns or just specific columns from that pane by checking the appropriate check boxes When you make your choices (for this example, choose Student#, FirstName, LastName, and Program#), the SQL statement in the third pane down reflects your choice, and in this case displays the following statement:
SELECT Student#, FirstName, LastName, Program# FROM Student
You can also specify the sort order and selection criteria in the second pane To test the command, right-click in the bottom pane and select Run The command will be run against the connection to the database, and the results will be shown in the bottom pane In this example (shown in Figure 20-10), we have asked that LastName be sorted ascending, then FirstName sorted within LastName We also specified that the FirstName must be equal to Jim As you can see in the figure, this command returned only one record where the first name is Jim The corresponding SQL statement has been generated for us:
SELECT Student#, FirstName, LastName, Program# FROM Student WHERE (FirstName = 'Jim') ORDER BY LastName, FirstName
Once you have tested the command, click OK in the Query Builder, and click Next in the Data Adapter Configuration Wizard The wizard then uses the information that you provided to generate the desired command and connection statements You will be shown a window that verifies the success or failure of the exercise (see Figure 20-11) When you are satisfied with the results, click Finish You will be returned to your form Notice in Figure 20-12 that the form now has two objects associated with it sqlDataAdapter1 and sqlConnection1
Figure 20-11 Configuration Wizard results
20: Data in Windows Forms
PART III
Figure 20-12
The form with the data adapter and connection
You have now created two objects that represent the execution instructions and the physical connection to the data store The next step is to create an object that will represent the data a DataSet There are two ways to accomplish this: Select Data | Generate Dataset from the menus Right-click on the sqlDataAdapter1 object and select Generate Dataset In either case the Generate Dataset dialog box will be displayed (see Figure 20-13) You can select either an existing dataset or create a new object For this example, choose a new DataSet object and call it dsStudent to represent the table from which the data is retrieved The new DataSet object (dsStudent1) is created and added to the form along with the DataAdapter and Connection objects (at the bottom of the screen) EXAM TIP To summarize, you use an xxxDataAdapter (where xxx represents SQL or OLE), which encapsulates Connection, Command, and DataReader objects in order to populate a DataSet The DataSet is then used to represent the rows and columns (or a table) from the database Using the DataAdapter, you can update the data source through the DataSet
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Figure 20-13 Creating a new DataSet object
Using the DataGrid
Now that you have a DataSet, you ll need to display the data on your form To do this, we ll start with a control that is built to display rows and columns of data the DataGrid From the Toolbox, select the DataGrid and drag it onto the form Figure 20-14 shows a runtime DataGrid control filled with data Although you do not need to be aware of the power of the DataGrid control for the Microsoft exams, you should take some time to explore its properties, methods, and events in order to fully appreciate it NOTE Your output may not look exactly like Figure 20-14 As a matter of fact, unless you have read ahead, you will notice that you have no data from the database displayed You must manually put data into the DataSet using the Fill method of the DataAdapter We will cover this in the next section
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