generate qr code in c#.net Figure 8-23 Adding new queries to a table adapter in Visual C#.NET

Making QR-Code in Visual C#.NET Figure 8-23 Adding new queries to a table adapter

Figure 8-23 Adding new queries to a table adapter
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12 Right-click the ListingTableAdapter section and select Add Query. . . as shown in Figure 8-23.
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This will bring you to the TableAdapter Query Configuration Wizard. This wizard will help you add another SELECT query that will use parameters to refine your search. You can also create a SELECT query and turn it into a stored procedure or use an existing stored procedure. As its name implies, a stored procedure is one that is stored in SQL Server and contains SQL statements, along with other programming constructs, that use a language called T-SQL or Transact-SQL. A new feature to SQL Server 2005 Express Edition is that stored procedures can also be coded in managed languages, such as C# and Visual Basic. Stored procedures are executed on the server. Since you re using SQL Server 2005 Express Edition, this will be of no concern because the SQL Server and the application are executed on the same machine.
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type of SQL query you want to use, choose SELECT which return rows and then click Next. Note that you could have added any SQL query type you wanted.
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13 Select Use SQL statements and click Next. When asked which
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your SQL statement that will perform a search for all of the listings that contain a particular color. Refer to Figure 8-24 to see the SQL command edit window. Click on the Query Builder. . . button to get a visual view of the query.
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14 You are now presented with an edit window in which to add
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be able to base your search on a particular color. To add the Color table, simply right-click in the diagram area and select Add Table. . . The Add Table dialog box appears as shown in Figure 8-25. Select the Color table and click the Add button. When the Color table has been added to the diagram, click the Close button.
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Figure 8-24 SQL command edit window ready to customize the user s search
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15 You will now add the Color table to the diagram so that you ll
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8: Managing the Data
Figure 8-25 The Add Table dialog box
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The % symbol is the wildcard in SQL and it can mean anything. For example, in the previous WHERE clause, it means return something that has a color similar to the colorname parameter.
16 In the SQL code pane of Query Builder, append the following SQL code that will help in the filtering
process:
WHERE (Color.ColorName LIKE % + @colorname + % )
give you the results you re expecting. Click the Execute Query button to display the Query Parameters dialog box, as shown in Figure 8-26.
17 Before you proceed with your new query, make sure it will
The Results pane of Query Builder should display only one row. Using the word black should return the black car row. Simply enter the letter b, and you should get both the blue and the black rows. Once you re satisfied with your query, click OK in Query Builder.
Figure 8-26 Query Parameters dialog box with prompt to enter a color name value
18 Try replacing the word NULL with blue and then click OK.
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19 On the Specify a SQL SELECT Statement screen of the wizard,
click Next. It s time to add your query to the application.
that your query will generate. Those methods will be available after this creation from the Listing table adapter. Refer to Figure 8-27 to view this screen containing the two new method names. For both names you basically need to add what your filter is. In your case, you can add ColorName since you filtered by that in your WHERE clause. When done, click Next.
20 A screen appears that will prompt you to name the methods
back with a results screen informing you that your Select statement and your new Fill and Get methods are ready to use. Click the Finish button. Look at the table adapter section of the Listing data table. Your new methods will be added there.
21 After processing for a few seconds, the computer should come
22 Repeat steps starting at step 12 and add another query to the
WHERE (CarType.CarTypeName LIKE % + @cartypename + % )
ListingTableAdapter for the CarType table. Use the following WHERE clause:
Figure 8-27 Dialog box with prompt to rename the methods used to increase search capabilities
Name the fill and get data methods FillByCarTypeName and GetDataByCarTypeName.
23 Repeat steps starting at step 12 and add another query to the ListingTableAdapter for the Make table.
Use the following WHERE clause:
WHERE (Make.MakeName LIKE % + @makename + % )
Name the fill and get data methods FillByMakeName and GetDataByMakeName. You re almost done now, but you still have to bind those new queries to controls on your form. On any data-bound control on your form, you can select Add Query from the smart tag menu. In your case, you want to add search capabilities to the whole form and not simply to a particular control.
see a Search Criteria Builder dialog box that will prompt you to create a new query or pick an existing one. Since you just built three new sets of methods, you merely need to select one. Select the Existing Query Name option and then select FillByColorName as shown in Figure 8-28.
24 Go to the component tray, click the ListingTableAdapter smart tag, and select Add Query. . . You ll
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