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1. To start entering rows in the Color table, right-click the Color table in Database Explorer, and select Show Table Data. Your designer surface should have a grid like the one shown in Figure 8-13.
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8: Managing the Data
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Entering Data
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While typing your data, look to the table s leftmost area in the table data grid, and you ll see a small pencil icon, a star, or a small black triangle. The pencil indicates you re modifying the row. The star indicates a new row, and the small black triangle indicates the current row.
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Figure 8-13 Empty Color table in the table data grid
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2. Let s add the first color. Click the Color Name field, type Dark Blue, and then press the Tab key to go to the next column. Type true in the Metallic field. Because that column type is a bit, its values can be either true or false only because a bit type is a binary type. When you re done, press the Tab key to go to the next row. 3. Add three more car colors Red, Silver, and Black and set Red as Metallic and the other two colors as nonmetallic (that is, false). When done, the table should look like the one shown in Figure 8-14.
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Figure 8-14 Color table with four new rows of data
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4. Add the data in Table 8-5 and Table 8-6 to the Make and CarType tables, respectively. MakeName GoodRoadster SmallCar BigSUV ReliableCar
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Table 8-5 Data for the Make Table
Country Germany France USA Japan
Don t Add Data to Identity Columns
For all columns you created as identity columns, don t type the data because the field s value will automatically be generated by SQL Server 2005 Express Edition whenever the row is created in the table. If you try to type data in an identity column, you will not be allowed to do so. When the cursor is in an identity column, you ll see near the navigation bar at the bottom of the Table Designer that the cell is read-only.
CarTypeName Roadster SUV Hatchback Sedan Coupe
Table 8-6 Data for the CarType Table
NumberOfDoors 2 5 5 4 2
You might not have realized that by giving a type to your data, you actually added data integrity verification to your database. Try modifying one of the Color rows by changing the Metallic column to read Helloworld instead of true or false. You ll get an error message telling you that the Metallic field is of type Boolean. To show how data integrity is preserved using the foreign key constraints, you ll add two Listing rows. You will enter more rows when using your Windows Forms application. 5. Right-click the Listing table, select Show Table Data, and add the two rows shown in Table 8-7.
8: Managing the Data
ColorID
MakeID
CarTypeID
DateSeen
Year
Price
Cylinder
EPGCity
EPGHighway
Notes
08/11/2008
http://www. litwareinc.com/
This is my dream car, follow regularly.
07/30/2008
http://www. cpandl.com/
Too much gas
Table 8-7 Data for the Listing Table
MORE INFO
You can navigate through the table by using the navigation controls at the bottom of the grid. You can use these controls to perform tasks such as moving to the first and last rows, moving to the previous and next entries, moving to a new record, or moving directly to a specific row by entering the row number.
6. You ll now verify that one of your foreign key constraints is working correctly. Open the Make table by right-clicking the Make table and selecting Show Table Data. 7. Let s try to delete the first row by clicking the leftmost field where the pencil usually appears. The row should be selected, and all the fields should be blue. Right-click, and select Delete. 8. A dialog box should appear inquiring whether you really want to delete the row. Click Yes. 9. You should receive the following dialog box error message stating that the row was not deleted because of the foreign key constraint: Error Message: The DELETE statement conflicted with the REFERENCE constraint FK_Listing_Make. This statement affirms why the foreign key constraint was created, which was to avoid orphaned rows. Figure 8-15 depicts what the error dialog box looks like and what kind of information is provided to help you debug the problem, Figure 8-15 if necessary. In this case, it s not Error dialog box showing the foreign key relationship preventing the a problem but a feature of your deletion of a row from the Make table creation!
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10. Click OK to exit this dialog box. 11. Test your other constraints related to the Listing table by trying to delete the first row of the CarType table. You should receive the same error message. Now that you have all your domain tables loaded with some data, you ll learn to use the database in a Windows Forms application. You ll learn about ADO.NET and about data bindings with Windows Forms controls.
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