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Note An object table is different from a standard relational table. Object tables are used to store UDT objects instead of relational data. In an object table, each row represents an object, referred to as a row object.

Figure 23-4. Shaping a form to match a bitmap To design the application shown in Figure 23-4, a custom bitmap is assigned to the background, which skins the application. However, there s still the problem of getting the form background to match the picture background. You can handle this by constructing a Region object with the same dimensions, but there s actually a far easier approach, which works through the Form.TransparencyKey property. Here s how it works: You can define a special color for the form that will automatically be cut out by setting the TransparencyKey property. For example, if you choose dark blue, all occurrences of dark blue in your form become invisible. To use this technique with a background image like the one in Figure 23-4, all you need to do is make sure the outside of your picture is filled with a color that is clearly distinguishable from all the colors on the form (often, a nearfluorescent pink is used). Then you can show the picture on the form by setting the Form.BackgroundImage property, and the portion outside the edges will be chopped out automatically.

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Figure 3-8. Recovery timeline During the recovery process, the transaction processing system must UNDO some of the log record changes and REDO others. The following steps are taken in order to restore the database state to its most current version: 1. Start at the most recent checkpoint in the log file (for our purposes here, the only checkpoint shown). The recovery process first adds all active transactions recorded in the checkpoint record to a list of UNDO transactions. This means that in our scenario, the T2 transaction is added to the UNDO list. 2. Read each log record in order from the checkpoint. For each START TRANSACTION record encountered, put that transaction in the UNDO list as well. For any COMMIT records encountered, move that transaction out of the UNDO list and into the REDO list. 3. REDO all the actions contained in the REDO list, ensuring that these operations are made permanent. 4. UNDO all the operations in the UNDO list, including any statements contained in that transaction that occurred before the checkpoint.

Note The TransparencyKey property is supported only on Windows 2000 or later. Plus, transparency can fail to work on certain video cards if your color depth is greater than 24-bit, and it can also fail when you use double buffering. As a result, when using TransparencyKey you should also use the Form.Region property. Set the region to be at least an approximation of the shape you want to avoid the worst of these problems.

To create an object table, right-click the Tables node in the Server Explorer, and choose the New Object Table menu item (as shown in Figure 15-18).

When designing a background image, you may need to experiment to get the best result. Ideally, you want a clean, shaped border around all edges. To avoid problems, you may want to minimize curves altogether and use mostly straight lines. When adding the region behind your picture, you also need to make sure that your drawing program doesn t use antialiasing. For example, to create the background picture for the form shown in Figure 23-4, a bright yellow background was used behind the shaped image (Figure 23-5). This yellow color exactly matches the Form.TransparencyKey yellow. However, if the drawing program uses antialiasing to blend the background edges with the yellow color underneath (as most drawing programs do), you ll have a problem. Near the edges of the shape, the drawing program will use other, subtly different shades of yellow to create a softer blended edge. These shades of yellow won t match the Form.TransparencyKey value, so they won t be removed. To avoid this problem, you need to prevent antialiasing between the two shapes, or use a background color that s similar enough to the image border color that the antialiased edge won t stand out. To get a really professional look, you may need to hand-smoothen the edge of your shape before you apply the background. Artistic techniques like this could improve the edging you see in Figure 23-4.

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