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Figure 4-16. Apply Rule To options in the Edit Formatting Rule dialog box The Selected cells option works in many cases, but when you rearrange the pivot table, the conditional formatting may not adjust correctly. In your pivot table, incorrect cells may be formatted because they are within the range of cells to which the rule is applied. In this example, the second option, All Cells Showing Sum of Sales Values, might also include too many cells, such as subtotals, and Grand Totals. The third option, All Cells Showing Sum of Sales Values for Date and Product, is the best option for this pivot table. It restricts the formatting to cells where the Date and Product values appear, and it excludes the subtotals and the Grand Totals. 5. Select the third option, All Cells Showing Sum of Sales Values for Date and Product. 6. Click OK, twice, to close the two dialog boxes. The conditional formatting is now applied correctly, to the individual value cells. The Grand Total cells are not formatted, and their values are not included in the average calculation. You can send the modified report to the sales manager, and go for a well-earned lunch break before the meeting starts.

A builder works in reactive mode if it creates objects on demand and returns them to client objects. The builder is not responsible for deciding when to create objects. Reactive builders are similar to the Builder OO design pattern.9 Figure 1-44 shows how you might use a reactive builder to solve the UTC-to-ATC transform problem.

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We have covered many alternatives to implement optimistic locking. Which one should you use Usually the technique that saves the old values and does a simple comparison with the new values is the simplest and generally the best technique. It does make the APIs more complicated, though, since you need to pass the old and new values back and forth. It also adds to the network traffic depending on the number of columns being modified and their size. The technique that calculates the checksum proxies the old column values with a checksum. Checksum calculation can, however, take extra CPU time, and there does exist a tiny chance that the checksum for two different input values is the same. For an existing application, the technique of using a shadow column will work only if it is feasible to change the current tables to add the new columns for an existing application. And using ora_rowscn is feasible only if you are using 10g and you can create (or re-create) your tables with the rowdependencies option.

Figure 1-44. Using a reactive builder to eliminate UTC between A and B Class A delegates to Builder the task of creating B objects, so A calls Builder when it needs an instance of B. Is this new design better than the original one Let s look at the pros and cons. On the pro side, A is less strongly coupled to B than before, because now it has ambiguous coupling instead of unambiguous coupling. Also, the Builder makes the system more flexible, because the Builder might provide A with objects of classes derived from B, which provide features that B didn t provide. On the con side, A is now coupled to two classes: B and Builder. The subflavor of type coupling that occurs between A and Builder depends on whether A instantiates the Builder (causing Tu) or A receives a reference to Builder from another object (causing Ta). We re now in a position to state the first Builder pattern for converting UTC into ATC.

In most cases, optimistic locking is the best alternative to avoid lost updates for the majority of web applications that use connection pooling. However, it does suffer from the disadvantage that a user may have spent a lot of time making changes, only to be told to try her changes again. Pessimistic locking, on the other hand, is suitable for client/server applications that maintain state across pages.

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