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While a full backup represents the most complete version of the database, performing full backups on a nightly basis may not be possible (or desirable) for a variety of reasons. Earlier in this chapter we used an example of a multi-terabyte database. If only a small percentage of this database changes on a daily basis, the merits of performing a full nightly backup are questionable, particularly considering the storage costs and the impact on users during the backup. A differential backup, an example of which is shown here, is one that includes all database changes since the last full backup:

To change the saving and loading of personalization data so that it is no longer keyed by the URL of the page, we must first create a custom provider which inherits from the base provider class we are using in our portal like so:.

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To allow even more options, you can add branching with additional else if lines, like this: if some_boolean then --perform these statements else if some_boolean_2 then --perform these other statements else if some_boolean_3 then --perform these other statements else --perform these other statements end if The final else line is not required. If included, it handles all the cases that did not fall within the previous conditions. For example, Script 10-6 assigns a reference to Adobe InDesign s front document to the variable this_document. It uses a conditional block to check whether the front document already exists, and if not, it creates one for this purpose. Script 10-6. tell application "InDesign CS" if (exists document 1) then set this_document to document 1 else set this_document to make new document end if end tell

While displaying the components would provide the user interface with the means to get a symbol from the customer and display price information, a screen without some supplementary text and shapes would probably just confuse the customer. Therefore, in the displayForm() method, appropriate text and other geographical shapes will be displayed to make the application more user-friendly. We use the Graphics object to conduct this work.

Listing 3-13. Using HasElements and HasAttributes to Check If the Current Node Has Child Elements and Attributes, Respectively

metadata: a meta-attribute, if you will. We have provided the AttributeUsage attribute constructor with two arguments. The first is a set of flags that indicate the target in this case, the class and its constructor, fields, methods, and properties. The second argument is a flag that indicates whether a given element might receive more than one such attribute. In this example, AllowMultiple is set to true, indicating that class members can have more than one BugFixAttribute assigned.

Listing 14 9. Submitting a Score to a Leaderboard -(void) submitScore:(int64_t)score category:(NSString*)category { GKScore* gkScore = [[[GKScore alloc] initWithCategory:category] autorelease]; gkScore.value = score; [gkScore reportScoreWithCompletionHandler:^(NSError* error) { [self setLastError:error]; bool success = (error == nil); [delegate onScoresSubmitted:success]; }]; }

Notice how in both cases the DataSource is retrieved from a JNDI context. This is a practical requirement, since the connections you will need must be managed within a global transaction manager scope. In the case of JTA, a UserTransaction instance is also required from a JNDI context, so that it can actively participate. In the case of the EXTERNAL transaction manager, it does not need the UserTransaction instance, as it assumes that some external system is managing the transaction participation.

Any attempt to use a sealed class as a base class for inheritance purposes will result in a compiler error. Use the sealed modifier to prevent unintended derivation.

transaction-type = Bean transaction-attribute = Bean-managed transaction EJBs do not use transaction attributes.

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