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You ll recall that in chapter 6 we discussed the disadvantages of programmatic transaction; it s also evident from the previous code that you have to write errorprone code to manage transactions. If you plan to deploy your web module to a Java EE container, an EJB container is included as well. We recommend that you take full advantage of your container by using a session bean to fa ade your entity operations. With this approach, you don t have to worry about programmatic transactions, and you receive extra benefits, such as the ability to inject EntityManager and the power of extended persistence context. Next we ll discuss how you can use an application-managed EntityManager with the JTA transaction manager.

In this section, we ll cover the basic iteration or looping statements in PowerShell. The while statement (also known as a while loop) is the basic PowerShell language construct for creating a loop. It executes the commands in the statement list as long as a conditional test evaluates to true. Figure 6.2 shows the while statement syntax: When you execute a while statement, PowerShell evaluates the <pipeline> section of the statement before entering the <statementList> section. The output from the pipeline is then converted to either true or false, following the rules for the Boolean interpretation of values described in chapter 3. As long as this result converts to true, PowerShell reruns the <statementList> section, executing each statement in the list. For example, the following while statement displays the numbers 1 through 3.

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Table 4.3 Methods for broadcasting intents Method sendBroadcast(Intent intent) sendBroadcast(Intent intent, String receiverPermission) Description Simple form for broadcasting an Intent. Broadcasts an Intent with a permission String that receivers must declare in order to receive the broadcast. Broadcasts an Intent call to the receivers one-byone serially, stopping after a receiver consumes the message.

Finally, the TextGenerationFlag property determines whether the text is written back to front and/or upside down. This property holds one or a combination of the acTextGeneration constants given in Table 11-18.

It s easy to write an adaptor for other products by implementing org.hibernate. cache.CacheProvider. Many commercial caching systems are pluggable into Hibernate with this interface. Not every cache provider is compatible with every concurrency strategy! The compatibility matrix in table 13.1 will help you choose an appropriate combination. Setting up caching involves two steps: First, you look at the mapping metadata for your persistent classes and collections and decide which cache concurrency

protected override void OnLoad(EventArgs e) { if (IsMdiChild) { menuExit.Text = "&Close"; toolBarMain.Visible = false; } base.OnLoad(e); }

session:didReceiveConnectionRequestFromPeer:

The return variable s default value is the return character, or ASCII character 13, and it s useful in text concatenations. Although you can set return to any value you choose, you probably shouldn t, unless you re playing a practical joke on someone. Here s an example of using the return variable: set names_message to "Peter" & return & "Paul" & return & "Mary" The result is as follows: "Peter Paul Mary" Script 8-7 shows another, more flexible way to perform the same general function, this time with added line numbers. Script 8-7. set names_list to {"peter", "paul", "mary"} set names_message to "" repeat with i from 1 to (count names_list) set the_name to item i of names_list set names_message to names_message & i & ". " & the_name & return end repeat display dialog names_message In line 5, you concatenate a bunch of text into a single string and add it onto itself in a repeat loop. The last item you add in each loop is return, which adds another line to the string. In scripts where I use this a lot and want a shorter version of return, I create a global variable called cr for carriage return. Then I add the following statement: set cr to return From that point on, I can use cr as I would the return character.

An identifier property A property meant to be projected (read back from the index)

The Polygon goes one step beyond the Polyline by ensuring that the Shape is always closed. A Polyline creates an open Shape, whereas a Polygon always draws a closed Shape. Listing 18.7 shows a basic trapezoid created with a Polygon.

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Since you now know about to-many relationships, you re probably wondering what a to-one relationship is. Ordinary object composition is a to-one relationship. A car has a to-one relationship with its engine, for instance.

- (void) recordTransaction:(SKPaymentTransaction * )transaction { if([self.transactionHistory containsObject: transaction.payment.productIdentifier]) return; NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString * path = [documentsDirectory stringByAppendingPathComponent:@"history.plist"]; [self.transactionHistory addObject:transaction.payment.productIdentifier]; [self.transactionHistory writeToFile:path atomically:YES]; }

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