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The following is the official definition of the try statement. Optional parameters appear in square brackets. try --statement or statements that may throw an error. on error [error_message] [number error_number] [from offending_object] [to expected_type] [partial result result_list] --the statement/s that will execute in case of an error... end try As you can see in this example, the try statement can be involved. It is usually much simpler, though. Out of all the different parameters, you ll usually need to deal with only the error message and the error number.

(2.6)

So far you have dealt with the try statement as a simple block with a start and an end. Now, however, you ll learn how to add the on error line in the heart of the try statement. From now on, your try statement block will have two compartments: try --compartment 1 on error --compartment 2 end try In compartment 1 you ll put all the statements you want to execute under normal operation. In compartment 2 you ll put all the statements you want to execute if anything goes wrong in compartment 1. Here s another way you can put it: try light candles on cake on error call fire department end try Do you usually invite firefighters to birthday parties I know my wife wouldn t mind she has a thing for firemen but they always seem so busy. However, it is a good idea to have a plan to call the firefighters in case something goes wrong with the candles. One of the most common uses of the on error clause is to trap error number 128, which is the User canceled error. The User canceled error can occur in various ways; for example, it is normally thrown by the display dialog command when the user clicks the Cancel button. Any other button is simply returned in the dialog reply record; only the Cancel button generates an error. Error 128, however, will not generate an ugly error message to the user. All that ll happen if the Cancel button is clicked is that the script will exit, or if it is saved as an application, the application will quit.

Script 17-1 shows a simple example of trapping the Cancel button error. Script 17-1. try display dialog "What's next " buttons {"Cancel", "Go", "Run"} on error display dialog "I'm out of here..." giving up after 5 end try Now this is OK, but what you want to do in many cases is take action only if the error is a specific error. In this case, you want the dialog box displayed only for the User canceled error. For that, you need to know the error number. Just for adventure s sake, let s pretend you don t know exactly what error is thrown or what the error number is. To figure it out, you need to create a little script, make sure that AppleScript throws an error at you, trap it, and analyze it. You do that with the error message and error number values that are returned by the error. To get the error message, you can add a variable identifier immediately after on error. The error message will be assigned to this variable. Examine Script 17-2. Script 17-2. try display dialog "Do it " on error the_error_message display dialog "An error occurred. The message was:" & return & the_error_message end try Figure 17-1 shows the message of the second dialog box. It shows that the value of the variable the_error_message you placed after the on error line was User canceled.

So what did you just do Well, you asked JDeveloper to create a class that can do all the things EntityImpl can do in Java-speak, a subclass but specifically for the Customers entity object. You have also explicitly requested that the class, called CustomersImpl, expose methods that are used when accessing attribute values, creating a row of data, removing a row of data, and performing DML operations on a row of data. You now have the opportunity to augment any of the methods if you so choose. Go to the Application Navigator and, under the Customers entity object, you should now see the newly created class. Double-click CustomersImpl.java and take a look at what JDeveloper has created, described next.