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Both of these helper functions are implemented as static methods so that they can be easily used by calling code without having to first create an instance of a class. This is possible because we do not need to keep hold of any state outside of the two helper methods. Now that our data is being saved and loaded in a secure format, all that remains is to create the logic within the web part that allows users to switch it into an editing mode so that they can change the content for the web part. Managing WebPart behavior We have a number of options at our disposal to allow the user to switch the web part into edit mode so that the content can be updated. One way might be to display some custom controls on the chrome of the web part such as a button to allow the user to toggle in between an editing and a viewing state. For our web part, we will simply use verbs to allow the user to invoke the necessary actions, because using a verb is probably a slightly simpler task than adding a button and handling its click event. The snippet shown in listing 6.14 shows the code required to add the necessary custom verbs to our web part that will allow management over the content.

6

+ T ype + Elem entID + N am e + + AddProperty () + AddElem entProperty () + AddC om ponentProperty() + AddEvent ()

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The single greatest challenge when learning to program is that you must learn everything before you can learn anything. Even this simple Hello World program uses many features of the language that we will discuss in coming chapters, including classes, namespaces, statements, static methods, objects, strings, blocks, and libraries. It s as though you were learning to drive a car. You must learn to steer, accelerate, brake, and understand the flow of traffic. Right now, we re going to get you out on the highway and just let you steer for a while. Over time, you ll learn how to speed up and slow down. Along the way, you ll learn to set the radio and adjust the heat so that you ll be more comfortable. In no time you ll be driving, and then won t your parents begin to worry. Hang on tight; we re going to zip through this quickly and come back to the details in subsequent chapters.

To add an event handler to an event, the handler must have the same return type and signature as the event s delegate. Use the += operator to add an event handler to an event, as shown in the following code. The method can be any of the following: An instance method A static method An anonymous method A lambda expression For example, the following code adds three methods to event Elapsed. The first is an instance method using the method form. The second is a static method using the method form. The third is an instance method using the delegate form. Class Instance method mc.Elapsed += ca.TimerHandlerA; // Method reference form mc.Elapsed += ClassB.TimerHandlerB; // Method reference form Event member Static method mc.Elapsed += new EventHandler(cc.TimerHandlerC); // Delegate form Just as with delegates, you can use anonymous methods and lambda expressions to add event handlers. For example, the following code first uses a lambda expression and then an anonymous method. mc.Elapsed += (source, args) => { Console.WriteLine("Lambda expression."); }; // Lambda expression

To efficiently support the job queues, we ll use a parameter table to pass inputs to our jobs: big_table@ORA11GR2> create table job_parms 2 ( job number primary key, 3 lo_rid rowid, 4 hi_rid rowid 5 ) 6 / Table created. This will allow us to just pass the job ID into our SERIAL procedure, so it can query this table to get the rowid range it is to process. Now, for our procedure (the code in bold is the new code we ll be adding): big_table@ORA11GR2> create or replace 2 procedure serial( p_job in number ) 3 is 4 l_rec job_parms%rowtype; 5 begin 6 select * into l_rec 7 from job_parms 8 where job = p_job; 9 10 for x in ( select object_id id, object_name text 11 from big_table 12 where rowid between l_rec.lo_rid 13 and l_rec.hi_rid ) 14 loop 15 -- complex process here 16 insert into t2 (id, text, session_id ) 17 values ( x.id, x.text, p_job ); 18 end loop; 19 20 delete from job_parms where job = p_job; 21 commit; 22 end; 23 / Procedure created.

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