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Note When I use the term process in this chapter, consider it to be synonymous with the term thread on operating systems where Oracle is implemented with threads (such as Windows). In the context of this chapter, I use the term process to cover both processes and threads. If you are using an implementation of Oracle that is multiprocess, such as you see on UNIX, the term process is totally appropriate. If you are using a single-process implementation of Oracle, such as you see on Windows, the term process will actually mean thread within the Oracle process. So, for example, when I talk about the DBWn process, the equivalent on Windows is the DBWn thread within the Oracle process.

The built-in scrollable components only respond to Up, Down, Right, and Left You already learned how to register an event handler for the Select button to be notified if a selected list box item is pressed Further, you can display a menu for your page if the Menu button is clicked; go to the previous menu page if the Back button is clicked; or use the Home button to go to your start screen This requires you to provide the buttons on your device surface and connect them to GPIO input pins It is up to you to map the GPIO input pins to the predefined button commands with your custom input provider That means, with the WPF, you install event handlers not for particular pins but for the buttons, such as ButtonMenu or ButtonUp.

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Public Shared Function GetList() As PaymentTerms Return DataPortal.Fetch(Of PaymentTerms)( _ New Criteria(GetType(PaymentTerms))) End Function Private Sub DataPortal_Fetch(ByVal criteria As Criteria) IsReadOnly = False ' load data from database IsReadOnly = True End Sub End Class The goal of the NameValueListBase class is to allow the business developer to write as little code as possible when implementing a strongly typed name/value list. As you can see, the developer needs only to create a Private constructor, a factory method, and the DataPortal_Fetch() method, which contains the data access code to load the list with data.

Server processes are those that perform work on behalf of a client session. They are the processes that ultimately receive and act on the SQL statements our applications send to the database. In 2, we briefly touched on two connection types to Oracle, namely the following: Dedicated server, whereby you get a dedicated process on the server for your connection. There is a one-to-one mapping between a connection to the database and a server process or thread. Shared server, whereby many sessions share a pool of server processes spawned and managed by the Oracle instance. Your connection is to a database dispatcher, not to a dedicated server process created just for your connection.

Note It is important to understand the difference between a connection and a session in Oracle terminology. A connection is just a physical path between a client process and an Oracle instance (e.g., a network connection between you and the instance). A session, on the other hand, is a logical entity in the database, where a client process can execute SQL and so on. Many independent sessions can be associated with a single connection, and these sessions can even exist independently of a connection. We will discuss this further shortly.

Name/value lists are read-only collections that expose a list of child objects. Each child object contains a name and a value. Of course, the framework doesn t know the data types of the name and value ahead of time, but generics can help overcome that issue. A nested NameValuePair class will be declared within NameValueListBase, using generic type parameters to define the types for the name and value. The NameValueListBase class takes two generic type parameters, one for the name (key) and the other for the value: <Serializable()> _ Public MustInherit Class NameValueListBase(Of K, V) Inherits Core.ReadOnlyBindingList(Of NameValuePair) Implements ICloneable Implements Core.IBusinessObject It also inherits from Csla.Core.ReadOnlyBindingList, specifying that the type of item contained in the collection is NameValueListBase(Of K, V).NameValuePair.

In order to get a notification when a button is clicked for your focused text flow element, you need to add the following lines: textFlowAddHandler(ButtonsButtonDownEvent, new ButtonEventHandler(textFlow_ButtonDown), false // handledEventsToo ); You can also add the handler to your main window instead of to a particular element, in order to get the events regardless of which child has the focus It is also possible to trigger to the ButtonUpEvent to be notified when a button is released In the previous code, there is a boolean parameter called handledEventsToo This flag indicates whether you want to get handled events too If this paramter is false, you will not get the Up, Down, Right, and Left events for a TextFlow element, because this element handles these events (it marks these events as handled even if it did not need to scroll).

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