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Public _statusBar As StatusBar ' Workers Public _navigatorFolders As NavigatorFolders Public _navigatorSearch As NavigatorSearch Public _contentFolders As ContentFileList Public _contentSearch As ContentSearchResults ' Coordinators Public _startup As CoordinatorStartup 'lifecycle: starting up state Public _shutdown As CoordinatorShutdown 'lifecycle: shutting down state Public _cruise As CoordinatorCruise 'lifecycle: cruising state Public _coordinatorSearch As CoordinatorSearch ' Public Sub New() _formSplash = New FormSplash _binder = New Binder(Me) _startup = New CoordinatorStartup _userSettings = New UserSettings End Sub Public Sub Build() ' create the navigators for the left pane _navigatorFolders = New NavigatorFolders _navigatorSearch = New NavigatorSearch ' create the content managers for the right pane _contentFolders = New ContentFileList _contentSearch = New ContentSearchResults ' UI elements _formMenuToolBar = New FormMenuToolBar _statusBar = New StatusBar _formMain = New FormMain ' Coordinators _cruise = New CoordinatorCruise _shutdown = New CoordinatorShutdown _coordinatorSearch = New CoordinatorSearch(_formMain) ' move the navigators and content viewers into FormMain _formMain.NavigatorFolders = _navigatorFolders _formMain.NavigatorSearch = _navigatorSearch _formMain.ContentFolders = _contentFolders _formMain.ContentSearch = _contentSearch ' move the menu, toolbar and statusbar into FormMain _formMain.Menu = _formMenuToolBar.mainMenu _formMain.Toolbar = _formMenuToolBar.panelToolBar _formMain.Statusbar = _statusBar End Sub End Class

Or you could use a statement like this: SQL> GRANT FLASHBACK ANY TABLE TO salapati; Grant succeeded. SQL> You can grant the Flashback Query object privilege (GRANT FLASHBACK ANY TABLE) on a table, view, or a materialized view. Next, use the SELECT . . . AS OF query to retrieve Flashback data from the past. SQL> SELECT * FROM employees AS OF TIMESTAMP TO_TIMESTAMP ('2008-09-02 08:00:00', 'YYYY-MM-DD HH:MI:SS') WHERE last_name = 'Alapati'; Once you confirm the validity of the accidentally deleted data, it s easy to reinsert the data by using the previous query as part of an INSERT statement, as shown here: SQL> INSERT INTO employees SELECT * FROM employees AS OF TIMESTAMP TO_TIMESTAMP('2008-09-02 08:00:00', 'YYYY-MM-DD HH:MI:SS') WHERE last_name = 'Alapati'; The previous two examples use a time stamp to pinpoint the exact time the data was accidentally dropped. You could use the SCN for the transaction instead of time stamps. Just note that an SCN will only put you within 3 seconds of the actual occurrence of the event. If you need to be very specific regarding the time point, use the time-stamp method to specify the time.

Oracle provides a special package called DBMS_FLASHBACK that allows you to see a consistent version of the database at a time (or SCN) that you specify. A big advantage of using the DBMS_ FLASHBACK package over the other Flashback features is that you can use existing PL/SQL code with it to retrieve older data without having to add the AS OF and VERSIONS BETWEEN clauses, which you have to do if you wish to use the other types of Flashback features. You can specify either a time stamp or an SCN number as the starting point for your query. In the simple example that follows, you ll see how you can query for the number of rows that existed in a table before they were deleted permanently from the table. In the following trivial example that illustrates the use of the DBMS_FLASHBACK package, the following query is first used to get the number of rows that currently exist in the employees table: SQL> SELECT COUNT(*) FROM employees; COUNT(*) ----------495 Suppose you re interested in finding out the number of rows that existed in this table on December 11, 2008. You can call the DBMS_FLASHBACK.ENABLE_AT_TIME procedure, as shown in the following code, to specify the specific past point in time you are interested in: SQL> EXECUTE DBMS_FLASHBACK.ENABLE_AT_TIME (TO_TIMESTAMP '11-DEC2008:10:00:00', -'DD-MON-YYYY:hh24:MI:SS'); PL/SQL procedure successfully completed. SQL>

Binder wires the top-level objects together. All the wiring in SystemBrowser is fixed, except in one case: the signal Progress, emitted by NavigatorFolders to update the progress bar on the splash screen. After initialization, this signal is no longer used, so the Binder removes its wiring. All the other wiring is kept in place for the entire life cycle of the system. Listing 11-5 and Listing 11-6 show C# and VB .NET implementations of the Binder. Listing 11-5. The C# Implementation of the Binder public class Binder { private Builder builder; // a handler will be used only during startup // to show progress on the splash screen NavigatorFolders.ProgressHandler progressUpdater; public Binder(Builder theBuilder) { builder = theBuilder; progressUpdater = new NavigatorFolders.ProgressHandler(builder.formSplash.UpdateProgress); } public void Bind() { builder.formMenuToolBar.OnViewFolders += new FormMenuToolBar.UniversalHandler(builder.formMain.ShowFolders); builder.formMenuToolBar.OnViewFolders += new FormMenuToolBar.UniversalHandler(builder.userSettings.ShowFolders); builder.formMenuToolBar.OnViewSearch += new FormMenuToolBar.UniversalHandler(builder.formMain.ShowSearch); builder.formMenuToolBar.OnViewSearch += new FormMenuToolBar.UniversalHandler(builder.userSettings.ShowSearch); builder.formMenuToolBar.OnViewIcons += new FormMenuToolBar.UniversalHandler(builder.contentFolders.ShowIcons); builder.formMenuToolBar.OnViewIcons += new FormMenuToolBar.UniversalHandler(builder.contentSearch.ShowIcons); builder.formMenuToolBar.OnViewDetails += new FormMenuToolBar.UniversalHandler(builder.contentFolders.ShowDetails); builder.formMenuToolBar.OnViewDetails += new FormMenuToolBar.UniversalHandler(builder.contentSearch.ShowDetails); builder.formMenuToolBar.OnUpSelected += new FormMenuToolBar.UniversalHandler( builder.navigatorFolders.SelectParentFolder); builder.formMenuToolBar.OnAddressChanged += new FormMenuToolBar.AddressChangedHandler( builder.navigatorFolders.SelectFolder);