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The first time I call DataProvider.Instance.AddTimePunch, the DataProvider constructor gets called, which calls the CreateProvider method. This, in turn, instantiates the objProvider member variable to something meaningful. Finally, the AddTimePunch method gets called in the DataProvider class. The second time I call DataProvider.Instance.AddTimePunch, the constructor does not get called; instead, the now-instantiated objProvider member calls the AddTimePunch method directly. I am a really big fan of static/shared classes. You will find them littered throughout the .NET Framework. The next file to edit in the BLL is the TimePunchController.vb file.

Listing 4-31. FullTimeEmployee.java, Employing an Illicit Entity Callback to Finally Stick It to the Man!

published and promoted to front page check boxes as we want the article to appear on the homepage of our site. Once finished, click the Edit link to the right of the title of the content item that you created and scroll to the bottom of the page (see Figure 2-17).

This file acts as the interface to the GUI. It abstracts the business and database layers from the GUI. Since the methods in here call methods in the DataProvider class, the arguments must match. You need to change many of the public methods in here. The only things that change, though, are the arguments. Here is the new code from within the Public Methods region of TimePunchController.vb:

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@Entity @Inheritance public class FullTimeEmployee extends Employee { ... @PreUpdate public void wishfulThinking() { if (getHomeAddress().getZipCode() == 94402) { setSalary(getSalary() + 10000); } } ... }

#Region "Public Methods" ''' --------------------------------------------------------''' <summary> ''' gets an object from the database ''' </summary> ''' <remarks> ''' </remarks> ''' <param name="moduleId">The Id of the module</param> ''' <history> ''' </history> ''' ----------------------------------------------------------Public Function GetTimePunchs(ByVal ModuleId As Integer, _ ByVal PunchUserID As Integer) _ As List(Of TimePunchInfo) Return CBO.FillCollection(Of TimePunchInfo)(DataProvider.Instance(). _ GetTimePunchs(ModuleId, _ PunchUserID)) End Function ''' ----------------------------------------------------------''' <summary> ''' gets an object from the database ''' </summary> ''' <remarks> ''' </remarks> ''' <param name="ModuleId">The Id of the module</param> ''' <param name="ItemId">The Id of the item</param> ''' <history> ''' </history> ''' --------------------------------------------------------------Public Function GetTimePunch(ByVal ModuleId As Integer, _ ByVal ItemId As Integer) _ As TimePunchInfo Return CType(CBO.FillObject(DataProvider.Instance(). _ GetTimePunch(ModuleId, _ ItemId), _ GetType(TimePunchInfo)), TimePunchInfo) End Function

We have covered a fair bit of ground in this chapter, and with this information you should be ready to go out and build some powerful entities that are configured to best suit your application domain. Table 4-4 provides a summary of the key concepts we covered in this chapter.

Figure 2-17. Preparing to delete a content item At the bottom of the page you ll see a Delete button. Click it, and you ll be prompted with a do you really want to delete it screen. Click the Delete button, which will trigger Drupal to physically remove your content item from the Drupal database. Drupal will then take you back to the front page of your website, where you ll see that your content item no longer exists, and the menu item you created earlier in this chapter is also gone.

EJB 3 provides built-in support for three common O/R mapping strategies for entity class inheritance hierarchies. We examined the strengths and weaknesses of each approach, and offered examples of common use cases that map best to each strategy. EJB 3 offers flexible solutions when it comes to mixing entities with abstract and non-entity classes in a type hierarchy. Entities may be either concrete or abstract. Only entity classes may be queried or serve as the targets of mapped entity relationships, but entities may still make use of non-entity classes, both by embedding them and by extending them or being extended by them. We showed some examples that mix these options together to illustrate their use.

''' -----------------------------------------------------------''' <summary> ''' adds an object to the database ''' </summary> ''' <remarks> ''' </remarks> ''' <param name="objTimePunch">The TimePunchInfo object</param> ''' <history> ''' </history> ''' ---------------------------------------------------------Public Sub AddTimePunch(ByVal objTimePunch As TimePunchInfo) DataProvider.Instance().AddTimePunch(objTimePunch.ModuleId, _ objTimePunch.PunchType, _ objTimePunch.PunchUserID) End Sub ''' ---------------------------------------------------------''' <summary> ''' saves an object to the database ''' </summary> ''' <remarks> ''' </remarks> ''' <param name="objTimePunch">The TimePunchInfo object</param> ''' <history> ''' </history> ''' -------------------------------------------------------------Public Sub UpdateTimePunch(ByVal objTimePunch As TimePunchInfo) DataProvider.Instance().UpdateTimePunch(objTimePunch.ModuleId, _ objTimePunch.ItemId, _ objTimePunch.PunchUserID, _ objTimePunch.PunchType, _ objTimePunch.PunchDate) End Sub ''' ''' ''' ''' ''' -------------------------------------------------------------<summary> deletes an object from the database </summary> <remarks>

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