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The manager field is of type FullTimeEmployee and maps to the to the MANAGER column, identified by the name = "MANAGER" attribute on the @JoinColumn annotation. The MANAGER column is a foreign key reference to the table mapped by the FullTypeEmployee entity, which in this case is the same CH04_ST_PERSON table. The @JoinColumn s referencedColumnName = "ID" attribute designates the target column on that table. Because this field maps to the foreign key column, it is considered the owning end of the relationship. The cascade = { CascadeType.ALL } attribute indicates that any operation performed on this entity, Employee, must also be applied to FullTimeEmployee instances referenced by

Because this was pretty fast, I did gloss over a few things. You are probably wondering if the next steps are harder or easier than this. After all, you need to add quite a bit of content to this module. Unfortunately, it does get harder and will require some programming, but nothing you have not seen. In order to understand what you just did, you need to understand the structure of a DNN module. First of all, a DNN module can be thought of as a small program within the larger web program. It can talk to the mother program, but it is completely self-contained. Figure 7-10 shows the program structure of a DNN module.

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this relationship field. For example, if a new Employee instance is created and assigned a FullTimeEmployee as its manager, the act of persisting the Employee instance through EntityManager.persist() will also cause the referenced FullTimeEmployee instance to be persisted as well, if it has not been persisted already. The entity at the other end of this bidirectional relationship, FullTimeEmployee, holds the managedEmployee field.

One of the required features is a method for visitors to contact the organization. I ll use Drupal core s Contact module as the mechanism for providing this functionality. I ll enable the Contact module by

@OneToMany(mappedBy = "manager", cascade = { CascadeType.ALL }) public List<Employee> managedEmployees;

Figure 7-10. DNN module architecture The code for the presentation (UI or GUI) layer is in the DesktopModules TimePunch section of the Solution Explorer. The code for the business logic layer (BLL) and the data access layer (DAL) is in the App_Code TimePunch section of the Solution Explorer.

Since we have already specified the mapping on the owning end, this field can simply refer to that manager field, using the mappedBy = "manager" attribute. This managedEmployees field contains a list of Employee instances, which in practice will be concrete FullTimeEmployee and/or PartTimeEmployee instances. The managedEmployees field is also marked cascade = { CascadeType.ALL }, and so operations applied to the managing FullTimeEmployee will be propagated to all Employee instances in the managedEmployees list.

following the directions covered in 8. After the module is enabled, I ll click on the Configure link on the Modules page for the Contact module, and will follow the directions to create a contact category.

Figure 7-10 shows the typical n-tier architectural model In this case, it is really three tiers with some further abstractions in the database layer The theory for the GUI layer goes like this: Do not put business code in the GUI layer The presentation layer should only include code that the customer will end up seeing It is OK to put validation code in the GUI as long as it is not business validation The GUI should have no idea where its information is coming from A good presentation layer can stay the same while the underlying business and database code changes to accommodate new rules or sources of data The business layer theory goes like this: No GUI presentation code shall reside in the business layer The business layer should provide a fa ade for the GUI to insulate it from the rest of the program.

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