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If you don t like this behavior, your business class can override the framework s Save() method and replace that logic with other logic.
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All the data access code that handles the saving of the object is located in DataPortal_Insert() or DataPortal_Update(). Recall that in 4 the data portal implementation included logic to check the object s IsNew and IsDeleted properties to properly route any update operation to the appropriate DataPortal_XYZ method. Deleting a root object will be discussed later.
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It s important to recall that when the server-side DataPortal is remote, the updated root object returned to the UI is a new object. The UI must update its references to use this new object in lieu of the original root object.
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Note that the DataPortal_XYZ methods are responsible not only for saving the object s data, but also for starting the process of saving all the child object data. Calling the data portal does not save child objects; they are saved because their root parent object directly calls internal-scoped Insert(), Update(), or DeleteSelf() methods on each child collection or object, thereby causing them to save their data.
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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
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Figure 7-6. Adding or updating a root object
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Adding, Editing, and Deleting Child Objects
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Child objects are inserted, updated, or deleted as part of the process of updating a root parent object. To support this concept, child collections implement an internal method named Update(). Child objects within a collection implement internal methods, named Insert(), Update(), and DeleteSelf(), that can be called by the collection during the update process. It is helpful for related root, child, and child collection classes to be placed in the same project (assembly) so that they can use internal scope in this manner. The sequence of events to add, edit, or delete a child object is as follows: 1. The root object s DataPortal_XYZ method calls the child collection s Update() method; the parent object is passed as a parameter so that child objects can use root object property values as needed (such as for foreign key values). 2. The child collection s Update() method loops through all the deleted child objects in the collection, calling each deleted object s DeleteSelf() method. 3. The child collection s Update() method loops through all its active child objects, calling each child object s Insert() or Update() method based on the child object s IsNew property value. 4. At this point, all the child object data has been inserted, updated, or deleted as required.
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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
5. From the perspective of the child collection object, just one method is called, as follows: Update() 6. From the perspective of each child object, one of three methods is called, as follows: Insert() Update() DeleteSelf() Figure 7-7 illustrates this process. Remember that this diagram is connected with the previous diagram showing the update of a root object. The events depicted in this diagram occur as a result of the root object s DataPortal_Insert() or DataPortal_Update() being called, as shown earlier in Figure 7-6.
Figure 7-7. Adding, updating, and deleting child objects in a collection
The Insert() and Update() methods often accept parameters. Typically, the root object s primary key value is a required piece of data when saving a child object (since it would be a foreign key in the table), and so a reference to the root object is typically passed as a parameter to the collection s Update() method, and then to each child object s Insert() or Update() method. Passing a reference to the root object is better than passing any specific property value, because it helps to decouple the root object from the child object. Using a reference means that the root object doesn t know or care what actual data is required by the child object during the update process that information is encapsulated within the child class. Also, when implementing transactions manually using ADO.NET, rather than System. Transactions or Enterprise Services, the ADO.NET transaction object will also need to be passed as a parameter, so that each child object can update its data within the same transaction as the root object.
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