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The factory methods, combined with the support for deleting child objects implemented in 3, cover creating, retrieving, and deleting objects. This leaves inserting and updating. In both of these cases, the object already exists in memory, and so the Save() method is an instance method on any editable object.
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CHAPTER 4 s DATA ACCESS AND SECURITY
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One Save() method can be used to support inserting and updating an object s data because all editable objects have an IsNew property. Recall from 3 that the definition of a new object is that the object s primary key value doesn t exist in the database. This means that if IsNew is true, then Save() causes an insert operation; otherwise, Save() causes an update operation. Csla.BusinessBase and Csla.BusinessListBase are the base classes for all editable business objects, and both these base classes implement Save() methods: public virtual T Save() { if (this.IsChild) throw new NotSupportedException(Resources.NoSaveChildException); if (EditLevel > 0) throw new Validation.ValidationException(Resources.NoSaveEditingException); if (!IsValid) throw new Validation.ValidationException(Resources.NoSaveInvalidException); if (IsDirty) return (T)DataPortal.Update(this); else return (T)this; } public T Save(bool forceUpdate) { if (forceUpdate && IsNew) { // mark the object as old - which makes it // not dirty MarkOld(); // now mark the object as dirty so it can save MarkDirty(true); } return this.Save(); } The first Save() method is the primary one that does the real work. It implements a set of common rules that make sense for most objects. Specifically, it does the following: Ensures that the object is not a child (since child objects must be saved as part of their parent) Makes sure that the object isn t currently being edited (a check primarily intended to assist with debugging) Checks to see if the object is valid; invalid objects can t be saved Checks to make sure the object is dirty; there s no sense saving unchanged data into the database Notice that the method is virtual, so if a business developer needs a different set of rules for an object, it is possible to override this method and implement something else. The second Save() method exists to support Web Services (discussed in 10). It allows a web service author to create a new instance of the object, load it with data, and then force the object to do an update (rather than an insert) operation. The reason for this is that when creating a web service to update data, the application calling the web service often passes all the data needed to update the database; there s no need to retrieve the existing data just to overwrite it. This optional overload of Save() enables that scenario. This is done by first calling MarkOld() to set IsNew to false, and then calling MarkDirty() to set IsDirty to true. This feature can also be useful for some stateless Web Forms implementations as well.
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In either case, it is the DataPortal.Update() call that ultimately triggers the data portal infrastructure to move the object to the application server so it can interact with the database. It is important to notice that the Save() method returns an instance of the business object. Recall that .NET doesn t actually move objects across the network; rather, it makes copies of the objects. The DataPortal.Update() call causes .NET to copy this object to the server so the copy can update itself into the database. That process could change the state of the object (especially if you are using primary keys assigned by the database or timestamps for concurrency). The resulting object is then copied back to the client and returned as a result of the Save() method.
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It is critical that the UI update all its references to use the new object returned by Save(). Failure to do this means that the UI will be displaying and editing old data from the old version of the object.
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