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Since we only want to list the subjects, we re not fetching the books. By only fetching the books if and when we really need them, we can optimize our network bandwidth, minimize memory consumption, and limit the amount of work the database needs to do. We can extend this sample by instructing the ObjectDumper to not only display the Subjects, but also display its children by telling it we want to view one child level in addition to the base level. The ObjectDumper.Write method accepts an overload to indicate the level we want to view. Change the last line in listing 6.25 to request the first-level children as well as follows:

23

23

22

23

ObjectDumper.Write(Subjects, 1);

23

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On the client side, DFS support is implemented in another device driver (%SystemRoot%\System32\Drivers\Dfsc.sys) and uses the SMB redirector for its internal communication with DFS servers. The DFS client provider is implemented in \%SystemRoot%\System32\Ntlanman.dll. When a client issues a file I/O request that specifies a file in the DFS namespace, the DFS client driver communicates with the target file server by using the appropriate redirector. DFS also includes DFS Replication (DFSR). Its primary purpose is to replicate the contents of any DFS share, as well as the domain controller s \SYSVOL directory, which is where Windows domain controllers store logon scripts and Group Policy files. (Group Policy permits administrators to define usage and security policies for the computers that belong to a domain.) DFSR allows for distributed multimaster replication, which enables any server to perform replication activity. When a replicated directory or file is changed, the changes are propagated to the other domain controllers. The fundamental concept in DFSR is a replica set, which consists of two or more systems that replicate between themselves the contents of a directory tree according to an administratively defined schedule and replication topology, which is the set of connections that defines the relationship between domain controllers in a forest and the directory partition replicas they share. Only directories on NTFS volumes can be replicated because DFSR relies on the NTFS change journal to detect changes to files in directories in a replica set. Because DFSR is based on multimaster replication, it can theoretically support hundreds or even thousands of systems as part of a replica set, and the computers of a replica set (called a replica group) can be connected with

Microsoft Office Access 2003 Inside Out the contact doesn t own. It s not possible to ask Access to perform this sort of test in a validation rule, so you must write code to enforce this business rule. Figure 23-8 shows you the message the user sees when trying to sell support for a product that the contact doesn t own. This message also appears if the user attempts to sell the special upgrade to the multi-user product, and the contact doesn t already own the prerequisite single-user product.

23 23 22 23 23 23

Note that the child records for each subject are fetched only when we want them. This lazy loading behavior is beneficial when we don t need to display all of the children for all parent objects, but only want to fetch them as the user requests the details. As we request the books for each subject, we will send a separate query to the database for each row of the Subject table. Listing 6.26 shows sample output from the changed version of the code.

The code that enforces this business rule is in the Before Update event procedure of the fsubContactProducts form. The code is as follows:

Private Sub Form_BeforeUpdate(Cancel As Integer) Dim lngPreReq As Long, strPreReqName As String Check for prerequisite If Not IsNothing(Me.cmbProductID.Column(6)) Then Try to lookup the prerequisite for the contact lngPreReq = CLng(Me.cmbProductID.Column(6)) If IsNull(DLookup("ProductID", "tblContactProducts", _ "ProductID = " & lngPreReq & " And ContactID = " & _ Me.Parent.ContactID)) Then Get the name of the prerequisite strPreReqName = DLookup("ProductName", "tblProducts", _ "ProductID = " & lngPreReq) Display error MsgBox "This contact must own prerequisite product " & strPreReqName & _ " before you can sell this product.", vbCritical, gstrAppTitle Cancel the edit Cancel = True End If End If End Sub

Automating Your Application with Visual Basic Remember from Figure 23-2 that the query providing the row source for the cmbProductID combo box includes any prerequisite product ID in its seventh column. When the code finds a prerequisite, it uses the DLookup function to verify that the current contact already owns the required product. If not, then the code looks up the name of the product, includes it in an error message displayed to the user, and disallows saving the product by setting the Cancel parameter to True. This enforces the business rule and makes it crystal clear to the user what corrective action is necessary.

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