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As you learned in 3, when two subjects are related many-to-many in your database, you must define a linking table to create the relationship. You will often add fields in the linking table to further clarify the relationship between a row in one of the related tables and the matching row in another. Figure 23-9 shows you the table in the LawTrack Contacts application that defines the link between companies and contacts.

SELECT [t0].[ID], [t0].[Description], [t0].[Name] FROM [Subject] AS [t0]

Two special yes/no fields in this table identify which company is the default for a contact and which contact is the default for a company. However, a contact can t have two or more default companies. Likewise, it doesn t make sense for a company to have more than one default contact. To verify this type of special unique value constraint you must add business rules in code behind the forms you provide the user to edit this data. You can find the code that ensures that there is only one default company for each contact in code behind the fsubContactCompanies form in the LawTrack Contacts sample application (Contacts.mdb). The code is in the Before Update event procedure for the DefaultForContact control on the form. The code is as follows:

Private Sub DefaultForContact_BeforeUpdate(Cancel As Integer) Disallow update if there s no Company ID yet If IsNothing(Me.CompanyID) Then

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SubjectId=a0e2a5d7-88c6-4dfe-a416-10eadb978b0b Description=null For first Name=Software development Books=... Subject SELECT [t0].[ID] AS [BookId], [t0].[Isbn], [t0].[Notes], [t0].[PageCount], [t0].[Price], [t0].[PubDate] AS [PublicationDate], [t0].[Summary], [t0].[Title], [t0].[Subject] AS [SubjectId], [t0].[Publisher] AS [PublisherId] FROM [dbo].[Book] AS [t0] WHERE [t0].[Subject] = @p0 -- @p0: Input UniqueIdentifier (Size = 0; Prec = 0; Scale = 0) NOT NULL [a0e2a5d7-88c6-4dfe-a416-10eadb978b0b] Books: BookId=b1c7670c-fdf5-45e5-8f06-3b7994b6a346 Isbn=0-222-77777-2 Notes=null PageCount=256 Price=35.5000 PublicationDate=4/1/2007 Summary=null Title=C# on Rails SubjectId=a0e2a5d7-88c6-4dfe-a416-10eadb978b0b Subject={ } PublisherId=855cb02e-dc29-473d-9f40-6c3405043fa3 Books: BookId=4f3b0ac1-3746-4067-a810-79a9ce02a7bf Isbn=0-000-77777-2 Notes=null PageCount=101 Price=25.5500 PublicationDate=11/10/2004 Summary=null Title=Funny Stories SubjectId=a0e2a5d7-88c6-4dfe-a416-10eadb978b0b Subject={ } PublisherId=4ab0856e-51f3-4b67-9355-8b11510119ba

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SELECT [t0].[ID] AS [BookId], [t0].[Isbn], For second Subject [t0].[Notes], [t0].[PageCount], [t0].[Price], [t0].[PubDate] AS [PublicationDate], [t0].[Summary], [t0].[Title], [t0].[Subject] AS [SubjectId], [t0].[Publisher] AS [PublisherId] FROM [dbo].[Book] AS [t0] WHERE [t0].[Subject] = @p0 -- @p0: Input UniqueIdentifier (Size = 0; Prec = 0; Scale = 0) NOT NULL [92f10ca6-7970-473d-9a25-1ff6cab8f682] Books: BookId=09017e35-ca66-40b8-80a4-ba5253716e33 Isbn=2-444-77777-2 Notes=null PageCount=50 Price=29.0000 PublicationDate=2/18/1973 Summary=null Title=Bonjour mon Amour SubjectId=92f10ca6-7970-473d-9a25-1ff6cab8f682 Subject={ } PublisherId=4ab0856e-51f3-4b67-9355-8b11510119ba

MsgBox "You must select a Company / Organization before" & _ " you can set Default.", vbCritical, gstrAppTitle Cancel = True Exit Sub End If Make sure there s only one default Check only if setting Default = True If (Me.DefaultForContact = True) Then Try to lookup another contact set Default If Not IsNothing(DLookup("ContactID", "tblCompanyContacts", _ "ContactID = " & Me.Parent.ContactID & _ " AND CompanyID <> " & Me.CompanyID & _ " AND DefaultForContact = True")) Then oops... MsgBox "You have designated another Company as the" & _ " Default for this Contact." & _ " You must remove that designation before you" & _ " can mark this Company as the Default.", _ vbCritical, gstrAppTitle Cancel = True End If End If End Sub

arbitrary network topologies (such as ring, star, or mesh). Computers can also be members of multiple replica sets. DFSR uses Remote Differential Compression (RDC) to compress replica sets, which means that only differences between two servers are replicated, reducing bandwidth. DFSR is implemented as a Windows service (\%SystemRoot%\System32\Dfsr.exe) that uses authenticated RPC with encryption to communicate between instances of itself running on different computers. In addition, because Active Directory contains its own replication capabilities, DFSR uses Active Directory APIs to retrieve FRS configuration information from a domain s Active Directory. DFSR also exposes a WMI interface for tracing, configuration, and management of the service.

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First, the code verifies that the user has chosen a company for this record. (The Link Child and Link Master properties of the subform control provide the ContactID.) Next, if the user is attempting to mark this company as the default for the contact, the code uses the DLookup function to see if any other record exists (in the tblCompanyContacts table for the current contact) that is also marked as the default. If it finds such a duplicate record, it warns the user and sets the Cancel parameter to True to prevent saving the change to the control. You ll find similar code in the fsubCompanyContacts form that makes sure only one contact is the primary for any company.

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