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Private Sub Form_BeforeUpdate(Cancel As Integer) Dim rst As DAO.Recordset, strNames As String If on a new row, If (Me.NewRecord = True) Then ... check for similar name If Not IsNothing(Me.LastName) Then Open a recordset to look for similar names Set rst = CurrentDb.OpenRecordset("SELECT LastName, FirstName FROM " & _ "tblContacts WHERE Soundex([LastName]) = " & _ Soundex(Me.LastName) & " ") If got some similar names, collect them for the message Do Until rst.EOF strNames = strNames & rst!LastName & ", " & rst!FirstName & vbCrLf rst.MoveNext Loop Done with the recordset rst.Close Set rst = Nothing

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The ability to represent our data through more natural object hierarchies allows us to work with it in a more familiar programming manner. We establish the object dependencies based on the specific business needs and we can work with it as we would any set of objects. This allows us to maintain our business rules and integrity without having to focus on the relational nature of the underlying store. If we want, we can restate our running example using a hierarchical syntax as shown in listing 6.24.

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Distributed File System (DFS) is a service that layers on top of the Workstation service to connect together file shares into a single namespace. The file shares can reside on the same computer or on different computers, and DFS provides client access to the resources in a location-transparent manner. The root of a DFS namespace must be a file share defined on a Windows server. In addition to delivering a unified network-resource namespace, DFS provides other benefits through DFS replica sets. An administrator can create a DFS replica set from two or more shares and use a replication mechanism such as File Replication Service (FRS) to copy data between the shares of a replica set to keep their contents synchronized. DFS provides several forms of load

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See if we got some similar names If Len(strNames) > 0 Then Yup, issue warning If vbNo = MsgBox("LawTrack Contacts found contacts with similar " & _ "last names already saved in the database: " & vbCrLf & vbCrLf & _ strNames & vbCrLf & _ "Are you sure this contact is not a duplicate ", _ vbQuestion + vbYesNo + vbDefaultButton2, gstrAppTitle) Then Cancel the save Cancel = True End If End If End If End If End Sub

Table<Subject> subjects = dataContext.GetTable<Subject>(); var query = from subject in subjects orderby subject.Name select new { subject.Name, Books = from book in subject.Books where book.Price < 30 select new { book.Title, book.Price } };

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The code checks only when the user is about to save a new row. It opens a recordset to fetch any other contact records where the Soundex code of the last name matches the last name about to be saved. It includes all names it finds in the warning message so that the user can verify that the new contact is not a duplicate. If the user decides not to save the record, the code sets the Cancel parameter to True to tell Access not to save the new contact.

You certainly can and should define relationships between your tables and ask Access to enforce referential integrity to prevent saving unrelated records or deleting a record that still has related records in other tables. In most cases, you do not want to activate the cascade delete feature to automatically delete related records. However, Access displays a message the record cannot be deleted or changed because tblXYZ contains related records whenever the user tries to delete a record that has dependent records in other tables. You can do your own testing in code behind your forms in the Delete event and give the user a message that more clearly identifies the problem. For example, here s the code in the Delete event procedure of the frmContacts form in the LawTrack Contacts application:

Private Sub Form_Delete(Cancel As Integer) Dim db As DAO.Database, qd As DAO.QueryDef, rst As DAO.Recordset Dim varRelate As Variant Check for related child rows Get a pointer to this database Set db = CurrentDb Open the test query Set qd = db.QueryDefs("qryCheckRelateContact") Set the contact parameter qd!ContactNo = Me.ContactID Open a recordset on the related rows Set rst = qd.OpenRecordset() If we got rows, then can t delete If Not rst.EOF Then varRelate = Null Loop to build the informative error message

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