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One of the more complex pieces of code in the LawTrack Contacts sample database is triggered from the fsubContactEvents form that s part of the frmContacts form. After signing on correctly to the application, the user can open the frmContacts form, click on the Events tab, and add an event indicating the sale of a product. As soon as the user saves the record, code behind the subform automatically adds the product to the contact, as shown in Figure 23-24.

NTFS implements hard links by keeping a reference count on the actual data, where each time a hard link is created for the file, an additional file name reference is made to the data. This means that if you have multiple hard links for a file, you can delete the original file name that referenced the data (C:\Users\Administrator\Documents\Spec.doc in our example), and the other hard links (C:\Documents\Spec.doc) will remain and point to the data. However, because hard links are on-disk local references to data (represented by file reference records), they can exist only within the same volume and can t span volumes or computers.

Figure 23-24. Logging a product sale event on the Events tab automatically sells the product to the contact.

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private EntitySet<BookAuthor> _BookAuthors; [Association(Name="FK_BookAuthor_Author", Storage="_BookAuthors", OtherKey="Author", ThisKey="ID")] public EntitySet<BookAuthor> BookAuthors { get { return this._BookAuthors; } set { this._BookAuthors.Assign(value); } }

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Microsoft Office Access 2003 Inside Out If you look behind the fsubContactEvents form, you ll find event procedures that detect when the user has created a sale event and that execute an SQL Insert command to create the related product row. The code is as follows:

Option Compare Database Option Explicit Flag to indicate auto-add of a product if new event requires it Dim intProductAdd As Integer Place to store Company Name on a product add Dim varCoName As Variant End of the Declarations Section Private Sub ContactEventTypeID_BeforeUpdate(Cancel As Integer) Did they pick an event that involves a software sale NOTE: All columns in a combo box are TEXT If Me.ContactEventTypeID.Column(4) = "-1" Then Try to lookup this contact s Company Name varCoName = DLookup("CompanyName", "qryContactDefaultCompany", _ "ContactID = " & Me.Parent.ContactID.Value) If not found, then disallow product sale If IsNothing(varCoName) Then MsgBox "You cannot sell a product to a Contact " & _ "that does not have a " & _ "related Company that is marked as the default for this Contact." & _ " Press Esc to clear your edits and click on the Companies tab " & _ "to define the default Company for this Contact.", _ vbCritical, gstrAppTitle Cancel = True End If End If End Sub Private Sub Form_BeforeUpdate(Cancel As Integer) Did they pick an event that involves a software sale NOTE: All columns in a combo box are TEXT If Me.ContactEventTypeID.Column(4) = "-1" Then Do this only if on a new record or they changed the EventID value If (Me.NewRecord) Or (Me.ContactEventTypeID <> _ Me.ContactEventTypeID.OldValue) Then Set the add product flag - product added by AfterUpdate code for safety intProductAdd = True End If End If End Sub Private Sub Form_AfterUpdate() Dim strSQL As String, curPrice As Currency, Dim lngProduct As Long, varCoID As Variant Dim rst As DAO.Recordset, strPreReqName As String See if we need to auto-add a product If (intProductAdd = True) Then Reset so we only do this once intProductAdd = False

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