Eigenschaften "Append", "Key Type", "RelatedColumn", "RelatedTable" und "UpdateRule" (Beispiel) (VB)

Gilt für: Access 2013, Office 2013

Im folgenden Code wird das Erstellen eines neuen Fremdschlüssels veranschaulicht. Für das Beispiel wird vorausgesetzt, dass zwei Tabellen (Customers und Orders) vorhanden sind.

 
' BeginCreateKeyVB 
Sub Main() 
 On Error GoTo CreateKeyError 
 
 Dim kyForeign As New ADOX.Key 
 Dim cat As New ADOX.Catalog 
 
 ' Connect the catalog 
 cat.ActiveConnection = "Provider='Microsoft.Jet.OLEDB.4.0';" & _ 
 "Data Source='c:\Program Files\Microsoft Office\" & _ 
 "Office\Samples\Northwind.mdb';" 
 
 ' Define the foreign key 
 kyForeign.Name = "CustOrder" 
 kyForeign.Type = adKeyForeign 
 kyForeign.RelatedTable = "Customers" 
 kyForeign.Columns.Append "CustomerId" 
 kyForeign.Columns("CustomerId").RelatedColumn = "CustomerId" 
 kyForeign.UpdateRule = adRICascade 
 
 ' Append the foreign key 
 cat.Tables("Orders").Keys.Append kyForeign 
 
 'Delete the Key as this is a demonstration 
 cat.Tables("Orders").Keys.Delete kyForeign.Name 
 
 'Clean up 
 Set cat.ActiveConnection = Nothing 
 Set cat = Nothing 
 Set kyForeign = Nothing 
 Exit Sub 
 
CreateKeyError: 
 Set cat = Nothing 
 Set kyForeign = Nothing 
 
 If Err <> 0 Then 
 MsgBox Err.Source & "-->" & Err.Description, , "Error" 
 End If 
 
End Sub 
' EndCreateKeyVB