如下代码演示如何创建新的外部关键字。假定已存在两个表(Customers 和 Orders)。
Sub CreateKey()
Dim kyForeign As New ADOX.Key
Dim cat As New ADOX.Catalog
cat.ActiveConnection = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=c:\Program Files\Microsoft Office\" & _
"Office\Samples\Northwind.mdb;"
kyForeign.Name = "CustOrder"
kyForeign.Type = adKeyForeign
kyForeign.RelatedTable = "Customers"
kyForeign.Columns.Append "CustomerId"
kyForeign.Columns("CustomerId").RelatedColumn = "CustomerId"
kyForeign.UpdateRule = adRICascade
cat.Tables("Orders").Keys.Append kyForeign
End Sub