ADOX 程式碼範例：NumericScale 和 Precision 屬性範例 (VB)

此範例示範 Column 物件的 NumericScale 和 Precision 屬性。 此程式碼會顯示 Northwind 資料庫 Order Details 資料表的值。

' BeginNumericScalePrecVB  
Sub Main()  
    On Error GoTo NumericScalePrecXError  
  
    Dim cnn As New ADODB.Connection  
    Dim cat As New ADOX.Catalog  
    Dim tblOD As ADOX.Table  
    Dim colLoop As ADOX.Column  
  
    ' Connect the catalog.  
    cnn.Open "Provider='Microsoft.Jet.OLEDB.4.0';" & _  
        "data source='Northwind.mdb';"  
    Set cat.ActiveConnection = cnn  
  
    ' Retrieve the Order Details table  
    Set tblOD = cat.Tables("Order Details")  
  
    ' Display numeric scale and precision of  
    ' small integer fields.  
    For Each colLoop In tblOD.Columns  
        If colLoop.Type = adSmallInt Then  
            MsgBox "Column: " & colLoop.Name & vbCr & _  
                "Numeric scale: " & _  
                colLoop.NumericScale & vbCr & _  
                "Precision: " & colLoop.Precision  
        End If  
    Next colLoop  
  
    'Clean up  
    cnn.Close  
    Set cat = Nothing  
    Set cnn = Nothing  
    Exit Sub  
  
NumericScalePrecXError:  
    Set cat = Nothing  
  
    If Not cnn Is Nothing Then  
        If cnn.State = adStateOpen Then cnn.Close  
    End If  
    Set cnn = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  
' EndNumericScalePrecVB  

另請參閱

Column 物件 (ADOX)
NumericScale 屬性 (ADOX)
Precision 屬性 (ADOX)