Connection Close 方法、Table Type 屬性範例 (VB)

將 ActiveConnection 屬性設定為 Nothing 應該會關閉目錄的連線。 相關聯的集合將會是空白。 從目錄中結構描述物件所建立的任何物件都會遭到孤立。 尚未快取物件上的任何屬性將仍然可用，但嘗試讀取需要呼叫提供者的屬性將會失敗。

' BeginCloseConnectionVB  
Sub Main()  
    On Error GoTo CloseConnectionByNothingError  
  
    Dim cnn As New ADODB.Connection  
    Dim cat As New ADOX.Catalog  
    Dim tbl As ADOX.Table  
  
    cnn.Open "Provider='Microsoft.Jet.OLEDB.4.0';" & _  
        "Data Source= 'Northwind.mdb';"  
    Set cat.ActiveConnection = cnn  
    Set tbl = cat.Tables(0)  
    Debug.Print tbl.Type    ' Cache tbl.Type info  
    Set cat.ActiveConnection = Nothing  
    Debug.Print tbl.Type    ' tbl is orphaned  
    ' Previous line will succeed if this info was cached.  
    Debug.Print tbl.Columns(0).DefinedSize  
    ' Previous line will fail if this info has not been cached.  
  
    'Clean up.  
    cnn.Close  
    Set cat = Nothing  
    Set cnn = Nothing  
    Exit Sub  
  
CloseConnectionByNothingError:  
    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  
' EndCloseConnectionVB  

關閉用於開啟目錄的 Connection 物件，應與將 ActiveConnection 屬性設定為 Nothing 的效果相同。

Attribute VB_Name = "Connection"  

另請參閱

ActiveConnection 屬性 (ADOX)
Catalog 物件 (ADOX)
Column 物件 (ADOX)
Columns 集合 (ADOX)
Table 物件 (ADOX)
Tables 集合 (ADOX)
Type 屬性 (Table) (ADOX)