参数集合、Command 属性示例 (VB)

以下代码演示如何将 Command 属性与 Command 对象一起使用，以检索过程的参数信息。

' BeginParametersVB  
Sub Main()  
    On Error GoTo ProcedureParametersError  
  
    Dim cnn As New ADODB.Connection  
    Dim cmd As ADODB.Command  
    Dim prm As ADODB.Parameter  
    Dim cat As New ADOX.Catalog  
  
    ' Open the Connection  
    cnn.Open _  
        "Provider='Microsoft.Jet.OLEDB.4.0';" & _  
        "Data Source='Northwind.mdb';"  
  
    ' Open the catalog  
    Set cat.ActiveConnection = cnn  
  
    ' Get the command object  
    Set cmd = cat.Procedures("CustomerById").Command  
  
    ' Retrieve Parameter information  
    cmd.Parameters.Refresh  
    For Each prm In cmd.Parameters  
        Debug.Print prm.Name & ":" & prm.Type  
    Next  
  
    'Clean up  
    cnn.Close  
    Set cat = Nothing  
    Set cmd = Nothing  
    Set cnn = Nothing  
    Exit Sub  
  
ProcedureParametersError:  
  
    Set cat = Nothing  
    Set cmd = 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  
' EndParametersVB  

另请参阅

ActiveConnection 属性 (ADOX)
目录对象 (ADOX)
Command 属性 (ADOX)
过程对象 (ADOX)
过程集合 (ADOX)