具名命令

建立及執行簡單命令會顯示執行命令的其中一種方式。 有另一種方式：您可以將其設定為具名命令，然後直接在 Connection 物件上呼叫此具名命令 (指派給 Command 物件的 ActiveConnection 屬性)。 命名命令表示將名稱指派給 Command 物件的 Name 屬性。 例如，

objCmd.Name = "GetCustomers"  
objCmd.ActiveConnection = objConn  
objConn.GetCustomers objRs  

具名命令的作用就像是 Connection 物件的「自訂方法」一樣。 命令結果會以此「自訂方法」的 out 參數形式傳回。

下列範例將示範此功能。

'BeginNamedCmd  
    On Error GoTo ErrHandler:  
  
    Dim objConn As New ADODB.Connection  
    Dim objCmd As New ADODB.Command  
    Dim objRs As New ADODB.Recordset  
  
    ' Connect to the data source.  
    Set objConn = GetNewConnection  
  
    objCmd.CommandText = "SELECT CustomerID, CompanyName FROM Customers"  
    objCmd.CommandType = adCmdText  
  
    'Name the command.  
    objCmd.Name = "GetCustomers"  
  
    objCmd.ActiveConnection = objConn  
  
    ' Execute using Command.Name from the Connection.  
    objConn.GetCustomers objRs  
  
    ' Display.  
    Do While Not objRs.EOF  
        Debug.Print objRs(0) & vbTab & objRs(1)  
        objRs.MoveNext  
    Loop  
  
    'clean up  
    objRs.Close  
    objConn.Close  
    Set objRs = Nothing  
    Set objConn = Nothing  
    Set objCmd = Nothing  
    Exit Sub  
  
ErrHandler:  
    'clean up  
    If objRs.State = adStateOpen Then  
        objRs.Close  
    End If  
  
    If objConn.State = adStateOpen Then  
        objConn.Close  
    End If  
  
    Set objRs = Nothing  
    Set objConn = Nothing  
    Set objCmd = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
'EndNamedCmd  

另請參閱

Connection 物件 (ADO)