VC++ ADO Access，怎么能够得到字段中设定的小数位数

_ConnectionPtr pConn;
_RecordsetPtr pRec;
pConn.CreateInstance(__uuidof(Connection));
pConn->Open(_bstr_t(strDataSource), "", "", adConnectUnspecified);
pRec = pConn->Execute(_bstr_t(strQuery), 0, adCmdText);

CreateProperty Method Example

This example tries to set the value of a user-defined property. If the property doesn't exist, it uses the CreateProperty method to create and set the value of the new property. The SetProperty procedure is required for this procedure to run.

Sub CreatePropertyX()

   Dim dbsNorthwind As Database
   Dim prpLoop As Property

   Set dbsNorthwind = OpenDatabase("Northwind.mdb")

   ' Set the Archive property to True.
   SetProperty dbsNorthwind, "Archive", True
   
   With dbsNorthwind
      Debug.Print "Properties of " & .Name
      
      ' Enumerate Properties collection of the Northwind 
      ' database.
      For Each prpLoop In .Properties
         If prpLoop <> "" Then Debug.Print "  " & _
            prpLoop.Name & " = " & prpLoop
      Next prpLoop

      ' Delete the new property since this is a 
      ' demonstration.
      .Properties.Delete "Archive"

      .Close
   End With

End Sub

Sub SetProperty(dbsTemp As Database, strName As String, _
   booTemp As Boolean)

   Dim prpNew As Property
   Dim errLoop As Error

   ' Attempt to set the specified property.
   On Error GoTo Err_Property
   dbsTemp.Properties("strName") = booTemp
   On Error GoTo 0

   Exit Sub

Err_Property:

   ' Error 3270 means that the property was not found.
   If DBEngine.Errors(0).Number = 3270 Then
      ' Create property, set its value, and append it to the 
      ' Properties collection.
      Set prpNew = dbsTemp.CreateProperty(strName, _
         dbBoolean, booTemp)
      dbsTemp.Properties.Append prpNew
      Resume Next
   Else
      ' If different error has occurred, display message.
      For Each errLoop In DBEngine.Errors
         MsgBox "Error number: " & errLoop.Number & vbCr & _
            errLoop.Description
      Next errLoop
      End
   End If

End Sub