VB类Class设计

Private Sub Class_Initialize()
    'load
    ' Indicate the the database is not yet open
    mblnRecSetOpen = False
    ' Clear all object variables
    Call ClearObject
   
End Sub

Private Sub Class_Terminate()
    'unload

    ' We don't really care about errors when cleaning up.
    On Error Resume Next
    ' Close the recordset
    mrecExpense.Close
    ' Close the expense database
    mdbExpense.Close
    ' Reset the error handler
    On Error GoTo 0
    Exit Sub
   
End Sub

'属性
Public Property Let strEmployeeId(ByVal vData As String)
'used when assigning a value to the property, on the left side of an assignment.
'Syntax: X.strEmployeeId = 5
    mvarstrEmployeeId = vData
End Property

Public Property Get strEmployeeId() As String
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.strEmployeeId
    strEmployeeId = mvarstrEmployeeId
End Property

'方法
Public Function MoveLast() As String
' Retrieve the last record

    On Error GoTo MoveError
   
    With mrecExpense
        If True = .BOF _
        And True = .EOF Then
            ' Empty recordset
            MoveLast = "EOF"
        Else
            ' Move to the last record
            .MoveLast
            Call GetRecordset(mrecExpense)
            MoveLast = "OK"
        End If
    End With
   
    Exit Function

MoveError:
    ' Return the error description
    MoveLast = Err.Description
    Err.Clear
    Exit Function
End Function

Private Sub SetRecordset(recExp As Recordset)
' Copies current values to Recordset

    With recExp
        !EmployeeId = mvarstrEmployeeId
        !ExpenseType = mvarstrExpenseType
        !AmountSpent = mvarcurAmountSpent
        !Description = mvarstrDescription
        !DatePurchased = mvardtmDatePurchased
        !DateSubmitted = mvardtmDateSubmitted
    End With
   
End Sub