今天刚开始使用Access VBA，可以想象这是一个简单的修复。该程序将计算每个服务类别中的总访客人数。我一定缺少简单的东西。
Public Sub CalculateTotalGuestsForEachService()
'Declare variables
Dim db As DAO.Database
Dim rst As DAO.Recordset
Dim intTotalParty As Integer
'Set the current database
Set db = CurrentDb
'Set the recordset
Set rst = db.OpenRecordset("Select Orders.* From Orders Where ServiceID = 1")
'Cycle through the records
Do While Not rst.EOF
intTotalParty = intTotalParty + rst!NoInParty
rst.MoveNext
Loop
'Display total amount
MsgBox "The total is " & intTotalParty
'Close the recordset
rst.Close
Set rst = Nothing
Set db = Nothing
End Sub
如果任何记录具有Null值，则应用Nz：
intTotalParty = intTotalParty + Nz(rst!NoInParty.Value, 0)
或者，您可以让查询求和：
'Set the recordset
Set rst = db.OpenRecordset("Select Sum(NoInParty) As TotalParty From Orders Where ServiceID = 1")
If rst.RecordCount = 1 Then
intTotalParty = Nz(rst!TotalParty.Value)
End If
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我来说两句