在 MS Access 中选择列表框

Question

亲爱的人们，我需要一点帮助。我有一个表单，其中有列表框，通过选择列表框，我在表单中填充了一些字段和子表单。 我想要实现的是子表单不应该有 0 条记录。 所以我有一个控件在哪里检查记录集是否为 0 并弹出一条消息，但退出子没有帮助，用户仍然可以进入下一条记录。

    Private Sub lstRev_BeforeUpdate(Cancel As Integer)
    Dim DataConn10 As New ADODB.Recordset
    Dim Comm10 As String
    Set Conn = CurrentProject.Connection
    Comm10 = " SELECT tblLIVE.SID " & _
   " FROM tblLIVE " & _
   " WHERE tblLIVE.CID = " & Me.txtCID & " And tblLIVE.PID =
   " & Me.txtPIDRev & " And tblLIVE.MNumber = '" & Me.txtSMNum & "'"
    DataConn10.Open Comm10, Conn, adOpenKeyset, adLockOptimistic
    If DataConn10.RecordCount = 0 And Not IsNull(Me.txtMIDRev) Then
    Dim x As Integer
    x = MsgBox("Are sure that you want to leave the form without adding Line in subform.    If you press yes Rev will be deleted. If you press No please enter Line", vbYesNo)
    If x = vbYes Then
   MsgBox "Delete"
  Else
  MsgBox "EnterSOV"
  'Here I need something to tell him to stay in the same record :(
  DataConn10.Close
  Exit Sub
  End If
  End If
  End Sub

Answer 1

您可以添加Cancel=True 以防止更新前的方法完成。只需在您的 Exit Sub 之前添加此内容即可。