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Private Sub Form_BeforeUpdate(Cancel As Integer)

    '¨M©w¥Ø«e°O¿ý¬O§_¬°·s°O¿ý
    If Me.NewRecord Then
   
        '©w¸q¤å¦r¦r¦êªºÅܼÆ
        Dim strSQL As String
        '¿é¤J¨ú±o¶i³f³æ·í¤é³Ì¤jªº¶i³f³æ¸¹½Xªº¬d¸ßSQL»yªk
        strSQL = "SELECT MAX(Seq) AS Seq " & _
                 "FROM PurchaseDetails " & _
                 "WHERE PurchaseID = '" & Form_¶i³f³æºûÅ@![PurchaseID] & "' "
        '©w¸q¸ê®Æ¶°ª«¥óRecordSetªºª«¥óÅܼÆ
        Dim rst As ADODB.Recordset
        '«Ø¥ß¸ê®Æ¶°ª«¥óRecordSet
        Set rst = New ADODB.Recordset
        '¶}±Ò¸ê®Æ¶°ª«¥ó,¥H³s±µ¦ÜStock¸ê®Æ®w
        rst.Open strSQL, CurrentProject.Connection
        '©w¸q³Ì¤j¶µ¦¸ªº¾ã¼ÆÅܼÆ
        Dim MaxSeq As Integer
        '±q¸ê®Æ¶°ª«¥ó¨Ó¨ú±o¬d¸ß¨ìªº³Ì¤j¶µ¦¸
        MaxSeq = Val(rst.GetString)
        '·sªº¶µ¦¸¬°³Ì¤j¶µ¦¸¥[1
        Me![Seq] = MaxSeq + 1
        'Ãö³¬¸ê®Æ¶°ª«¥óRecordset
        rst.Close
        'ÄÀ©ñ¸ê®Æ¶°ª«¥óRecordset©Ò¦û¥Îªº¸ê·½
        Set rst = Nothing
   
    End If
   
    '­pºâ¤p­pª÷ÃB(=¼Æ¶q*³æ»ù)
    Me![SubTotal] = Me![Quantity] * Me![Price]

End Sub

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