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----  流水账加入按年的为计算的代码  (http://foxtable.com/bbs/dispbbs.asp?boardid=2&id=184890)

--  作者:sjf0823
--  发布时间:2023/1/13 10:21:00
--  流水账加入按年的为计算的代码
Select Case e.DataCol.Name
    Case "产品","入库","出库"
        Dim drs As List(of DataRow)
        Dim Filter As String
        Filter = "[_SortKey] >= " & e.DataRow("_SortKey") & " And [产品] = \'" & e.DataRow("产品") & "\'"
        drs = e.DataTable.Select(Filter)
        For Each dr As DataRow In drs
            Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'"
            Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
            Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
            dr("库存") = Val1 - Val2
        Next
        If e.DataCol.Name = "产品" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
            Filter = "[_SortKey] > " & e.DataRow("_SortKey") & " And [产品] = \'" & e.OldValue & "\'"
            drs = e.DataTable.Select(Filter)
            For Each dr As DataRow In drs
                Filter = "[_SortKey] <= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'"
                Dim Val1 As Double = e.DataTable.Compute("Sum(入库)",Filter)
                Dim Val2 As Double = e.DataTable.Compute("Sum(出库)",Filter)
                dr("库存") = Val1 - Val2
            Next
        End If
End Select

老师,我要加一个按年度来做库存计算节点,比如2022年的库存截止2022年结束,2023年对应的库存重新开始流水记算,代码需要怎么加?

--  作者:有点蓝
--  发布时间:2023/1/13 10:34:00
--  
增加一个年份列,然后增加一个年份条件即可,比如
Filter = "[_SortKey] >= " & e.DataRow("_SortKey") & " And [产品] = \'" & e.DataRow("产品") & "\' and 年份=" & e.DataRow("年份")

建议增加一个同结构的表。每年1月1日对上一年做个年结,然后把今年以前的数据全部移到这个表里。原表永远只保留今年的数据