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----  流水账问题  (http://foxtable.com/bbs/dispbbs.asp?boardid=2&id=149265)

--  作者：swagger
--  发布时间：2020/4/27 16:49:00
--  流水账问题

如图片，如果加多一个产品ID，这段该怎么修改呢？
此主题相关图片如下：流水账.png

Select Case e.DataCol.Name
    Case "产品","入库","出库"
        Dim dr As DataRow
        Dim mr As DataRow = e.DataRow
        Dim drs As List(of DataRow)
        Dim jk As Integer
        Dim ck As Integer
        dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & mr("产品") & "\'", "[_SortKey] Desc")
        If dr Is Nothing Then \'如果是第一行,计算结存
            jk =  DataTables("例子二").SQLCompute("Sum(入库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & mr("产品") & "\'")
            ck =  DataTables("例子二").SQLCompute("Sum(出库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & mr("产品") & "\'")
            mr("库存") = e.DataRow("入库") - e.DataRow("出库") + jk - ck
            dr = mr
        End If
        drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'", "[_SortKey]")
        For i As Integer = 1 To drs.Count - 1
            drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")
        Next
        If e.DataCol.Name = "产品" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then \'如果修改的是产品列
            dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & e.OldValue & "\'", "[_SortKey] Desc") \'找出旧产品的上一行
            If dr Is Nothing Then \'如果不存在上一行,那么本行就是旧产品的第一行,由于已经被修改为新产品,需要找出旧产品现在的第一行
                dr = e.DataTable.Find("[产品] = \'" & e.OldValue & "\'", "[_SortKey]") \'找出旧产品现在的第一行
                If dr IsNot Nothing Then \'如果找到,计算库存
                    jk =  DataTables("例子二").SQLCompute("Sum(入库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & e.OldValue & "\'")
                    ck =  DataTables("例子二").SQLCompute("Sum(出库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & e.OldValue & "\'")
                    dr("库存") = dr("入库") - dr("出库") + jk - ck
                End If
            End If
            If dr IsNot Nothing Then
                drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\'", "[_SortKey]")
                For i As Integer = 1 To drs.Count - 1
                    drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")
                Next
            End If
        End If
End Select

--  作者：有点蓝
--  发布时间：2020/4/27 17:20:00
--
所有地方都加多一个条件，另外可能要分开处理一下，大概这样

Select Case e.DataCol.Name
Case "入库","出库","产品","产品ID"
Dim dr As DataRow
Dim mr As DataRow = e.DataRow
Dim drs As List(of DataRow)
Dim jk As Integer
Dim ck As Integer
dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & mr("产品") & "\' and [产品ID] = \'" & mr("产品ID") & "\' ", "[_SortKey] Desc")
If dr Is Nothing Then \'如果是第一行,计算结存
jk = DataTables("例子二").SQLCompute("Sum(入库)","[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & mr("产品") & "\' and [产品ID] = \'" & mr("产品ID") & "\' ")
ck = DataTables("例子二").SQLCompute("Sum(出库)","[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & mr("产品") & "\' and [产品ID] = \'" & mr("产品ID") & "\'")
mr("库存") = e.DataRow("入库") - e.DataRow("出库") + jk - ck
dr = mr
End If
drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\' and [产品ID] = \'" & mr("产品ID") & "\'", "[_SortKey]")
For i As Integer = 1 To drs.Count - 1
drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")
Next
End Select

Select Case e.DataCol.Name
Case "产品"
Dim dr As DataRow
Dim mr As DataRow = e.DataRow
Dim drs As List(of DataRow)
Dim jk As Integer
Dim ck As Integer
If e.OldValue IsNot Nothing Then
dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品] = \'" & e.OldValue & "\' and [产品ID] = \'" & mr("产品ID") & "\' ", "[_SortKey] Desc") \'找出旧产品的上一行
If dr Is Nothing Then \'如果不存在上一行,那么本行就是旧产品的第一行,由于已经被修改为新产品,需要找出旧产品现在的第一行
dr = e.DataTable.Find("[产品] = \'" & e.OldValue & "\'and [产品ID] = \'" & mr("产品ID") & "\' ", "[_SortKey]") \'找出旧产品现在的第一行
If dr IsNot Nothing Then \'如果找到,计算库存
jk = DataTables("例子二").SQLCompute("Sum(入库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & e.OldValue & "\' and [产品ID] = \'" & mr("产品ID") & "\' ")
ck = DataTables("例子二").SQLCompute("Sum(出库)","[_SortKey] < " & mr("_SortKey") & " And 产品 = \'" & e.OldValue & "\' and [产品ID] = \'" & mr("产品ID") & "\' ")
dr("库存") = dr("入库") - dr("出库") + jk - ck
End If
End If
If dr IsNot Nothing Then
drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品] = \'" & dr("产品") & "\' and [产品ID] = \'" & mr("产品ID") & "\' ", "[_SortKey]")
For i As Integer = 1 To drs.Count - 1
drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")
Next
End If
End If
Case "产品ID"
Dim dr As DataRow
Dim mr As DataRow = e.DataRow
Dim drs As List(of DataRow)
Dim jk As Integer
Dim ck As Integer
If e.OldValue IsNot Nothing Then
dr = e.DataTable.Find("[_SortKey] < " & mr("_SortKey") & " And [产品ID] = \'" & e.OldValue & "\' and [产品] = \'" & mr("产品") & "\' ", "[_SortKey] Desc") \'找出旧产品的上一行
If dr Is Nothing Then \'如果不存在上一行,那么本行就是旧产品的第一行,由于已经被修改为新产品,需要找出旧产品现在的第一行
dr = e.DataTable.Find("[产品ID] = \'" & e.OldValue & "\'and [产品] = \'" & mr("产品") & "\' ", "[_SortKey]") \'找出旧产品现在的第一行
If dr IsNot Nothing Then \'如果找到,计算库存
jk = DataTables("例子二").SQLCompute("Sum(入库)","[_SortKey] < " & mr("_SortKey") & " And 产品ID = \'" & e.OldValue & "\' and [产品] = \'" & mr("产品") & "\' ")
ck = DataTables("例子二").SQLCompute("Sum(出库)","[_SortKey] < " & mr("_SortKey") & " And 产品ID = \'" & e.OldValue & "\' and [产品] = \'" & mr("产品") & "\' ")
dr("库存") = dr("入库") - dr("出库") + jk - ck
End If
End If
If dr IsNot Nothing Then
drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & " And [产品ID] = \'" & dr("产品ID") & "\' and [产品] = \'" & mr("产品") & "\' ", "[_SortKey]")
For i As Integer = 1 To drs.Count - 1
drs(i)("库存") = drs(i-1)("库存") + drs(i)("入库") - drs(i)("出库")
Next
End If
End If
End Select