主题：采购申请号规则

If e.DataCol.Name = "申请日期"  Then
    If e.DataRow.IsNull("申请日期")  Then
        e.DataRow("采购申请号") = Nothing
    Else
        e.DataRow.save
        Dim bh As String  =  Format(e.DataRow("申请日期"),"yyMMdd")  ' 取得编号的8位前缀
        If e.DataRow("申请类别") = "辅料采购" Then
            bh = "CGSQ" & bh
        Else
            bh = "PJCG" & bh
        End If
        If e.DataRow("采购申请号").StartsWith(bh) = False '如果编号的前8位不符
            Dim dt2 As DataTable = DataTables("采购申请明细")
            Dim max As String
            Dim idx As Integer
            max = e.DataTable.SQLCompute("Max(采购申请号)","采购申请号 like '" & bh & "%' And [_Identify] <> " & e.DataRow("_Identify")) '取得该天的最大编号
            If max > "" Then '如果存在最大编号
                idx = CInt(max.Substring(bh.length,3)) + 1 '获得最大编号的后三位顺序号,并加1
            Else
                idx = 1 '否则顺序号等于1
            End If
            e.DataRow("采购申请号") = bh  & Format(idx,"000")
            e.DataRow.save
        End If
    End If
End If