专家坐堂-自动编号的帮助文件代码....Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

Select e.DataCol.Name

Case "制单日期","工程代码"

If e.DataRow.IsNull("制单日期") OrElse e.DataRow.IsNull("工程代码") Then

e.DataRow("单据编号") = Nothing

Else

Dim d As Date = e.DataRow("制单日期")

Dim y As Integer = d.Year

Dim m As Integer = d.Month

Dim Days As Integer = Date.DaysInMonth(y,m)

Dim fd As Date = New Date(y,m,1) \'获得该月的第一天

Dim ld As Date = New Date(y,m,Days) \'获得该月的最后一天

Dim bh As String = e.DataRow("工程代码") & "-" & Format(d,"yyyyMM") & "-" \'生成编号的前缀

If e.DataRow("单据编号").StartsWith(bh) = False \'如果单据编号前缀不符

Dim max As String

Dim idx As Integer

Dim flt As String

flt = "工程代码 = \'"& e.DataRow("工程代码") & "\' And 制单日期 >= #" & fd & "# And 制单日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")

max = e.DataTable.Compute("Max(单据编号)",flt) \'取得该月的相同工程代码的最大单据编号

If max > "" Then \'如果存在最大单据编号

idx = CInt(max.Substring(12,4)) + 1 \'获得最大单据编号的后四位顺序号,并加1

Else

idx = 1 \'否则顺序号等于1

End If

e.DataRow("单据编号") = bh & Format(idx,"0000")

End If

End Select