Dim dr As DataRow = e.DataRow
Dim
pf As
String
If dr.RowState <> DataRowState.Added Then '如果不是新增行
Return '那么返回
ElseIf
dr.IsNull("日期") Then '如果没有输入日期
e.Cancel = True '取消保存此行
MessageBox.Show("必须输入日期!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
Return
Else
pf = Format(dr("日期"),"yyMM") '否则获得编号的前缀,两位年,两位月
End If
Dim cmd1 As New
SQLCommand
Dim cmd2 As New
SQLCommand
Dim
Key As
Integer
Dim
nm As
String =
e.DataTable.name
cmd1.ConnectionName =
"编号"
'设置数据源名称
cmd2.ConnectionName = "编号"
cmd1.commandText = "Select Count(*) From [编号] Where [前缀] = '"
&
pf
&
"' And 表名 = '"
&
nm
&
"'"
If
cmd1.ExecuteScalar =
0 Then
'如果编号表不存在前缀的行,那么增加一行
cmd1.commandtext = "Insert Into 编号 (表名, 前缀, 顺序号) Values('"
&
nm
&
"','"
&
pf
&
"',1)"
cmd1.ExecuteNonQuery
End
If
cmd1.commandText =
"Select [顺序号] From [编号] Where [前缀] =
'"
&
pf
&
"' And 表名 = '"
&
nm
&
"'"
Do
Key = cmd1.ExecuteScalar()
'从后台获得顺序号
cmd2.commandText =
"Update [编号] Set [顺序号] = "
& (Key +
1)
&
" Where [顺序号] = "
&
Key
&
" And [前缀] = '"
&
pf
&
"' And 表名 = '"
&
nm
&
"'"
If cmd2.ExecuteNonQuery()
> 0 Then
'更新顺序号
Exit Do '更新成功则退出循环
End If
Loop
e.DataRow("编号") = pf
&
"-"
&
Format(Key,"0000")
这段代码 我只要尾数为4就避开 怎么修改代码