问题RT,使用下面代码再SQLTable中的BeforeSaveDataRow事件中,为什么提示 对象名 '编号' 无效啊,而且也关闭不了。
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
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 & "'"
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 (前缀, 顺序号) Values('"
&
pf
&
"',1)"
cmd1.ExecuteNonQuery
End If
cmd1.commandText = "Select [顺序号] From [编号] Where [前缀] = '"
&
pf
&
"'"
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
&
"'"
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")
补充一下,为什么再这里的表明用[]括号起来呢?而不是用{}
[此贴子已经被作者于2013-11-20 13:15:21编辑过]