主题：[求助]CaseStudy:"独占式编辑二"及帮助文档有误

表的DoubleClick事件增加一行：

If e.Row("编辑者") = User.Name Then '如果编辑者是当前用户
    Return
End If
Dim cmd As New SQLCommand
Dim exp As String  = "编辑者 Is Null And [_Identify] = " & e.Row("_Identify")
cmd.CommandText = "Update {员工} Set 编辑者 = '" & User.Name & "' Where " & exp
If cmd.ExecuteNonQuery = 1 Then
    e.Row("编辑者") = User.Name
    e.Row.Save()
    Forms("编辑窗口").Open()
Else
    cmd.CommandText = "Select 编辑者 From {员工} Where [_Identify] = " & e.Row("_Identify")
    Dim nm As String = cmd.ExecuteScalar
    If nm > "" Then
        MessageBox.show(nm & "正在编辑此行!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Else
        MessageBox.show("此行可能已经被删除,无法编辑!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    End If
End If