Question

我在保存到数据库时遇到了问题。我上传时继续插入重复数据。我可以知道如何预防吗？我的代码中没有错误。

asp.net

   <asp:FileUpload ID="FileUpload" runat="server" AllowMultiple="true" />

vb.net

  Try
        If Me.FileUpload.PostedFile.FileName = "" Then
            Throw New Exception("Please  Attach file!")
        Else

            For Each postedfile As HttpPostedFile In FileUpload.PostedFiles

                fileName = Me.lblId2.Text & "_" & Path.GetFileName(FileUpload.PostedFile.FileName)
                FileUpload.PostedFile.SaveAs((Server.MapPath("~/Attachment/UploadFile_/") + fileName))
                FilePath = "~/Attachment/UploadFile_/" + fileName
                filesize = Convert.ToInt32(fileName.Length)

                params.Clear()
                strsql = " INSERT INTO tb_upload " & _
                         " (UploadDT, cr_runnum,DestFileName,DataSize, FileName, Remarks) VALUES " & _
                         " (@UploadDT, @cr_runnum, @DestFileName, @DataSize, @FileName, @Remarks)"

                params.Add("@UploadDT", Format(datetimenow, "dd MMM yyyy hh:mm:ss tt"))
                params.Add("@cr_runnum", Me.lblId2.Text.Trim)
                params.Add("@DestFileName", FilePath)
                params.Add("@DataSize", filesize)
                params.Add("@FileName", fileName)
                params.Add("@Remarks", Me.txtRemarks.Text)

                iResult = Common.execNonQuery(strsql, Common.txn, params)

                If iResult = 0 Then
                    Throw New Exception("Data insertion failed. Please contact MIS Administrator!")
                End If

            Next


        lblUnsuccess.Text = String.Format("{0} files have been uploaded successfully.", FileUpload.PostedFiles.Count)
        End If

    Catch ex As Exception
        Me.lblUnsuccess.Text = ex.Message
    Finally
        Common.CloseConn()
    End Try

函数exec非查询 refer here exec non query

Answer 1

问题在于您使用的是publishFile作为循环变量，但每次循环时，您使用的是FileUpload.PostedFile而不是postedFile。 FileUpload.PostedFile是一种快捷方式，它为您提供了PostedFiles的第一个元素。

此外，正如注释中提到的user7452368，fileName.Length是fileName字符串的长度，而不是文件的大小。这是somebody else's question about how to get the file size。

上传多个图像时数据重复

1 个答案: