代码如下:敬请过目!
If Me.FileUpload1.PostedFile.ContentLength > 0 Then Dim cn As New Data.OleDb.OleDbConnection Dim dc As Data.OleDb.OleDbCommand Dim para As Data.OleDb.OleDbParameter Dim SQL, FileName As String '连线字符串 cn.ConnectionString = Me.AccessDataSource1.ConnectionString cn.Open() '运行 TextBox 中的 SQL 指令 FileName = Me.FileUpload1.PostedFile.FileName SQL = "insert into FileStorage (FileName,FileBody) values ('" & FileName & "',?)" '建立 SqlCommand 对象 dc = New Data.OleDb.OleDbCommand(sql, cn) para = New Data.OleDb.OleDbParameter("file", Data.OleDb.OleDbType.Binary) para.Value = Me.FileUpload1.FileBytes dc.Parameters.Add(para) '运行(通过 Parameters 将文件存储到数据库) dc.ExecuteNonQuery() ShowAlertMsg("上传文件存储完毕!") Else ShowAlertMsg("上传文件不存在!") End If
上传至数据库中的文件,可以通过下面的方式重新下载回来,请特别这注意这张网页在调用的时候必须提供文件编号做为URL中的命令行参数:
Me.AccessDataSource1.SelectCommand = "select * from FileStorage where uid=" & Request.QueryString("FileID") Dim dv As Data.DataView = Me.AccessDataSource1.Select(New DataSourceSelectArguments) '准备下载文件 Response.ClearHeaders() Response.Clear() Response.Expires = 0 Response.Buffer = True Dim fileName As String = dv.Item(0).Item("FileName") '通过 Header 设定文件名 Response.AddHeader("content-disposition", "attachment; filename=" & Chr(34) & System.Web.HttpUtility.UrlEncode(IO.Path.GetFileName(fileName), System.Text.Encoding.UTF8) & Chr(34)) Response.ContentType = "Application/octet-stream" '传出要让使用者下载的内容 Response.BinaryWrite(dv.Item(0).Item("FileBody")) '释放资源 Response.End()
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