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纯ASP上传图像文件到数据库的最佳例子

...

-------------------------
<html>

<head>
<title>保存图片到数据库</title>
</head>

<body>
<b>

<p></b>你可以找个图片试试,保存完毕后会有提示</p>

<form METHOD="POST" ENCTYPE="multipart/form-data" ACTION="savetodb.asp">
 <p>Email : <input NAME="email" VALUE="wangcq@sina.com" size="20">

 Picture : <input TYPE="file" NAME="blob">

 <input TYPE="submit" NAME="Enter"> </p>
</form>
</body>
</html>

savetodb.asp
----------------------------------
<%

Response.Buffer = TRUE
Response.Clear
byteCount = Request.TotalBytes

RequestBin = Request.BinaryRead(byteCount)
Dim UploadRequest
Set UploadRequest = CreateObject("Scripting.Dictionary")

BuildUploadRequest RequestBin

email = UploadRequest.Item("email").Item("Value")

contentType = UploadRequest.Item("blob").Item("ContentType")
filepathname = UploadRequest.Item("blob").Item("FileName")
filename = Right(filepathname,Len(filepathname)-InstrRev(filepathname,"\"))
picture = UploadRequest.Item("blob").Item("Value")

'Response.ContentType = contentType
'Response.binaryWrite picture

set objCn = server.createobject("adodb.connection")
set objRst = server.createobject("adodb.recordset")
objCn.Open "upload"
objrst.Open "pic", objcn, 1,3,2
objrst.addnew
objrst.fields("filename")=filename
objrst.fields("type")="gif"

objrst.fields("what").appendchunk picture
objrst.update
response.write "<a href=showpic.asp?id=" & objrst("id") & ">第" & objrst("id") & "个图片。</a>"
objrst.close

objCn.close
set objrst=nothing
set objcn = nothing
%>
<!--#include file="upload.asp"-->

showpic.asp
----------------------------------------
<%
set objCn = server.createobject("adodb.connection")
set objRst = server.createobject("adodb.recordset")
objCn.Open "upload"
objrst.Open "select what from pic where id=" & request("id"), objcn

if not objrst.eof then
  response.binarywrite objrst("what")
end if

objrst.close
objCn.close
set objrst=nothing
set objcn = nothing
%>


upload.asp
-------------------------------------------
<%
Sub BuildUploadRequest(RequestBin)
  'Get the boundary
  PosBeg = 1
  PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(13)))
  boundary = MidB(RequestBin,PosBeg,PosEnd-PosBeg)
  boundaryPos = InstrB(1,RequestBin,boundary)
  'Get all data inside the boundaries
  Do until (boundaryPos=InstrB(RequestBin,boundary & getByteString("--")))
    'Members variable of objects are put in a dictionary object
    Dim UploadControl
    Set UploadControl = CreateObject("Scripting.Dictionary")
    'Get an object name
    Pos = InstrB(BoundaryPos,RequestBin,getByteString("Content-Disposition"))
    Pos = InstrB(Pos,RequestBin,getByteString("name="))
    PosBeg = Pos+6
    PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(34)))
    Name = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg))
    PosFile = InstrB(BoundaryPos,RequestBin,getByteString("filename="))
    PosBound = InstrB(PosEnd,RequestBin,boundary)
    'Test if object is of file type
    If PosFile<>0 AND (PosFile<PosBound) Then
      'Get Filename, content-type and content of file
      PosBeg = PosFile + 10
      PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(34)))
      FileName = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg))
      'Add filename to dictionary object
      UploadControl.Add "FileName", FileName
      Pos = InstrB(PosEnd,RequestBin,getByteString("Content-Type:"))
      PosBeg = Pos+14
      PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(13)))
      'Add content-type to dictionary object
      ContentType = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg))
      UploadControl.Add "ContentType",ContentType
      'Get content of object
      PosBeg = PosEnd+4
      PosEnd = InstrB(PosBeg,RequestBin,boundary)-2
      Value = MidB(RequestBin,PosBeg,PosEnd-PosBeg)
      Else
      'Get content of object
      Pos = InstrB(Pos,RequestBin,getByteString(chr(13)))
      PosBeg = Pos+4
      PosEnd = InstrB(PosBeg,RequestBin,boundary)-2
      Value = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg))
    End If
    'Add content to dictionary object
  UploadControl.Add "Value" , Value  
    'Add dictionary object to main dictionary
  UploadRequest.Add name, UploadControl  
    'Loop to next object
    BoundaryPos=InstrB(BoundaryPos+LenB(boundary),RequestBin,boundary)
  Loop

End Sub

'String to byte string conversion
Function getByteString(StringStr)
For i = 1 to Len(StringStr)
   char = Mid(StringStr,i,1)
  getByteString = getByteString & chrB(AscB(char))
Next
End Function

'Byte string to string conversion
Function getString(StringBin)
getString =""
For intCount = 1 to LenB(StringBin)
  getString = getString & chr(AscB(MidB(StringBin,intCount,1)))
Next
End Function
%>

test.mdb(dsn 名称:upload)
----------------------------------------
表pic:
id:自动加
filename:文本
type:文本
what:ole

-----------------------------------------
存成单个文件,放在一个目录下,打开(必须用http://...)getfile.htm
上传一个.gif或.jpg就可以显示了。
对于大文件在显示程序(showpic.asp)中可能会用到循环和getchunk方法。自己去做。记住,由于ASP目前暂时不支持二进行制读写,只能存二进制到数据库中。
有什么问题,请致电veryblue@chinese.com (IAmTrue)

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