图片数据存入数据库：
sqlstr="select * from "&tbname&" where id is null"
set rs=server.createobject("adodb.recordset")
rs.Open sqlstr,conn,1,3
rs.AddNew ()
rs("title")=title
rs("filename")=filename
rs("filetype")=filetype
rs("thelevel")=thelevel
rs("uploaddate")=date()
rs("uploadip")=request.ServerVariables("REMOTE_ADDR")
rs("contenttype")=contenttype
rs("data").AppendChunk (binstr)
rs("size")=size
rs("offset")=offset
rs.Update
rs.Close()
读取显示：
rs.Open sqlstr,conn,3
if not rs.EOF then
contenttype=rs("contenttype")
binstr=rs("data").GetChunk(rs("size")+rs("offset"))
if rs("offset")=1 then
binstr=midb(binstr,2)
end if
if instr(contenttype,"text/")=1 or _
instr(contenttype,"image/")=1 or _
instr(contenttype,"application/msword")=1 then
response.contenttype=trim(contenttype)
response.binarywrite binstr
else
response.addheader "Content-Disposition","attachment;filename="""&rs("filename")&""""
response.contenttype=trim(contenttype)
response.binarywrite binstr
end if
if request("preview")<>"yes" then
sqlstr="update "&tbname&" set downtimes=downtimes+1 where id="&fileid
conn.Execute sqlstr
end if
end if
说明：
对于超长的二进制数据（如图像数据）要使用fieldname.AppendChunk() 和fieldname.GetChunk()来读写。
