ASP implementation method to prevent duplicate submission data

The code is as follows	Copy Code
Session (' Time ') =now () Const a= #0:0:4# ' defines the number of seconds between intervals If session ("Time2") >0 then ' if a value If session ("Time2") +a > Sessions ("Time") Then ' Session ("Time2") =now () Response.Redirect "Look.asp" End If End If Session ("Time2") =now ()

Method Two

Make a counter on this page

The code is as follows	Copy Code
<% If request ("form content") = "" Then Session ("num") =0 Else Session ("Num") =session ("num") +1 End If ' After submission If session ("num") >0 Then Response.Write "Do not submit data again!" Response.End End If %>

Method Three

Use cookies or sessions to process. Here is an example of a cookie:
Add.asp

code is as follows

copy code

<% Response.Cookies ("submitflag") = "no"%> save.asp <% If Request.Cookies ("submitflag") = "yes" Then     Response.Write "You cannot submit data repeatedly!"     response.end End If Rs. AddNew ... Rs.update Rs.close Response.Cookies ("submitflag") = "yes" %> Database operation Set rs= Conn.execute ("Select top 1 txt from DB where txt= '" &reqtxt& ") If not (rs.eof Or rs.bof) then   Respon Se.write "Do not allow duplicate commits" Else   Add data .... End If