Engine to generate random alphanumeric characters 4 DB

Posted on 2001-07-25
Last Modified: 2012-05-04
I need an engine that will randomly produce up to 10 alphanumeric characters later to be stored in a table of my SQL2000 db. Here's a run down on how I plan to use it:

I have a SQL2000 database web site that will have the ability to use CDONTS to send email. Within this email that gets sent will be 3 session variables and one URL. The url will return the person who gets the email to a 'hidden' record within the database that points to some information about the email sender. I paln on appending values to the url to make it complete.

So in the email you'd see:

The is something I have in the message body of the email with the value abcdef1234 added to it.

When you click on it, your taken to web page abcdef1234.asp and you can see the data stored on that page.

This value (abcdef1234) should first get set in the table when a user creates an account for the first time. So for example:


Username, password, first name, and a hidden account code of abcdef1234 was generated when the person click the submit button...

The user doesn't see the hidden number, but is a session value, that I carry when the user logs in, and later clicks to apply on line.

I need this info to be unique, and random. If its not random, then any user could enter abcdef1235 and find the next users info.

Maybe someone could point me to a site that has something or if this is simple (and I?m making it too hard) to do in ASP, please let me know. Examples are certainly welcome. J

I?m opening this question at 125 points and depending how hard it becomes, I?ll adjust the points as we go.


Question by:JPersinger
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
  • 2
  • +2
LVL 11

Expert Comment

ID: 6318239
function createRandomPassword()
     dim x,y,z
     for x = 1 to 10
          while (y < 65 or (y > 90 and y < 97) OR (y > 122))
               y = round(rnd() * 122)
          z = z & chr(y)
     next 'x          
     set x = Nothing
     set y = Nothing
     createRandomPassword = z
     set z = Nothing
end function

Expert Comment

ID: 6318275
I would suggest not to use random values but rather use something that uses the date and time (timestamps).

To do this use the following:

<%UniqueKey = Date & Time

But since this will be a filename, you would maybe like to remove all unwanted characters, as well as spaces:

<%UniqueKey = Replace(UniqueKey, "/", "")
  UniqueKey = Replace(UniqueKey, "\", "")
  UniqueKey = Replace(UniqueKey, ":", "")
  UniqueKey = Replace(UniqueKey, " ", "")

  ... 'Whatever other might occur

  UniqueKey = UniqueKey & ".asp"

You can even use the IP Address together with the timestamp to create a more unique key.  Just remember to remove all unwanted characters (".").


I hope this helps.  Let me know
LVL 11

Expert Comment

ID: 6318289
What if two people subscribe at the same time?
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

LVL 28

Expert Comment

ID: 6318290
you want it to be unique too correct?  just create a GUID (globally unique identifier).  it is longer than 10 characters but it is gauranteed to be unique always:

guid = server.createobject("scriptlet.typelib").guid
response.write guid

the variable 'guid' can be used as your custom/unique/random value

Author Comment

ID: 6318303
WOW - You people are GREAT!!!!!!!!!!!!!!!!

I like the idea of the GUID...Let me try that and see how far I get...


Expert Comment

ID: 6318309
why not use the sessionID value
LVL 28

Expert Comment

ID: 6318337
i'm not positive, but under the covers, i believe the Session object creates its ID value using a GUID.  also, if you create your own GUID manually, there is no worries of users with cookies disabled.

Author Comment

ID: 6319242
The GUID seems to work good so far. Two quick questions:

1) Is there a way to remove the {} and
2) Is there a way to remove the - (dashes) in between the numbers before it posts to the DB?

Increased points to 135.

LVL 28

Accepted Solution

AzraSound earned 135 total points
ID: 6319284
sure, after creating the GUID, you can eliminate those extra characters:

guid = server.createobject("scriptlet.typelib").guid
guid = Replace(guid, "{", "")
guid = Replace(guid, "}", "")
guid = Replace(guid, "-", "")

'Update DB with guid


Author Comment

ID: 6319294

LVL 28

Expert Comment

ID: 6319351
glad i could help   :-)

Featured Post

[Webinar] Code, Load, and Grow

Managing multiple websites, servers, applications, and security on a daily basis? Join us for a webinar on May 25th to learn how to simplify administration and management of virtual hosts for IT admins, create a secure environment, and deploy code more effectively and frequently.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Html CheckBox obtain Its Value 5 43
My Do While is Not Producing Anything 15 87
VB script help 23 50
StoredProcedure to JSON query faulty syntax 2 45
I have helped a lot of people on EE with their coding sources and have enjoyed near about every minute of it. Sometimes it can get a little tedious but it is always a challenge and the one thing that I always say is:   The Exchange of informatio…
Have you ever needed to get an ASP script to wait for a while? I have, just to let something else happen. Or in my case, to allow other stuff to happen while I was murdering my MySQL database with an update. The Original Issue This was written…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question