Re: [cart]'s ever get recycled?
This WebDNA talk-list message is from 2000
It keeps the original formatting.
numero = 31741
interpreted = N
texte = On 5/10/00 3:21 PM, Somebody asked:S >> SM (or anyone) can you *guarantee* that if I use cart numbers for a >> few hundred >> thousand recordIDs that in 10 years+ there will be no chance that >> when an admin creates >> a new record and goes to assign its ID that the [cart] will not load >> a duplicate that >> was used before?And Kenneth Grome at ken@simplewebstores.com suggested: > If you're that concerned about getting an absolutely unique value > every time, why don't you use a database to store the last number > used as a unique value, and increment it by one each time someone new > visits the site? You won't be able to use the [cart] tag if you do > this, so you won't have to be concerned about whether or not the > [cart] tag is going to give you what you want, because you'll be > dealing with that yourself ... :)My technique of choice is to create a record ID by slapping [cart] and [date %Y%m%d%H%M%S] together. Yes, this results in a number that looks like the National Debt, but it exponentially increases the number of possible unique numbers. You'd be hard-pressed to generate a duplicate value this way. Also, since WebCat treats everything as text anyway, you could even use the encrypt context to hash the [cart] value. As long as you provide a seed, the hash encrypt generates will be unique even if you crypt the same string multiple times. Providing a seed is key for this to work-- If you don't use one, the hash will be the same every time you crypt the same text, as if it were a password in your users.db.-- Andrew Vernon avernon@dramatols.net------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
. To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/
Associated Messages, from the most recent to the oldest:
On 5/10/00 3:21 PM, Somebody asked:S >> SM (or anyone) can you *guarantee* that if I use cart numbers for a >> few hundred >> thousand recordIDs that in 10 years+ there will be no chance that >> when an admin creates >> a new record and goes to assign its ID that the [cart] will not load >> a duplicate that >> was used before?And Kenneth Grome at ken@simplewebstores.com suggested: > If you're that concerned about getting an absolutely unique value > every time, why don't you use a database to store the last number > used as a unique value, and increment it by one each time someone new > visits the site? You won't be able to use the [cart] tag if you do > this, so you won't have to be concerned about whether or not the > [cart] tag is going to give you what you want, because you'll be > dealing with that yourself ... :)My technique of choice is to create a record ID by slapping [cart] and [date %Y%m%d%H%M%S] together. Yes, this results in a number that looks like the National Debt, but it exponentially increases the number of possible unique numbers. You'd be hard-pressed to generate a duplicate value this way. Also, since WebCat treats everything as text anyway, you could even use the encrypt context to hash the [cart] value. As long as you provide a seed, the hash encrypt generates will be unique even if you crypt the same string multiple times. Providing a seed is key for this to work-- If you don't use one, the hash will be the same every time you crypt the same text, as if it were a password in your users.db.-- Andrew Vernon avernon@dramatols.net------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/
Andrew Vernon
DOWNLOAD WEBDNA NOW!
Top Articles:
Talk List
The WebDNA community talk-list is the best place to get some help: several hundred extremely proficient programmers with an excellent knowledge of WebDNA and an excellent spirit will deliver all the tips and tricks you can imagine...
Related Readings:
read and write you own cookies with webcat (1997)
[AppendFile] problem (WebCat2b13 Mac .acgi) (1997)
WebMerchant Mac 3.0 beta available (1998)
Firesite cache vs webcat cache (1997)
Re:no template caching (1997)
[/application] error? (1997)
Domain serial issue (2008)
encrypt/decrypt (2001)
ThreadMem ignored? (1998)
Digest for 4/18/97 (1997)
Databases going to sleep (1998)
Problems with [Applescript] (1997)
[ModDate] & [ModTime] ? (1997)
mimeheaders to allow back button to work on a posted page? (2004)
Not reading code (1997)
[SendMail] from a form? (1998)
Next X hits (1996)
Running 2 two WebCatalog.acgi's (1996)
WebCat on Apache (2002)
emailer settings and control questions (1997)