Re: unique ascending numbers
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 50181
interpreted = N
texte = Marc Kaiwi wrote: > Humm, I was hoping to avoid throwing in an extra search just to retrieve > the last SKU number in the db. (I have a thing about extra processing > simply because it's easy)There is no reason you cannot use the [cart] even if it is of varying length. The [cart] is guaranteed to be unique, no matter how many people are hitting the site at the exact same instant. I wouldn't get too wrapped up in recreating that particular wheel.> > Can't I get something like the number of seconds since 1904 or something > like that? Wouldn't that work for me? Or not?Mac epoch, huh? Apart from the fact that the Mac epoch is truly evil[1], I believe the cart code uses the Unix epoch as it's base number.John[1] the Mac epoch is defined as the number of seconds since 1904-01-01 00:00:00 _local time_. The problem is that an epoch is supposed to be a fixed point in time that can be referred to uniquely all over the planet; the Mac epoch is floating so that it is impossible to use to reference events in time that occur in different timezones.-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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Marc Kaiwi wrote: > Humm, I was hoping to avoid throwing in an extra search just to retrieve > the last SKU number in the db. (I have a thing about extra processing > simply because it's easy)There is no reason you cannot use the [cart] even if it is of varying length. The [cart] is guaranteed to be unique, no matter how many people are hitting the site at the exact same instant. I wouldn't get too wrapped up in recreating that particular wheel.> > Can't I get something like the number of seconds since 1904 or something > like that? Wouldn't that work for me? Or not?Mac epoch, huh? Apart from the fact that the Mac epoch is truly evil[1], I believe the cart code uses the Unix epoch as it's base number.John[1] the Mac epoch is defined as the number of seconds since 1904-01-01 00:00:00 _local time_. The problem is that an epoch is supposed to be a fixed point in time that can be referred to uniquely all over the planet; the Mac epoch is floating so that it is impossible to use to reference events in time that occur in different timezones.-- John Peacock Director of Information Research and Technology Rowman & Littlefield Publishing Group 4501 Forbes Boulevard Suite H Lanham, MD 20706 301-459-3366 x.5010 fax 301-429-5748 ------------------------------------------------------------- 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://webdna.smithmicro.com/
John Peacock
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