no hilo and that are two different methods ... but you could pretty easily put them together ...
hilo generates a base 2 number (usually displayed as a base 10 number) just make it base 36 .... Cheers, Greg On Wed, Apr 15, 2009 at 1:37 PM, Caio Kinzel Filho <cai...@gmail.com> wrote: > > Is there a way I ensure that HiLo will generate for the 80bit key, > only combinations of letters/numbers? > > On Wed, Apr 15, 2009 at 2:18 PM, Greg Young <gregoryyou...@gmail.com> wrote: >> >> Assuming this is all so you can be occasionally connected and still >> generate an id >> >> do id checkouts ... say each occasionally connected client has 1000 >> ids and when they run out they check out new ones ... >> >> use things with enough randomness ... using letters helps with >> representing these ... you can fit a random 80 bit number into a much >> smaller character field (numbers/characters). Your chance of collision >> at 1/2^80 is small enough for most systems ... >> >> use something similar to nhibernate's hilo generator. >> >> Greg >> >> On Wed, Apr 15, 2009 at 1:12 PM, Caio Kinzel Filho <cai...@gmail.com> wrote: >>> >>> I agree with you on "generally they receive an id when they reach a >>> central system", >>> >>> but my scenario is a little bit different: >>> The "user" actually is a company operator, placing orders received by >>> phone for a customer. >>> The customer must receive an order id, for tracking purposes, etc >>> The order is placed but its state is not yet "Confirmed" ( _that_ will >>> happen when the order is processed by the central system) >>> >>> >>> On Wed, Apr 15, 2009 at 2:02 PM, Greg Young <gregoryyou...@gmail.com> wrote: >>>> >>>> Thsoe types of numbers are not generally created assigned in an >>>> occasionally connected system ... maybe I am misunderstanding you ... >>>> generally they receive an id when they reach a central system. >>>> >>>> On Wed, Apr 15, 2009 at 1:00 PM, Caio Kinzel Filho <cai...@gmail.com> >>>> wrote: >>>>> >>>>> One scenario: >>>>> A user post an order, and receives as a confirmation, an order number >>>>> (which must be unique and so, it's my primary key). >>>>> It would be akward to see something like: >>>>> >>>>> "Your order is: 3F2504E0-4F89-11D3-9A0C-0305E82C3301" >>>>> >>>>> >>>>> On Wed, Apr 15, 2009 at 1:56 PM, Greg Young <gregoryyou...@gmail.com> >>>>> wrote: >>>>>> >>>>>> Why do you want human readable keys? >>>>>> >>>>>> On Wed, Apr 15, 2009 at 12:53 PM, caiokf <cai...@gmail.com> wrote: >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> Which approach do you guys suggest to handle Primary Keys in an >>>>>>> occasionally connected system? >>>>>>> >>>>>>> In my understanding, the options are: >>>>>>> >>>>>>> - GUIDs/UUIDs : which present a non-human readable key, which I want >>>>>>> to avoid. >>>>>>> - AppID, ID: difficult to mantain the AppID for all the clients, and I >>>>>>> think it kind of polute my domain. >>>>>>> - Some sort of Primary Key Pool: how could I integrate that with >>>>>>> NHibernate in a (most) transparent way (as possible)? >>>>>>> >>>>>>> If someone has some other suggestion or stories about that matter, it >>>>>>> would be very helpfull. >>>>>>> >>>>>>> Thanks, >>>>>>> Caio >>>>>>> > >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> It is the mark of an educated mind to be able to entertain a thought >>>>>> without accepting it. >>>>>> >>>>>> > >>>>>> >>>>> >>>>> > >>>>> >>>> >>>> >>>> >>>> -- >>>> It is the mark of an educated mind to be able to entertain a thought >>>> without accepting it. >>>> >>>> > >>>> >>> >>> > >>> >> >> >> >> -- >> It is the mark of an educated mind to be able to entertain a thought >> without accepting it. >> >> > >> > > > > -- It is the mark of an educated mind to be able to entertain a thought without accepting it. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to nhusers@googlegroups.com To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
