You could also do this;
1) GET /db/my_counter_doc
1a) if 404, PUT /db/my_counter_doc -d '{"counter":0"}'
1b) if 200, PUT /db/my_counter_doc -d '{"counter":counter+N",
"_rev":"rev from 1a"}'
1c) repeat step 1 if 1b returned 409.
2) use numbers from counter to counter+N for doc ids.
This is a common alternative to using auto-increment columns in RDBMS's too.
B.
On Mon, Apr 19, 2010 at 1:57 PM, Sebastian Cohnen
<[email protected]> wrote:
> no, UUIDs need to be as unique as possible. couchdb's _uuid API guarantees a
> high entropy for the produced IDs. the problem with (short) numeric IDs is,
> that they are more likely to produce collisions. if you do not use
> replication, you can basically do this:
>
> 1) create a number on your client
> 2) try to insert your document using this id
> 3) if you get a conflict, goto 1)
> 4) if your insert was successful, you are done.
>
> the fundamental flaw to this approach is, that you more likely get conflicts
> when using replication (the shorter the IDs are, the more likely of course,
> see http://en.wikipedia.org/wiki/Birthday_attack#The_mathematics).
>
>
> On 19.04.2010, at 14:48, faust 1111 wrote:
>
>> is it possible send couch like /_uuids?count=10
>> and its return me short ids?
>>
>> 2010/4/19 faust 1111 <[email protected]>:
>>> I need autogenerated short ids.
>>> i try use rand(99999999) is it fine?
>>>
>>> 2010/4/19 David Coallier <[email protected]>:
>>>> On 19 April 2010 11:19, faust 1111 <[email protected]> wrote:
>>>>> yes i know that i can create my own ids
>>>>> but i am interesting in what way couch guy's solve this.
>>>>>
>>>>
>>>> Right... I'm not sure I exactly understand what you mean. Do you mean
>>>> how could one do that from within CouchDB using autogenerated IDs or
>>>> using something like "io" (http://github.com/janl/io) which is a short
>>>> url generator using CouchDB :)
>>>>
>>>>
>>>>
>>>> --
>>>> David Coallier
>>>>
>>>
>
>
