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From Erik Hatcher <e...@ehatchersolutions.com>
Subject Re: Add unique id to a doc
Date Thu, 21 Jul 2005 20:20:11 GMT

On Jul 21, 2005, at 3:43 PM, Riccardo Daviddi wrote:
> What I want to to is to assign a unique id to each doc I add to the  
> index.
> I was wondering if there is a method to assign a unique id directly
> looking in the index so after I could store my doc in a db with the
> same id as key.

So first Lucene, then the DB?

How about generating a GUID for each document?  Or perhaps a digest  
of it's contents?

     Erik



>
> On 7/21/05, Erik Hatcher <erik@ehatchersolutions.com> wrote:
>
>> You could certainly use IndexReader to get the last document in the
>> index and retrieve its ID, but why?
>>
>> What use case do you have in mind for such id's?  Do they have a non-
>> arbitrary meaning?  Do your documents have nothing unique to identify
>> them already?
>>
>>      Erik
>>
>>
>> On Jul 21, 2005, at 11:53 AM, Riccardo Daviddi wrote:
>>
>>
>>> Hi all,
>>>
>>> it's possible to set an unique id (as keyword field) to a doc by
>>> looking in the index? I mean, it's possible to look in the index and
>>> know what is the last id (which is a keyword field) and then decide
>>> for the new id to associate to the new indexed doc? Or it's better
>>> store the doc in a db and get so a unique id (the key of the row in
>>> the db) and use it as the unique id for the keyword field in the
>>> index?
>>>
>>> --
>>> Riccardo Daviddi
>>>
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>>>
>>
>>
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>>
>>
>
>
> -- 
> Riccardo Daviddi
>
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