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From David Van Couvering <da...@vancouvering.com>
Subject Re: Using Derby as a binary store
Date Mon, 27 Nov 2006 19:31:12 GMT
To be honest, this looks more like a job for BDB than for Derby.  I 
would love to see the Derby store API made public at some point, but 
currently it's not public and I suspect it may be difficult to work 
with.  Are there reasons BDB/Java won't work for you?

David

Kasper Nielsen wrote:
> Julius.Stroffek wrote:
>> Do you need to store them also on a disk?
>>
>> Cheers
>>
>> Julo
> Yes,
> 
> I'm only interested in the actual storage/indexing. Any caching I'll 
> take of myself.
> 
> Let's for simplicity's sake say I need the following interface in my 
> application.
> 
> interface Store {
>   void put(byte[] key, byte[] value);
>   byte[] get(byte[] key);
>   Map<byte[], byte[]> getRange(byte[] key_from, byte[] key_to);
> }
> 
> put and get works like the java.util.Map put/get operation.
> getRange(83,103) would return all the existing key->value bindings for 
> numbers between 83 and 103.
> 
> I could implement this myself, but I would like to use the 
> indexing/transactional features of Derby instead. However, I'm not 
> willing to pay the performance cost for using SQL since I'm only storing 
> byte[] arrays (if it is possible).
> 
> Cheers
>   Kasper
> 
>>
>> Kasper Nielsen wrote:
>>> I'm just looking for a lightweight solution where I can store bytes 
>>> (key->value pairs) and create a few indexes on the data.
>>>
>>>
>>> Cheers
>>>   Kasper
>>>
>>>
>>>> On 11/24/06, Kasper Nielsen <news@kav.dk> wrote:
>>>>> Hi,
>>>>>
>>>>> I'm evaluating Derby for a project of mine. I really would like to 
>>>>> avoid
>>>>> using SQL and just use Derby as a binary store. Is this possible?
>>>>>
>>>>> My data consists of key -> value pairs where the keys are uniformly
>>>>> distributed 160 bit numbers and the values are byte arrays.
>>>>>
>>>>> For now, I need to support 2 basic queries
>>>>> * Give me the value mapping for the key K or null if it doesn't exist.
>>>>> * Give me a map of (key->value)  for the key range of key_start to

>>>>> key_end.
>>>>>
>>>>> I had a look at the org.apache.derby.iap.store packages but wasn't 
>>>>> quite
>>>>> sure where to start.
>>>>>
>>>>> Cheers
>>>>>   Kasper
>>>>>
>>>>
>>>
>>
> 
> 

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