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List:       ojb-user
Subject:    Re: Optimizing object materialization for 1:N relations
From:       Tino_Schöllhorn
Date:       2008-02-07 13:21:04
Message-ID: fof0k0$bjl$1 () ger ! gmane ! org
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Hi,

so I will try that. Thanks for your reply.

With regards
Tino

Danilo Tommasina schrieb:
> Hi Tino,
> 
> I think he meant, that you can load several ACLs with one query and use 
> prefetched relationships for loading all depending ACLEntries for each 
> loaded ACL.
> Also in this case you will have only 2 Queries, but you will bulk load 
> several ACLs
> 
> Bye
> danilo
> 
> Tino Schöllhorn wrote:
>> Hi Armin,
>>
>> thanks for your reply. Do you think it would be worth a try to 
>> materialize our objects with pure SQL - but after initializing them to 
>> work with them with OJB?
>>
>> Thanks for your opinion.
>>
>> Regards
>> Tino
>>
>> Armin Waibel schrieb:
>>> Hi Tino,
>>>
>>> Tino Schöllhorn wrote:
>>>> Hi,
>>>>
>>>> we are using OJB-1.0.1 and evertything works fine. Now I have the 
>>>> following situation:
>>>>
>>>> We have a security-mechanism which uses the classes ACL 
>>>> (AccessControlList) and ACLEntry. One ACL has many ACLEntries. Now  
>>>> when using the standard OJB-Materialization methods OJB uses 2 SQLs 
>>>> to materialize on ACL. One for the ACL and one for the ACLEntry.
>>>>
>>>> Because we have MANY of those ACLs I am curious if it is possible to 
>>>> overwrite the materialization-method so that just one SQL is used. I 
>>>> thought about using "Prefeteched Relationships" but I noticed that 
>>>> there are also 2 SQLs.
>>>
>>> The "Prefeteched Relationships" is useful if you search for more than 
>>> one ACL, then OJB is able to reduce the queries to read the ACLEntries:
>>> http://db.apache.org/ojb/docu/guides/query.html#prefetched+relationships
>>> The upcoming version 1.0.5 use "Prefeteched Relationships" for all 
>>> 1:n relations.
>>>
>>>>
>>>> Any ideas or even example how I could achieve that?
>>>>
>>>
>>> Sorry no.
>>>
>>> regards,
>>> Armin
>>>
>>>> Kind regards
>>>> Tino
>>>>
>>>>
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>>
>>
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