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From Tino Schöllhorn <t.schoellh...@plattform-gmbh.de>
Subject Re: Optimizing object materialization for 1:N relations
Date Thu, 07 Feb 2008 09:22:01 GMT
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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