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cecmaho
 Post subject: How to randomly get objects from a Set
PostPosted: Mon Sep 08, 2003 11:46 pm 
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Joined: Tue Aug 26, 2003 11:33 pm
Posts: 38
I need to randomly fetch records from a table. In hibernate, this seems only possible with ScrollableResults which has a method scoll() to skip certain number of records. This is not so convenient cause I must reset to the first whenever I wanna fetch the Nth record.
Does anyone know some way on how to get Nth element directly from a result Set/List without using iterator? Iterators has bad performance because we are not even skipping but loading and discarding.
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gavin
 Post subject:
PostPosted: Tue Sep 09, 2003 12:04 am 
Hibernate Team
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Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
From a Set??! I don't understand what the "nth element of a Set would mean" .... do you mean an _ordered_ set? Even then it seems a very dodgy notion....


In the case of a List or Map, and in Hibernate 2.1, you can use the standard HQL index() function.
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cecmaho
 Post subject: obscure in fact ;)
PostPosted: Tue Sep 09, 2003 1:17 am 
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Joined: Tue Aug 26, 2003 11:33 pm
Posts: 38
Which is faster ? I mean ScollableResults and HQL index() function.
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gavin
 Post subject:
PostPosted: Tue Sep 09, 2003 1:20 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
The index() function, of course. It does the work server-side.
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cecmaho
 Post subject: Thank you ! gavin
PostPosted: Tue Sep 09, 2003 1:25 am 
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Joined: Tue Aug 26, 2003 11:33 pm
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:)
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