[Hibernate] [ hibernate-Patches-688610 ] Fetch profiles

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Patches item #688610, was opened at 2003-02-18 21:45
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Konstantin Dmitriev (kdmitriev)
Assigned to: Nobody/Anonymous (nobody)
Summary: Fetch profiles

Initial Comment:
Here's my code for fetch profiles. No test case is 
currently developed (though I have my own). I hope you 
can test on your own model

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Comment By: Cameron Braid (cameronbraid)
Date: 2003-02-28 22:42

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that is most appreciated. Thanks

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-28 18:39

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SQL scripts to import test data

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Comment By: Cameron Braid (cameronbraid)
Date: 2003-02-28 00:18

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I would like to try this patch.

Though to do so I will need to insert a heap of data..

Do you have a dataset that can be added to the patch ?

I suggest that you use DBUnit's flat xml data set as they are 
quite easy to export / import.

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-21 18:51

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Sorry about one-to-one. works now

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-20 15:49

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Hello Chris

1. According to Max R. Andersen's request, fetch profiles are 
defined in a way similar to sessions.setClassFectchProfiles
(class1, "property1, property2"); i.e. not in the query

2. The whole thing is not about transparent eager loading 
lazy-loading proxies. It's about avoiding N+1. Quite different. I 
suggest you have a look at the patch and test cases

Thank you very much for your feedback

Best regards,
Konstantin Dmitriev

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Comment By: Chris Nokleberg (herbyderby)
Date: 2003-02-20 07:41

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Instead of parsing queries to determine what fields need to
be fetched, I suggest that fetch profiles only be allowed
for lazy-loading proxies. Accesses to the underlying getters
could be intercepted, mapped to a profile, and loaded if
necessary. Basically breaking up a lazy entity into distinct
subsets of properties, each of which get loaded
independently just-in-time.

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-19 23:53

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- added support for Maps
- added support for Collections of values
- various mappings added to the test model: list, map, bag, 
collection of values, one-to-one, many-to-many, component

one-to-one present a problem, because lazy load is not 
supported

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-18 22:38

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Now with the test case. It's for Oracle (Is it a problem?)

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Comment By: Konstantin Dmitriev (kdmitriev)
Date: 2003-02-18 22:28

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Where is the archive? Strange! Attaching again

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