Designing complex query builders in java/jpa/hibernate

Posted by Ramraj Edagutti on Programmers See other posts from Programmers or by Ramraj Edagutti
Published on 2012-04-14T04:21:48Z Indexed on 2012/04/14 11:44 UTC
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Filed under:

java

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design

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sql

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query

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jpa

I need to build complex sql queries programatically, based on large filter conditions.

For example, below are few sample/hypothitical filter conditions, based on which i need to fetch users

Country: india

States: Andhra Pradesh(AP), Gujarat(GUJ), karnataka(KTK)

Districts: All districts in AP except 3 district, 5 any districts from GUJ, all district from KTK except 1 district

Cities: All cities in AP, all cities except few, include only 50 specific cities from KTK

Villages: similar conditions like above with varies combinations...

Currently, we have a query builder, which is very complex in nature, and not easy to modify/re-factory for improvements. So, thinking of complete re-design of it.

Any suggesations on how to build this kind of complex query builders programmatically using some best practices/deisgn patterns?

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