Query a Hibernate many-to-many association

Posted by Perry Hoekstra on Stack Overflow See other posts from Stack Overflow or by Perry Hoekstra
Published on 2010-05-17T16:30:49Z Indexed on 2010/05/17 17:20 UTC
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Filed under:

hibernate

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many-to-many

|

query

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association

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table

In Hibernate HQL, how would you query through a many-to-many association. If I have a Company with multiple ProductLines and other companies can offer these same product lines, I have a Company entity, a ProductLine entity and an association table CompanyProductLine. In SQL, I can get what I need like this:

select * from company c where c.companyId in (select companyId from companyProductLine cpl, productline pl where cpl.productLineId = pl.productLineId and pl.name= 'some value');

My problem sees to lie with the association I defined in the Company.hbm.xml file:

<set name="productLines" 
     cascade="save-update" 
     table="CompanyProductLine">
   <key column="companyId"/>
   <many-to-many class="com.foo.ProductLine" column="productLineId" />
</set>

Any HQL I seem to come up with will throw a: 'expecting 'elements' or 'indices"' Hibernate exception.

Thoughts on what the proper HQL would be?

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