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From "KARR, DAVID (ATTCINW)" <dk0...@att.com>
Subject RE: Issues mapping numerous tables to a single entity?
Date Sat, 05 Dec 2009 19:25:01 GMT
> -----Original Message-----
> From: KARR, DAVID (ATTCINW)
> Sent: Friday, December 04, 2009 4:46 PM
> To: users@openjpa.apache.org
> Subject: Issues mapping numerous tables to a single entity?
> 
> In Hibernate and JPA, I'm used to looking at scenarios where I map a
> single table to a single entity, along with relationships to other
> entities with various multiplicities.
> 
> I'm now looking at a situation where I'm going to need to develop a
JPA
> mapping for a pretty large collection of entities, where the largest
> entities actually are defined by an aggregation of numerous tables
> (like
> 20).  What provisions are there in JPA and OpenJPA for mapping
multiple
> tables to a single entity?  I'm not talking about an inheritance
> hierarchy, but where the numerous tables are linked by a common PK
> value.

I think I figured this out.  Using "secondary-table" for all but one
table, and having each "column" reference the table it's in, should
cover it.

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