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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">The documentation is maybe just a little unclear in regards to your reading of that 475 example. If you look more closely it actually shows just the initial query being performed, no join. Obviously to join fetch an assoctiation via a native SQL query, that SQL query is going to need to specify the join; that's the whole point of a native SQL query - the query Hibernate sends is defined completely by the user. </p> <p style="margin: 10px 0 0">So IMO the documentation does not suggest that the 475 example specifically "<span class="error">[handles]</span> many-to-one associations <span class="error">[avoiding]</span> extra roundtrip to initializing them." If you look at the sent SQL clearly that will not be the case. I agree the wording could be cleaned up though.</p> <p style="margin: 10px 0 0">Also your example is distinctly different from the 475 example. The 475 example does not access the associated entity, while your test does. The query for the associated state is only performed when the associated entity is accessed (when you call a getter/setter on that associated entity). That is consistent with the 475 example. And in fact if you alter your test case to mirror the doc example (change your line 63 from <tt>ph.getOwner().getName()</tt> to <tt>ph.getOwner()</tt>) you will see the same output</p> <p style="margin: 10px 0 0">To perform what you want, Hibernate defines a way to achieve that both via its native query support as well as via JPA's defined support. But both require that you explicitly tell Hibernate (or the JPA provider in general for JPA support) that the query contains a join fetch. Example 476 is an example of achieving that result via the Hibernate specific API. Unfortunately its displayed output query is incorrect; as the provided SQL query contains the join, what Hibernate sends to the DB will also contain the join. For the most part, the provided query is sent to the database directly as-is. The "magic" in the Hibernate API is the <tt>#addJoin( "pr", "phone.person")</tt> piece.</p> <p style="margin: 10px 0 0">As far as JPA's native SQL support, the JPA spec explicitly says that "a SqlResultSetMapping metadata definition must be provided to specify the entity mapping" in such cases.</p> <p style="margin: 10px 0 0">Like I said though, I agree that the section could be worded more clearly and some examples (476 at least) should be corrected.</p> <p style="margin: 10px 0 0"><a href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" class="user-hover" rel="mih_vlad" style="color: #3b73af; text-decoration: none">Vlad Mihalcea</a> can you take this one?</p> </td>
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