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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-10390" style="color: #3b73af; text-decoration: none">Re: Allow for populating child collections based on native query results only</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">I added a solution for this issue on <a href="https://github.com/vladmihalcea/high-performance-java-persistence/blob/master/core/src/test/java/com/vladmihalcea/book/hpjp/hibernate/association/TreeTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">GitHub</a>.</p> <p style="margin: 10px 0 0 0">Basically, we need to disable the collection fetching mechanism and override its mechanism like in the following result set transformer example:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Node root = (Node) doInHibernate(session -> {
<span class="code-keyword" style="color: #000091">return</span> session
.createSQLQuery(
<span class="code-quote" style="color: #009100">"SELECT * "</span> +
<span class="code-quote" style="color: #009100">"FROM Node "</span> +
<span class="code-quote" style="color: #009100">"CONNECT BY PRIOR id = parent_id "</span> +
<span class="code-quote" style="color: #009100">"START WITH parent_id IS NULL "</span>)
.addEntity(Node.class)
.setResultTransformer(<span class="code-keyword" style="color: #000091">new</span> ResultTransformer() {
@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Object</span> transformTuple(<span class="code-object" style="color: #910091">Object</span>[] tuple, <span class="code-object" style="color: #910091">String</span>[] aliases) {
Node node = (Node) tuple[0];
<span class="code-keyword" style="color: #000091">if</span>(node.parent != <span class="code-keyword" style="color: #000091">null</span>) {
node.parent.addChild(node);
}
<span class="code-keyword" style="color: #000091">return</span> node;
}
@Override
<span class="code-keyword" style="color: #000091">public</span> List transformList(List collection) {
<span class="code-keyword" style="color: #000091">return</span> Collections.singletonList(collection.get(0));
}
})
.uniqueResult();
});
</pre>
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</div> <p style="margin: 10px 0 0 0">This requires some modifications in the hibernate-core because this cannot work if the children association is a @OneToMany association, as it will trigger an additional query upon being traversed.</p> </td>
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