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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/OGM" style="color: #3b73af; text-decoration: none">Hibernate OGM</a> / <a href="https://hibernate.atlassian.net/browse/OGM-513" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-improvement-b894105e-2b3d-4aa9-b621-8d4667ff848d" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/OGM-513" style="color: #3b73af; text-decoration: none">OGM-513</a>
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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/OGM-513" style="color: #3b73af; text-decoration: none">Re-consider how native queries are expressed for MongoDB</a> </span>
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Issue Type:
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-improvement-b894105e-2b3d-4aa9-b621-8d4667ff848d" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /> Improvement
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Unassigned
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12/May/14 3:49 AM
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gunnar.morling" id="email_gunnar.morling" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gunnar.morling" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gunnar Morling</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Currently native queries for MongoDB are expressed like this:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-object" style="color: #910091">String</span> nativeQuery = <span class="code-quote" style="color: #009100">"{ $and: [ { name : 'Portia' }, { author : 'Oscar Wilde' } ] }"</span>;
Query query = em.createNativeQuery( nativeQuery, OscarWildePoem.class );
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">While this works for basic cases, there are some limitations:</p>
<ul>
<li>
projections can't be expressed
</li>
<li>
offset/limit can't be expressed
</li>
</ul>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">(The reason being that MongoDB has no "full" query language which would accept all required elements in one String, instead the different parts are to be passed as individual parameters to the driver API).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This could be avoided by accepting an "invocation" of MongoDB's JS find() API:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-object" style="color: #910091">String</span> nativeQuery = <span class="code-quote" style="color: #009100">"db.Poem.find("</span>
+ <span class="code-quote" style="color: #009100">"{ $and: [ { name : 'Portia' }, { author : 'Oscar Wilde' } ] },"</span> <span class="code-comment" style="color: #808080">//WHERE
</span> + <span class="code-quote" style="color: #009100">"{_id : 1, name : 1})."</span> <span class="code-comment" style="color: #808080">// SELECT / projection
</span> + <span class="code-quote" style="color: #009100">"skip(100).limit(100)"</span>;
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This would allow to retrieve the collection name from the actual query (today we derive it from the one and only entity result type set, which I believe gets semantics kind of backwards).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Scalar values could be mapped via <tt>SqlResultSetMapping</tt>/<tt>ColumnResult</tt>.</p>
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