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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/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9300" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-a3b977cb-2ca8-4f98-84fd-83ef4ed0652e" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9300" style="color: #3b73af; text-decoration: none">HHH-9300</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/HHH-9300" style="color: #3b73af; text-decoration: none">DB2Dialect generates invalid order by clause</a> </span>
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Issue Type:
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Affects Versions:
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4.2.6
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Unassigned
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Created:
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24/Jul/2014 06:06 AM
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Environment:
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DB2 9.7+
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Priority:
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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="christian.beikov" id="email_christian.beikov" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=christian.beikov" style="color:#6c797f;; color: #3b73af; text-decoration: none">Christian Beikov</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">As of DB2 9.7 the order by clause also supports NULLS FIRST/LAST but currently the DB2Dialect generates a wrong clause.<br /> The DB2 grammar allows NULLS LAST <b>only</b> if the order is ASC and NULLS FIRST <b>only</b> if the order is DESC.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">If i specify a query that uses ASC NULLS FIRST, the generated query includes the NULLS FIRST, although not required and also wrong. The DESC case is analog.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I propose to overload the method <b>renderOrderByElement</b> in the DB2Dialect to generate the right clause.</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-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> renderOrderByElement(<span class="code-object" style="color: #910091">String</span> expression, <span class="code-object" style="color: #910091">String</span> collation, <span class="code-object" style="color: #910091">String</span> order, NullPrecedence nulls) {
        <span class="code-keyword" style="color: #000091">final</span> StringBuilder orderByElement = <span class="code-keyword" style="color: #000091">new</span> StringBuilder(expression);
        <span class="code-keyword" style="color: #000091">if</span> (collation != <span class="code-keyword" style="color: #000091">null</span>) {
                orderByElement.append(<span class="code-quote" style="color: #009100">" "</span>).append(collation);
        }
        <span class="code-keyword" style="color: #000091">if</span> (order != <span class="code-keyword" style="color: #000091">null</span>) {
                orderByElement.append(<span class="code-quote" style="color: #009100">" "</span>).append(order);
        }
        <span class="code-keyword" style="color: #000091">if</span> ((<span class="code-quote" style="color: #009100">"asc"</span>.equals(order) && nulls == NullPrecedence.LAST) || (<span class="code-quote" style="color: #009100">"desc"</span>.equals(order) && nulls == NullPrecedence.FIRST)) {
                orderByElement.append(<span class="code-quote" style="color: #009100">" nulls "</span>).append(nulls.name().toLowerCase());
        }
        <span class="code-keyword" style="color: #000091">return</span> orderByElement.toString();
}
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