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<td class="page-title-pattern-first-line " style="padding: 0; 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-11525" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-dd99f354-63db-475e-9712-c605632e2ea2" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11525" style="color: #3b73af; text-decoration: none">HHH-11525</a> </td>
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<td style="vertical-align: top;; padding: 0; 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-11525" style="color: #3b73af; text-decoration: none">Allow specifying join table's primary key name through a unique constraint.</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-dd99f354-63db-475e-9712-c605632e2ea2" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 27/Feb/2017 08:05 AM </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="crancran" id="email_crancran" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=crancran" style="color:#6c797f;; color: #3b73af; text-decoration: none">Chris Cranford</a> </td>
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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-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">When specifying a unique constraint on a join table, if the columns of the constraint match that of the primary key generated for the join table, the unique constraint will be removed based on the following documentation in <tt>org.hibernate.mapping.Table#cleanseUniqueKeyMap()</tt>:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// We need to account <span class="code-keyword" style="color: #000091; color: #808080">for</span> a few conditions here...
</span><span class="code-comment" style="color: #808080">// 1) If there are multiple unique keys contained in the uniqueKeys Map, we need to deduplicate
</span><span class="code-comment" style="color: #808080">// any sharing the same columns as other defined unique keys; <span class="code-keyword" style="color: #000091; color: #808080">this</span> is needed <span class="code-keyword" style="color: #000091; color: #808080">for</span> the annotation
</span><span class="code-comment" style="color: #808080">// processor since it creates unique constraints automagically <span class="code-keyword" style="color: #000091; color: #808080">for</span> the user
</span><span class="code-comment" style="color: #808080">// 2) Remove any unique keys that share the same columns as the primary key; again, <span class="code-keyword" style="color: #000091; color: #808080">this</span> is
</span><span class="code-comment" style="color: #808080">// needed <span class="code-keyword" style="color: #000091; color: #808080">for</span> the annotation processor to handle @Id @OneToOne cases. In such cases the
</span><span class="code-comment" style="color: #808080">// unique key is unnecessary because a primary key is already unique by definition. We handle
</span><span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">this</span> <span class="code-keyword" style="color: #000091; color: #808080">case</span> specifically because some databases fail <span class="code-keyword" style="color: #000091; color: #808080">if</span> you <span class="code-keyword" style="color: #000091; color: #808080">try</span> to apply a unique key to
</span><span class="code-comment" style="color: #808080">// the primary key columns which causes schema export to fail in these cases.</span>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For situations where a unique constraint has a user specified name and the columns map to those of the join-table's primary key, allow that constraint name to influence the primary key's name instead.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We should document this and clearly indicate that depending on the dialect, some databases don't permit named primary keys and in those cases, the name will still be dropped and ignored.</p> </td>
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