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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-12943" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-bd9ac344-64d1-44cf-9cdc-d077f5141a3d" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12943" style="color: #3b73af; text-decoration: none">HHH-12943</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-12943" style="color: #3b73af; text-decoration: none">SQL Server UNIQUEIDENTIFIER type uses an uppercase UUID String representation</a> </span> </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">Issue Type:</th>
<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-bd9ac344-64d1-44cf-9cdc-d077f5141a3d" 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">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.5 </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="mih_vlad" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vlad Mihalcea</a> </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">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </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"> 03/Sep/2018 00:24 AM </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-static-major-594d48e7-dcca-479f-9716-4f4cfdf6315b" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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="mih_vlad" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vlad Mihalcea</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">As documented in <a href="https://discourse.hibernate.org/t/string-uuid2-vs-ms-sql-uniqueidentifier/1329" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">this forum thread</a>, SQL Server uses an uppercase representation for UUIDs.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If we use the <tt>UUID</tt> or <tt>byte[]</tt> UUID identifiers, everything works just fine. But if we use a <tt>String</tt> identifier, then the <tt>UUID.toString()</tt> will return a lowercase String representation (which is according to the UUID specs). However, SQL Server uses an uppercase UUID String representation, and this can cause issues when fetching FK associations.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">After analyzing this issue, I came to realize that, instead of fixing anything in Hibernate, the user can workaround this SQL Server limitation by using an uppercase identifier:</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">
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"foo"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">class </span>FooEntity {
@Id
@GenericGenerator(name = <span class="code-quote" style="color: #009100">"uuid"</span>, strategy = <span class="code-quote" style="color: #009100">"uuid2"</span>)
@GeneratedValue(generator = <span class="code-quote" style="color: #009100">"uuid"</span>)
@Column(columnDefinition = <span class="code-quote" style="color: #009100">"UNIQUEIDENTIFIER"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;
@ElementCollection
@JoinTable(name = <span class="code-quote" style="color: #009100">"foo_values"</span>)
@Column(name = <span class="code-quote" style="color: #009100">"foo_value"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> Set<<span class="code-object" style="color: #910091">String</span>> fooValues = <span class="code-keyword" style="color: #000091">new</span> HashSet<>();
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id.toUpperCase();
}
<span class="code-keyword" style="color: #000091">public</span> void setId(<span class="code-object" style="color: #910091">String</span> id) {
<span class="code-keyword" style="color: #000091">this</span>.id = id;
}
<span class="code-keyword" style="color: #000091">public</span> Set<<span class="code-object" style="color: #910091">String</span>> getFooValues() {
<span class="code-keyword" style="color: #000091">return</span> fooValues;
}
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This will work for field-based access. For property-based access, you could use a <tt>byte[]</tt> for the identifier, and have a method to transform the byte[] to a String for the UI. Just make sure that, internally, the byte[] is used, not the String one.</p> </td>
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