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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-9991" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-8c790a68-ebd0-40ab-9596-8c2cdacf8edf" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9991" style="color: #3b73af; text-decoration: none">HHH-9991</a>
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Affects Versions:
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4.3.10
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Unassigned
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hibernate_converter_set.zip
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Created:
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28/Jul/2015 04:52 AM
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converter criteria
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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="fgaule" id="email_fgaule" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=fgaule" style="color:#6c797f;; color: #3b73af; text-decoration: none">Federico Gaule</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Trying to filter a query by an attribute with @Convert is failling. I have tried to find a workaround with no success. </p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The case is simple (attached), there is a class with an attribute of type Set. This attribute is wanted to be saved as a String (VARCHAR) in database. </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">
@Entity
<span class="code-keyword" style="color: #000091">public</span> class MyEntity {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
<span class="code-keyword" style="color: #000091">private</span> Set<<span class="code-object" style="color: #910091">String</span>> teams;
<span class="code-keyword" style="color: #000091">public</span> MyEntity() {
}
<span class="code-keyword" style="color: #000091">public</span> MyEntity(Set<<span class="code-object" style="color: #910091">String</span>> teams) {
<span class="code-keyword" style="color: #000091">this</span>.teams = teams;
}
@Id
@GeneratedValue
@Column(name=<span class="code-quote" style="color: #009100">"ID"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> getId() {
<span class="code-keyword" style="color: #000091">return</span> id;
}
<span class="code-keyword" style="color: #000091">public</span> void setId(<span class="code-object" style="color: #910091">Long</span> id) {
<span class="code-keyword" style="color: #000091">this</span>.id = id;
}
@Convert(converter = TeamsConverter.class)
@Column(name = <span class="code-quote" style="color: #009100">"MY_ENTITY_FIELDS"</span>)
<span class="code-keyword" style="color: #000091">public</span> Set<<span class="code-object" style="color: #910091">String</span>> getTeams() {
<span class="code-keyword" style="color: #000091">return</span> teams;
}
<span class="code-keyword" style="color: #000091">public</span> void setTeams(Set<<span class="code-object" style="color: #910091">String</span>> teams) {
<span class="code-keyword" style="color: #000091">this</span>.teams = teams;
}
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Converter translates from Set to String and viceversa</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">
@Converter
<span class="code-keyword" style="color: #000091">public</span> class TeamsConverter <span class="code-keyword" style="color: #000091">implements</span> AttributeConverter<Set, <span class="code-object" style="color: #910091">String</span>> {
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> convertToDatabaseColumn(Set set) {
<span class="code-keyword" style="color: #000091">return</span> set == <span class="code-keyword" style="color: #000091">null</span> ? <span class="code-keyword" style="color: #000091">null</span> : <span class="code-object" style="color: #910091">String</span>.join(<span class="code-quote" style="color: #009100">"|"</span>, set);
}
<span class="code-keyword" style="color: #000091">public</span> Set convertToEntityAttribute(<span class="code-object" style="color: #910091">String</span> s) {
HashSet set = <span class="code-keyword" style="color: #000091">new</span> HashSet();
<span class="code-keyword" style="color: #000091">if</span> (s != <span class="code-keyword" style="color: #000091">null</span>) {
<span class="code-keyword" style="color: #000091">for</span> (<span class="code-object" style="color: #910091">String</span> splitted : s.split(<span class="code-quote" style="color: #009100">"|"</span>)) {
set.add(splitted);
}
}
<span class="code-keyword" style="color: #000091">return</span> set;
}
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have tried 3 ways of doing this leading me to open this issue:</p>
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isMember
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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"> q.where(cb.isMember(<span class="code-quote" style="color: #009100">"CAI"</span>, c.<Set<<span class="code-object" style="color: #910091">String</span>>>get(<span class="code-quote" style="color: #009100">"teams"</span>))); </pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> //java.lang.IllegalArgumentException: unknown collection expression type <span class="error">[org.hibernate.jpa.criteria.path.SingularAttributePath]</span></p>
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equalToSet
<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">
Set<<span class="code-object" style="color: #910091">String</span>> a = <span class="code-keyword" style="color: #000091">new</span> HashSet<<span class="code-object" style="color: #910091">String</span>>();
a.add(<span class="code-quote" style="color: #009100">"CAI"</span>);
q.where(cb.equal(c.get(<span class="code-quote" style="color: #009100">"teams"</span>), a));
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> // java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Set</p>
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<li>
equalToString
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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"> q.where(cb.equal(c.get(<span class="code-quote" style="color: #009100">"teams"</span>), <span class="code-quote" style="color: #009100">"CAI"</span>)); </pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> // java.lang.IllegalArgumentException: Parameter value <span class="error">[CAI]</span> did not match expected type <span class="error">[java.util.Set (n/a)]</span></p>
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