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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-12706" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-1a829f72-e322-43b0-a96d-d1046ea822ae" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12706" style="color: #3b73af; text-decoration: none">HHH-12706</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">Change By:</th>
<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="nikowitt" id="email_nikowitt" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=nikowitt" style="color:#6c797f;; color: #3b73af; text-decoration: none">Niko Wittenbeck</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"> <span class="diffaddedchars" style="background-color:#ddfade;">"</span> <span class="diffcontext">I'm playing with JPA criteria and result transformers, inspired by https://vladmihalcea.com/why-you-should-use-the-hibernate-resulttransformer-to-customize-result-set-mappings/</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\r\n</span> <span class="diffcontext">{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\tprivate</span> <span class="diffcontext"> static class IdDTO {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tprivate</span> <span class="diffcontext"> final int id;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\tprivate</span> <span class="diffcontext"> IdDTO(int id) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> this</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tthis</span> <span class="diffcontext">.id = id;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\tprivate</span> <span class="diffcontext"> static class UserDTO {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tprivate</span> <span class="diffcontext"> final int id;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tprivate</span> <span class="diffcontext"> final String name;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\tprivate</span> <span class="diffcontext"> UserDTO(int id, String name) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> this</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tthis</span> <span class="diffcontext">.id = id;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> this</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tthis</span> <span class="diffcontext">.name = name;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\tprivate</span> <span class="diffcontext"> static class IdResultTransformer implements ResultTransformer {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\t</span> <span class="diffcontext"> @Override</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> public</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tpublic</span> <span class="diffcontext"> Object transformTuple(Object[] tuple, String[] aliases) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> return</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\treturn</span> <span class="diffcontext"> new IdDTO((int) tuple[0]);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\t</span> <span class="diffcontext"> @Override</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> public</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tpublic</span> <span class="diffcontext"> List transformList(List collection) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> return</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\treturn</span> <span class="diffcontext"> collection;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br> private</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\tprivate</span> <span class="diffcontext"> static class UserResultTransformer implements ResultTransformer {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\t</span> <span class="diffcontext"> @Override</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> public</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tpublic</span> <span class="diffcontext"> Object transformTuple(Object[] tuple, String[] aliases) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> return</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\treturn</span> <span class="diffcontext"> new UserDTO((int) tuple[0], (String) tuple[1]);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n\t\t</span> <span class="diffcontext"> @Override</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> public</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\tpublic</span> <span class="diffcontext"> List transformList(List collection) {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> return</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\treturn</span> <span class="diffcontext"> collection;</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t</span> <span class="diffcontext"> }</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br>Using</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\nUsing</span> <span class="diffcontext"> the criteria builder, I can define a result transformer to my query when I only use a single select:</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n</span> <span class="diffcontext">{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br>doInOpenTransaction</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\ndoInOpenTransaction</span> <span class="diffcontext">((s, tx) -> {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> CriteriaQuery</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tCriteriaQuery</span> <span class="diffcontext"><User> q = s.getCriteriaBuilder().createQuery(User.class);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> Root</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tRoot</span> <span class="diffcontext"><User> root = q.from(User.class);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> q</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tq</span> <span class="diffcontext">.select(root.get(</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"id</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"));</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> List</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tList</span> <span class="diffcontext"><IdDTO> ids = s.createQuery(q).unwrap(Query.class)</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\t\t\t</span> <span class="diffcontext"> .setResultTransformer(new IdResultTransformer()).getResultList();</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> assertThat</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tassertThat</span> <span class="diffcontext">(ids.get(0).id, is(2));</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> });</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br>The</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\nThe</span> <span class="diffcontext"> IdResultTransformer creates the IdDTO, this works fine.</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br>However</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\nHowever</span> <span class="diffcontext">, when I want to expand the projected fields to more than one column using a multiselect</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br>doInOpenTransaction</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\ndoInOpenTransaction</span> <span class="diffcontext">((s, tx) -> {</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> CriteriaQuery</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tCriteriaQuery</span> <span class="diffcontext"><User> q = s.getCriteriaBuilder().createQuery(User.class);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> Root</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tRoot</span> <span class="diffcontext"><User> root = q.from(User.class);</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> q</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tq</span> <span class="diffcontext">.multiselect(root.get(</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"id</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"), root.get(</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"name</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"));</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> List</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tList</span> <span class="diffcontext"><UserDTO> ids = s.createQuery(q).unwrap(Query.class)</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\t\t\t</span> <span class="diffcontext"> .setResultTransformer(new UserResultTransformer()).getResultList();</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> assertThat</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tassertThat</span> <span class="diffcontext">(ids.get(0).id, is(2));</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br> assertThat</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t\tassertThat</span> <span class="diffcontext">(ids.get(0).name, is(</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"user</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">"));</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\t\t</span> <span class="diffcontext"> });</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br>where</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\nwhere</span> <span class="diffcontext"> UserTransformer has two fields,</span> <span class="diffaddedchars" style="background-color:#ddfade;"> \</span> <span class="diffcontext"> "id</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">" and</span> <span class="diffaddedchars" style="background-color:#ddfade;"> \</span> <span class="diffcontext"> "name</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">", I cannot do this by using the result transformer because</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\n</span> <span class="diffcontext">{noformat}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br>java</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\njava</span> <span class="diffcontext">.lang.RuntimeException: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [models.common.security.User]. Expected arguments are: int, java.lang.String [select new models.common.security.User(generatedAlias0.id, generatedAlias0.name) from models.common.security.User as generatedAlias0]</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{noformat}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br>the</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n\r\nthe</span> <span class="diffcontext"> query automatically uses</span> <span class="diffaddedchars" style="background-color:#ddfade;"> \</span> <span class="diffcontext"> "new</span> <span class="diffaddedchars" style="background-color:#ddfade;">\</span> <span class="diffcontext">" in the statement, so I cannot use a result transformer here. The only solution is the to use</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code:java}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br>s</span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\ns</span> <span class="diffcontext">.getCriteriaBuilder().createQuery(UserDTO.class)</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">\r\n</span> <span class="diffcontext">{code} which required me to have an appropriate constructor here.</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br><br>Test</span> <span class="diffaddedchars" style="background-color:#ddfade;"> using createQuery also forces me to decide quite early the resulting object class, which is IMHO not necessarily very convenient.\r\n\r\nTest</span> <span class="diffcontext"> case: https://github.com/nikowitt/hibernate-test-case-templates/tree/HHH-12706</span> <span class="diffaddedchars" style="background-color:#ddfade;">"</span> </td>
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