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<p style="margin: 10px 0 0 0">Sorry for not supplying a pull request, but I was not able to figure out how to get a working hibernate workspace up and running using Eclipse under Windows. </p>
<p style="margin: 10px 0 0 0">Interestingly the work around with down casting the value type as mentioned in <a href="https://hibernate.atlassian.net/browse/HHH-4700" title="ClassCastException with parameter as CASE results" class="issue-link" data-issue-key="HHH-4700" style="color: #3b73af; text-decoration: none"></a></p>
<del>
HHH-4700
</del> and <a href="https://hibernate.atlassian.net/browse/HHH-9343" title="Case/when in criteria with string literal result fails type checking" class="issue-link" data-issue-key="HHH-9343" style="color: #3b73af; text-decoration: none">HHH-9343</a> is not working anymore on the current 4.3.x branch. At least on 4.1.4 it was working.
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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">package</span> test;
<span class="code-keyword" style="color: #000091">public</span> class SelectCaseTest {
@javax.persistence.Entity
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> class Entity {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
@Enumerated(EnumType.STRING)
<span class="code-keyword" style="color: #000091">private</span> EnumValue value;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">enum</span> EnumValue {
VALUE_1,
VALUE_2;
}
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> EntityManagerFactory factory;
<span class="code-keyword" style="color: #000091">private</span> EntityManager entityManager;
@BeforeClass
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void beforeClass() {
factory = Persistence.createEntityManagerFactory(<span class="code-quote" style="color: #009100">"test"</span>);
}
@AfterClass
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void afterClass() {
factory.close();
}
@Before
<span class="code-keyword" style="color: #000091">public</span> void before() {
entityManager = factory.createEntityManager();
}
@After
<span class="code-keyword" style="color: #000091">public</span> void after() {
entityManager.close();
}
@Test
<span class="code-keyword" style="color: #000091">public</span> void selectCaseWithValuesShouldWork() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
Case<EnumValue> selectCase = cb.selectCase();
Predicate somePredicate = cb.equal(cb.literal(1), 1);
selectCase.when(somePredicate, EnumValue.VALUE_1);
selectCase.otherwise(EnumValue.VALUE_2);
CriteriaQuery<Entity> query = cb.createQuery(Entity.class);
Root<Entity> from = query.from(Entity.class);
query.select(from).where(cb.equal(from.get(<span class="code-quote" style="color: #009100">"value"</span>), selectCase));
List<?> result = entityManager.createQuery(query).getResultList();
<span class="code-object" style="color: #910091">System</span>.out.println(result);
}
@Test
<span class="code-keyword" style="color: #000091">public</span> void selectCaseWithCastedTypeValuesShouldWork() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
Case<<span class="code-object" style="color: #910091">String</span>> selectCase = cb.selectCase();
Predicate somePredicate = cb.equal(cb.literal(1), 1);
selectCase.when(somePredicate, EnumValue.VALUE_1.name());
selectCase.otherwise(EnumValue.VALUE_2.name());
CriteriaQuery<Entity> query = cb.createQuery(Entity.class);
Root<Entity> from = query.from(Entity.class);
query.select(from).where(cb.equal(from.get(<span class="code-quote" style="color: #009100">"value"</span>), selectCase.as(<span class="code-object" style="color: #910091">String</span>.class)));
List<?> result = entityManager.createQuery(query).getResultList();
<span class="code-object" style="color: #910091">System</span>.out.println(result);
}
@Test
<span class="code-keyword" style="color: #000091">public</span> void simpleSelectCaseWithValuesShouldWork() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
SimpleCase<<span class="code-object" style="color: #910091">Integer</span>, EnumValue> selectCase = cb.selectCase(cb.literal(1));
selectCase.when(1, EnumValue.VALUE_1);
selectCase.otherwise(EnumValue.VALUE_2);
CriteriaQuery<Entity> query = cb.createQuery(Entity.class);
Root<Entity> from = query.from(Entity.class);
query.select(from).where(cb.equal(from.get(<span class="code-quote" style="color: #009100">"value"</span>), selectCase));
List<?> result = entityManager.createQuery(query).getResultList();
<span class="code-object" style="color: #910091">System</span>.out.println(result);
}
@Test
<span class="code-keyword" style="color: #000091">public</span> void simpleSelectCaseWithCastedTypeValuesShouldWork() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
SimpleCase<<span class="code-object" style="color: #910091">Integer</span>, <span class="code-object" style="color: #910091">String</span>> selectCase = cb.selectCase(cb.literal(1));
selectCase.when(1, EnumValue.VALUE_1.name());
selectCase.otherwise(EnumValue.VALUE_2.name());
CriteriaQuery<Entity> query = cb.createQuery(Entity.class);
Root<Entity> from = query.from(Entity.class);
query.select(from).where(cb.equal(from.get(<span class="code-quote" style="color: #009100">"value"</span>), selectCase.as(<span class="code-object" style="color: #910091">String</span>.class)));
List<?> result = entityManager.createQuery(query).getResultList();
<span class="code-object" style="color: #910091">System</span>.out.println(result);
}
}
</pre>
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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">
<?xml version=<span class="code-quote" style="color: #009100">"1.0"</span> encoding=<span class="code-quote" style="color: #009100">"UTF-8"</span>?>
<persistence version=<span class="code-quote" style="color: #009100">"2.0"</span>
xmlns=<span class="code-quote" style="color: #009100">"http:<span class="code-comment" style="color: #808080">//java.sun.com/xml/ns/persistence"</span> xmlns:xsi=<span class="code-quote" style="color: #009100">"http://www.w3.org/2001/XMLSchema-instance"</span>
</span> xsi:schemaLocation=<span class="code-quote" style="color: #009100">"http:<span class="code-comment" style="color: #808080">//java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"</span>>
</span> <persistence-unit name=<span class="code-quote" style="color: #009100">"test"</span>
transaction-type=<span class="code-quote" style="color: #009100">"RESOURCE_LOCAL"</span>>
<class>test.SelectCaseTest$Entity</class>
<properties>
<property name=<span class="code-quote" style="color: #009100">"javax.persistence.jdbc.driver"</span> value=<span class="code-quote" style="color: #009100">"org.hsqldb.jdbcDriver"</span> />
<property name=<span class="code-quote" style="color: #009100">"javax.persistence.jdbc.url"</span> value=<span class="code-quote" style="color: #009100">"jdbc:hsqldb:file:target/testdb;shutdown=<span class="code-keyword" style="color: #000091; color: #009100">true</span>"</span> />
<property name=<span class="code-quote" style="color: #009100">"javax.persistence.jdbc.user"</span> value=<span class="code-quote" style="color: #009100">"sa"</span> />
<property name=<span class="code-quote" style="color: #009100">"javax.persistence.jdbc.password"</span> value="" />
<property name=<span class="code-quote" style="color: #009100">"hibernate.hbm2ddl.auto"</span> value=<span class="code-quote" style="color: #009100">"update"</span> />
<property name=<span class="code-quote" style="color: #009100">"hibernate.archive.autodetection"</span> value=<span class="code-quote" style="color: #009100">"class"</span> />
<property name=<span class="code-quote" style="color: #009100">"hibernate.flushMode"</span> value=<span class="code-quote" style="color: #009100">"FLUSH_AUTO"</span> />
<property name=<span class="code-quote" style="color: #009100">"hibernate.hbm2ddl.auto"</span> value=<span class="code-quote" style="color: #009100">"create"</span> />
<property name=<span class="code-quote" style="color: #009100">"hibernate.show_sql"</span> value=<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">true</span>"</span>/>
</properties>
</persistence-unit>
</persistence>
</pre>
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