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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-9318" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-7cc9b246-adc9-4ca8-bc16-e14be93c30df" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9318" style="color: #3b73af; text-decoration: none">HHH-9318</a>
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<td style="vertical-align: top;; padding: 0px; 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-9318" style="color: #3b73af; text-decoration: none">JPA 2.1 constructor-result - ignores type attribute</a> </span>
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Issue Type:
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Affects Versions:
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4.3.5
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Unassigned
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Components:
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core
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Created:
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06/Aug/2014 14:47 PM
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JPA
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Reporter:
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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="jmnarloch" id="email_jmnarloch" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=jmnarloch" style="color:#6c797f;; color: #3b73af; text-decoration: none">Jakub Narloch</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">According to JPA 2.1 specs: <a href="http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-eval-spec/index.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-eval-spec/index.html</a><br /> the orm.xml definiton of constructor-result should allow to specify the column type - through <b>class</b> attribute e.g.:</p>
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<sql-result-set-mapping name=<span class="code-quote" style="color: #009100">"XMLEmployeeConstructorResultSetMapping"</span>>
<constructor-result target-class=<span class="code-quote" style="color: #009100">"EmployeeDetails"</span>>
<column-result name=<span class="code-quote" style="color: #009100">"EMP_ID"</span> class=<span class="code-quote" style="color: #009100">"<span class="code-object" style="color: #910091; color: #009100">Integer</span>"</span>/>
<column-result name=<span class="code-quote" style="color: #009100">"F_NAME"</span> class=<span class="code-quote" style="color: #009100">"<span class="code-object" style="color: #910091; color: #009100">String</span>"</span>/>
<column-result name=<span class="code-quote" style="color: #009100">"L_NAME"</span> class=<span class="code-quote" style="color: #009100">"<span class="code-object" style="color: #910091; color: #009100">String</span>"</span>/>
<column-result name=<span class="code-quote" style="color: #009100">"R_COUNT"</span> class=<span class="code-quote" style="color: #009100">"<span class="code-object" style="color: #910091; color: #009100">Integer</span>"</span>/>
</constructor-result>
</sql-result-set-mapping>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">but the implementation apparently ignoes those values and always tries to map them based on the retrieved result set metadata </p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This leads to funny situation in which despite that one had provided explicit type mapping, recieves an exception thrown from ConstructorResultColumnProcessor that no matching constructor has been found, so without actually running the query for the first time I can not define the constructor that Hibernate will be able to invoke.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I'm not entirely familar with the Hibernate internalls, but that might seem not entirely portable accross diferent DBMS and JDBC drivers as for instance in one driver the result of COUNT() function can be mapped in int and in another into long. Preferebly the types that were defined in the mapping should take precedence and based on the the proper constructor should be resolved.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">As long as I am concerned, the problem lays in implementation of ResultsetMappingSecondPass that never sets the mapped type, and always passes null:</p>
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<span class="code-keyword" style="color: #000091">for</span> ( ConstructorResult constructorResult : ann.classes() ) {
List<NativeSQLQueryScalarReturn> columnReturns = <span class="code-keyword" style="color: #000091">new</span> ArrayList<NativeSQLQueryScalarReturn>();
<span class="code-keyword" style="color: #000091">for</span> ( ColumnResult columnResult : constructorResult.columns() ) {
columnReturns.add(
<span class="code-keyword" style="color: #000091">new</span> NativeSQLQueryScalarReturn(
mappings.getObjectNameNormalizer().normalizeIdentifierQuoting( columnResult.name() ),
<span class="code-keyword" style="color: #000091">null</span>
)
);
}
definition.addQueryReturn(
<span class="code-keyword" style="color: #000091">new</span> NativeSQLQueryConstructorReturn( constructorResult.targetClass(), columnReturns )
);
}
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