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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-11778" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-f079a246-423a-4f01-9786-10135317587b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11778" style="color: #3b73af; text-decoration: none">HHH-11778</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-11778" style="color: #3b73af; text-decoration: none">Inconsistent handling of CriteriaBuilder.literal() depending on context</a> </span> </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-avatar-f079a246-423a-4f01-9786-10135317587b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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"> hibernate-core </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"> 29/May/2017 08:20 AM </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="lukas.eder" id="email_lukas.eder" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=lukas.eder" style="color:#6c797f;; color: #3b73af; text-decoration: none">Lukas Eder</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">I have the following code snippet:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">{{CriteriaBuilder cb = em.getCriteriaBuilder();<br> CriteriaQuery<String> q = cb.createQuery(String.class);<br> Root<JPABook> from = q.from(JPABook.class);<br> q.select(cb.<String>selectCase()<br> .when(cb.equal(from.get("title"), cb.literal("Animal Farm")), cb.literal("Animal Farm"))<br> .otherwise(cb.nullLiteral(String.class)));<br> em.createQuery(q).getResultList();}}</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It generates this SQL string:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">{{<br> select case when jpabook0_.title=? then 'Animal Farm' else cast(null as varchar(255)) end as col_0_0_ from t_book jpabook0_<br> }}</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">As you can see, the literal in the CASE expression's predicate is sent to the server as a bind variable, whereas the literal in the THEN clause is sent as a literal.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I personally believe that the latter is correct because the intention of using <tt>CriteriaBuilder.literal()</tt> is for an actual literal to make it into the generated SQL string. Because if users wanted a parameter, they could have used <tt>CriteriaBuilder.parameter()</tt> instead. What's the point of <tt>literal()</tt> if it still generates a parameter.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I've already had this discussion with Vlad Mihalcea on Twitter:<br> <a href="https://twitter.com/lukaseder/status/869209243282530304" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://twitter.com/lukaseder/status/869209243282530304</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Even if you might not agree with the above, I think the behaviour of all <tt>CriteriaBuilder.literal()</tt> calls should be consistent, so:</p>
<ul class="alternate" type="square">
<li>Either generate only actual literals in generated SQL (properly escaping them of course!)</li>
<li>Or generate only bind variables in generated SQL</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Side-note: try using a Java string containing an apostrophe instead in both places: <tt>"This isn't working"</tt> and see what happens...</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Related issue: <a href="https://hibernate.atlassian.net/browse/HHH-9576" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://hibernate.atlassian.net/browse/HHH-9576</a></p> </td>
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