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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-11415" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-ed061c7f-652c-4751-86b1-4dddae686a09" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11415" style="color: #3b73af; text-decoration: none">HHH-11415</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-11415" style="color: #3b73af; text-decoration: none">AttributeConverter: Only convert if the value is of the Java type (and not already of the database type). </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-ed061c7f-652c-4751-86b1-4dddae686a09" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </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"> 5.2.7 </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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 23/Jan/2017 19:25 PM </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"> jpa21 </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-static-major-a5a2405a-6b93-4168-9716-9f30d177a5e6" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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="marcg" id="email_marcg" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=marcg" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marcelo Glasberg</a> </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">1h</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">1h</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">Suppose a `CreditcardNumb.class` with a constructor that checks if the credit-card number is valid. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I then create a `CreditcardNumbConverter.class` to convert credit-card numbers to Strings in the database:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> class CreditcardnumbConverter
<span class="code-keyword" style="color: #000091">implements</span> AttributeConverter<CreditcardNumb, <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(CreditcardNumb cn) {
<span class="code-keyword" style="color: #000091">if</span> (cn== <span class="code-keyword" style="color: #000091">null</span>) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">null</span>;
<span class="code-keyword" style="color: #000091">return</span> cn.toString();
}
<span class="code-keyword" style="color: #000091">public</span> CreditcardNumb convertToEntityAttribute(<span class="code-object" style="color: #910091">String</span> cn) {
<span class="code-keyword" style="color: #000091">if</span> ((cn == <span class="code-keyword" style="color: #000091">null</span>) || cn.trim().isEmpty()) <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">null</span>;
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">new</span> CreditcardNumb(cn);
}
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This works ok, but now I want to use the Criteria API (the new or the old API, doesn't matter) to search for all credit-card numbers that start with "123":</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
CreditcardNumb cn = <span class="code-keyword" style="color: #000091">new</span> CreditcardNumb(<span class="code-quote" style="color: #009100">"123"</span>);
createCriteria(Wallet.class)
.add(Restrictions.ilike(<span class="code-quote" style="color: #009100">"creditcard"</span>, cn, MatchMode.START))
.list();
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, since "123" is not a valid credit-card number, the object instantiation fails. Also, the ilike method doesn't accept CreditcardNumb objects, but only Strings.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There are two ways of solving this (I prefer the second):</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">1) Let us locally bypass or disable the conversion, so that I can do something like:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
createCriteria(Wallet.class)
.disable(CreditcardnumbConverter.class))
.add(Restrictions.ilike(<span class="code-quote" style="color: #009100">"creditcard"</span>, <span class="code-quote" style="color: #009100">"123"</span>, MatchMode.START))
.list();
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">2) But, better yet, simply check if the value is already of the database type, and if so, bypass the conversion (or else, check if the value is of the Java type, and only if so, do the conversion). </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The exact place the Criteria fails (on Hibernate 5.2.7) is at <b>org.hibernate.type.descriptor.converter.AttributeConverterSqlTypeDescriptorAdapter, line 77</b>, where we get this exception:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
java.lang.ClassCastException: java.lang.<span class="code-object" style="color: #910091">String</span> cannot be <span class="code-keyword" style="color: #000091">cast</span> to CpfOuCnpj.CpfOuCnpj
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The failing line is:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
convertedValue = converter.convertToDatabaseColumn( value );
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This could be changed to something along the lines of:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-object" style="color: #910091">Class</span> javaClass = intermediateJavaTypeDescriptor.getJavaTypeClass();
<span class="code-object" style="color: #910091">Class</span> valueClass = value.getClass();
<span class="code-keyword" style="color: #000091">if</span> (javaClass.isAssignableTo(valueClass()) {
convertedValue = converter.convertToDatabaseColumn(value);
}
<span class="code-keyword" style="color: #000091">else</span> {
convertedValue = value;
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Note that this tiny modification doesn't break the AttributeConverter specification in any way, and would allow for very powerful queries that are simply not possible in the current implementation.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I have a few other use cases that this modification would solve, and can provide them if it helps prove that this modification is very useful.</p> </td>
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