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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-11877" style="color: #3b73af; text-decoration: none">Re: Criteria query generates invalid query resulting in QuerySyntaxException</a> </span> </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: 10px 0 0; margin-top: 0">OK, I think I figured out what is happening. It does appear to be a bug.</p> <p style="margin: 10px 0 0">I have a superclass...</p>
<div class="preformatted 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">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">public abstract class SimpleComparisonPredicateBuilder<T, V> {
private final V targetValue;
/**
* Constructor.
*
* @param targetValue value to check against, possibly null
*/
protected SimpleComparisonPredicate(V targetValue) {
this.targetValue = targetValue;
}
/**
* Create a predicate that compares the target expression with this instance's target value.
*/
@Override
public Predicate getPredicate(CriteriaQuery<?> query, CriteriaBuilder builder, From<?, ? extends T> from) {
final Expression<V> expression = this.getExpression(query, builder, from);
return this.targetValue != null ? builder.equal(expression, this.targetValue) : builder.isNull(expression);
}
/**
* Get criteria expression representing the value to test.
*/
protected abstract Expression<V> getExpression(CriteriaQuery<?> query, CriteriaBuilder builder,
From<?, ? extends T> from);
}
</pre>
</div>
</div> <p style="margin: 10px 0 0">and a subclass:</p>
<div class="preformatted 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">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">public class IsFoobarPrimary extends SimpleComparisonPredicateBuilder<Foobar, Boolean> {
public IsFoobarPrimary() {
super(true);
}
@Override
protected Predicate getExpression(CriteriaQuery<?> query, CriteriaBuilder builder,
From<?, ? extends Foobar> foobar) {
return builder.isTrue(foobar.get(Foobar_.primary));
}
}
</pre>
</div>
</div> <p style="margin: 10px 0 0">When I change the subclass to this, it works:</p>
<div class="preformatted 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">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">public class IsFoobarPrimary extends SimpleComparisonPredicate<Foobar, Boolean> {
public IsFoobarPrimary() {
super(true);
}
@Override
protected Expression<Boolean> getExpression(CriteriaQuery<?> query, CriteriaBuilder builder,
From<?, ? extends Foobar> foobar) {
return foobar.get(Foobar_.primary);
}
}
</pre>
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</div> <p style="margin: 10px 0 0">So it seems the but is that the criteria API is simply failing to add some required parentheses around the generated JPQL comparison when constructing a comparison between two values.</p> </td>
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