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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-11636" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6c38278c-073a-45ae-b611-f4d388ae7a4b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11636" style="color: #3b73af; text-decoration: none">HHH-11636</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-11636" style="color: #3b73af; text-decoration: none">JPQL implicit join (one-to-one relationship) generates "CROSS JOIN" </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-6c38278c-073a-45ae-b611-f4d388ae7a4b" 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"> 5.0.12 </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"> 14/Apr/2017 06:40 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="Ilya Bystrov" id="email_Ilya Bystrov" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Ilya+Bystrov" style="color:#6c797f;; color: #3b73af; text-decoration: none">Ilya Bystrov</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">Hibernate Core </p> {5.0.12.Final} <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">JPQL implicit join causes Hibernate generate "CROSS JOIN" instead of "INNER JOIN" for joining tables with one-to-one relationship.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Looks like another old similar issue <a href="https://hibernate.atlassian.net/browse/HHH-7707" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://hibernate.atlassian.net/browse/HHH-7707</a>.</p> <h5 style="margin: 10px 0 0; color: #707070; font-size: 12px; line-height: 1.667; margin: 20px 0 0; text-transform: uppercase"><a name="Entities" style="color: #3b73af; text-decoration: none"></a>Entities</h5>
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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">import</span> lombok.Data;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Entity;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Id;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.JoinColumn;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.OneToOne;
@Entity
@Data
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Person {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> firstname;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> lastname;
@OneToOne
@JoinColumn(name = <span class="code-quote" style="color: #009100">"id"</span>)
<span class="code-keyword" style="color: #000091">private</span> StreetAddress streetAddress;
}
</pre>
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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">import</span> lombok.Data;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Entity;
<span class="code-keyword" style="color: #000091">import</span> javax.persistence.Id;
@Entity
@Data
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>StreetAddress {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> personId;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> address;
}
h5. Implicit Join (generates Cross Join)ΒΆ
{code:sql}
select p from Person p where p.streetAddress.address = ?1
</pre>
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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">
Hibernate:
/* select
p
from
Person p
where
p.streetAddress.address = ?1 */ select
person0_.id as id1_0_,
person0_.firstname as firstnam2_0_,
person0_.lastname as lastname3_0_
from
person person0_ cross
join
street_address streetaddr1_
where
person0_.id=streetaddr1_.person_id
and streetaddr1_.address=?
</pre>
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</div> <h5 style="margin: 10px 0 0; color: #707070; font-size: 12px; line-height: 1.667; margin: 20px 0 0; text-transform: uppercase"><a name="ExplicitJoin%28generatesInnerJoin%29" style="color: #3b73af; text-decoration: none"></a>Explicit Join (generates Inner Join)</h5>
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<pre class="code-sql" 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">select</span> p <span class="code-keyword" style="color: #000091">from</span> Person p <span class="code-keyword" style="color: #000091">join</span> p.streetAddress <span class="code-keyword" style="color: #000091">a</span> <span class="code-keyword" style="color: #000091">where</span> <span class="code-keyword" style="color: #000091">a</span>.address = ?1
</pre>
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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">
Hibernate:
/* select
p
from
Person p
join
p.streetAddress a
where
a.address = ?1 */ select
person0_.id as id1_0_,
person0_.firstname as firstnam2_0_,
person0_.lastname as lastname3_0_
from
person person0_
<span class="code-keyword" style="color: #000091">inner</span> join
street_address streetaddr1_
on person0_.id=streetaddr1_.person_id
where
streetaddr1_.address=?
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Full source code available on <a href="https://github.com/ilya-bystrov/ilya-bystrov.github.io-src/tree/master/hibernate_jpql_cross_join_bug" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">github</a>. The same description can be found on my <a href="https://ilya-bystrov.github.io/posts/hibernate-jpql-cross-join-bug/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">blog</a></p> </td>
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