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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-10390" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-4ffc0cad-cfb9-4d7d-a2eb-aa66c753ee4c" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10390" style="color: #3b73af; text-decoration: none">HHH-10390</a> </td>
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<td class="has-icon" style="padding: 0px; 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-4ffc0cad-cfb9-4d7d-a2eb-aa66c753ee4c" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </td>
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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"> 5.0.6 </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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 20/Dec/2015 03:27 AM </td>
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<td class="has-icon" style="padding: 0px; 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-a0ec97b4-2180-41fd-8461-2410598e3bfc" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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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="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: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">When working with SQL and tree data structures, hierarchical SQL queries are typically used to materialise an entire tree or subtree.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Assuming the following table and example data (in Oracle):</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
CREATE TABLE t_directory (
id number(7) NOT NULL,
parent_id number(7),
is_directory number(7),
<span class="code-quote" style="color: #009100">"name"</span> varchar2(50),
CONSTRAINT pk_t_directory PRIMARY KEY (ID),
CONSTRAINT pk_t_directory_self FOREIGN KEY (PARENT_ID)
REFERENCES t_directory(ID) ON DELETE CASCADE
);
INSERT INTO t_directory VALUES ( 1, <span class="code-keyword" style="color: #000091">null</span>, 1, 'C:');
INSERT INTO t_directory VALUES ( 2, 1, 1, 'eclipse');
INSERT INTO t_directory VALUES ( 3, 2, 1, 'configuration');
INSERT INTO t_directory VALUES ( 4, 2, 1, 'dropins');
INSERT INTO t_directory VALUES ( 5, 2, 1, 'features');
INSERT INTO t_directory VALUES ( 7, 2, 1, 'plugins');
INSERT INTO t_directory VALUES ( 8, 2, 1, 'readme');
INSERT INTO t_directory VALUES ( 9, 8, 0, 'readme_eclipse.html');
INSERT INTO t_directory VALUES (10, 2, 1, 'src');
INSERT INTO t_directory VALUES (11, 2, 0, 'eclipse.exe');
INSERT INTO t_directory VALUES (12, 2, 0, 'eclipse.ini');
INSERT INTO t_directory VALUES (13, 1, 1, 'Program Files');
INSERT INTO t_directory VALUES (14, 13, 1, 'Internet Explorer');
INSERT INTO t_directory VALUES (15, 14, 1, 'de-DE');
INSERT INTO t_directory VALUES (16, 14, 0, 'ielowutil.exe');
INSERT INTO t_directory VALUES (17, 14, 0, 'iexplore.exe');
INSERT INTO t_directory VALUES (18, 13, 1, 'Java');
INSERT INTO t_directory VALUES (19, 18, 1, 'jre6');
INSERT INTO t_directory VALUES (20, 19, 1, 'bin');
INSERT INTO t_directory VALUES (21, 20, 0, 'java.exe');
INSERT INTO t_directory VALUES (22, 20, 0, 'javaw.exe');
INSERT INTO t_directory VALUES (23, 20, 0, 'javaws.exe');
INSERT INTO t_directory VALUES (24, 19, 1, 'lib');
INSERT INTO t_directory VALUES (25, 24, 0, 'javaws.jar');
INSERT INTO t_directory VALUES (26, 24, 0, 'rt.jar');
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In Oracle SQL, I would now query the table via:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
SELECT *
FROM t_directory
CONNECT BY PRIOR id = parent_id
START WITH parent_id IS NULL
ORDER SIBLINGS BY <span class="code-quote" style="color: #009100">"name"</span>
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">or with jOOQ</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
DSL.using(configuration)
.select()
.from(T_DIRECTORY)
.connectBy(prior(T_DIRECTORY.ID).eq(T_DIRECTORY.PARENT_ID))
.startWith(T_DIRECTORY.PARENT_ID.isNull())
.orderSiblingsBy(T_DIRECTORY.NAME)
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">If I wanted to use the above native query with Hibernate via JPA, I would create the following entity:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"t_directory"</span>)
<span class="code-keyword" style="color: #000091">public</span> class JPADirectory {
@Id
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">int</span> id;
@ManyToOne
@JoinColumn(name = <span class="code-quote" style="color: #009100">"parent_id"</span>)
<span class="code-keyword" style="color: #000091">public</span> JPADirectory parent;
@OneToMany(mappedBy = <span class="code-quote" style="color: #009100">"parent"</span>)
<span class="code-keyword" style="color: #000091">public</span> List<JPADirectory> children;
@Column(name = <span class="code-quote" style="color: #009100">"`name`"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> name;
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">... and then run</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
List<JPADirectory> result = em.createNativeQuery(sql, JPADirectory.class).getResultList();
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">With Hibernate, the above will nicely associate parents with their children, but not children with their parents, because Hibernate cannot guarantee that all children are present (see also <a href="http://stackoverflow.com/a/34374600/521799" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://stackoverflow.com/a/34374600/521799</a>).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">However, because I wrote the "right thing" in SQL, I <b>know</b> that all the children per parent are present, and I don't want Hibernate to run any additional queries when I access some JPADirectory.children collection.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>TL;DR:</b> I would like to be able to specify that for this particular native query, all children collections should be materialised and considered complete.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Nice-to-have:</b> Currently, the order specified in ORDER SIBLINGS BY is lost - it would be great if that were maintained.</p> </td>
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