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<a class="user-hover" rel="damonweinstein" id="email_damonweinstein" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=damonweinstein" style="color:#6c797f;">Damon Weinstein</a>
created <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-8035'>HHH-8035</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-8035'><strong>Postgres dialect generates non-recursive query for recursive Composite Object pattern</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
4.1.10 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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query-criteria </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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25/Feb/13 3:15 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>The following link: <a href="http://www.tikalk.com/java/load-a-tree-with-jpa-and-hibernate">http://www.tikalk.com/java/load-a-tree-with-jpa-and-hibernate</a><br/>
describes how to load a Recursively structured Composite Object pattern from a single table.<br/>
Hibernate generates this object quite well, and does a fine job with both Lazy as well as Eager loading of the children -<br/>
If however you try to have an Entity with the following bi-directional relationship:</p>
<p style='margin-top:0;margin-bottom:10px;'>Public Class CompositeElement {<br/>
...<br/>
@ManyToOne<br/>
@JoinColumn(name = "parent_id")<br/>
public CompositeElement getParent() {
return parent;
}</p>
<p style='margin-top:0;margin-bottom:10px;'> @OneToMany(mappedBy = "parent", targetEntity = CompositeElement.class, fetch = FetchType.LAZY, cascade = CascadeType.ALL)<br/>
public List<CompositeElement> getChildren() {
return children;
}</p>
<p style='margin-top:0;margin-bottom:10px;'>but try to override the fetch behavior in a particular use case for example using a Criteria:</p>
<p style='margin-top:0;margin-bottom:10px;'>criteria.setFetchMode("children", FetchMode.JOIN);</p>
<p style='margin-top:0;margin-bottom:10px;'>The query which is generated is not correct for postgres:<br/>
from CompositeElement compositee0_<br/>
left outer join CompositeElement compositee2_ on compositee1_.parent_id=compositee2_.id</p>
<p style='margin-top:0;margin-bottom:10px;'>Which will only go one level deep into the recursive structure.</p>
<p style='margin-top:0;margin-bottom:10px;'>This should generate a with recursion query for postgres.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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I am running in the context of Tomcat 7.0 + Spring 3.2 + using JPA annotations
<br/>
java version "1.7.0_13"
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Labels:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
criteria
composite
recursive
postgres
child
parent
node
tree
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="damonweinstein" id="email_damonweinstein" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=damonweinstein" style="color:#6c797f;">Damon Weinstein</a>
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