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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-9447" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-d15820ee-89fe-4cd3-a6ef-1246e4b3e8eb" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9447" style="color: #3b73af; text-decoration: none">HHH-9447</a>
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<td style="vertical-align: top;; padding: 0px; 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-9447" style="color: #3b73af; text-decoration: none">@OneToOne + FetchType.LAZY fetches aggressively</a> </span>
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Issue Type:
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Affects Versions:
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4.2.14, 3.3.2
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Assignee:
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Unassigned
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Attachments:
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testcase2.tar.gz
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Components:
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query-sql
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Created:
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17/Oct/2014 15:38 PM
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Labels:
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sql lazy one-to-one
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Priority:
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Reporter:
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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="stephen.fikes" id="email_stephen.fikes" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=stephen.fikes" style="color:#6c797f;; color: #3b73af; text-decoration: none">Stephen Fikes</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When an association is defined as below, lazy fetch is not enforced when querying the primary key side types - an HQL query such as <tt>"from Person"</tt> results in <b>two</b> separate SQL queries - one for the Person class and one for the Pet entity.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">There should be a <b>single</b> query - for the Person HQL - and the Pet query should be executed only when the association getter is accessed. </p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> class Person {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> id;
@OneToOne(cascade={CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REMOVE}, fetch=FetchType.LAZY, mappedBy=<span class="code-quote" style="color: #009100">"owner"</span>)
@LazyToOne(value = LazyToOneOption.NO_PROXY)
<span class="code-keyword" style="color: #000091">private</span> Pet pet;
<span class="code-comment" style="color: #808080">// setters/getters here
</span>}
@Entity
<span class="code-keyword" style="color: #000091">public</span> class Pet {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> id;
@OneToOne(fetch=FetchType.LAZY, cascade={CascadeType.MERGE, CascadeType.PERSIST})
@LazyToOne(value = LazyToOneOption.NO_PROXY)
@JoinColumn(name=<span class="code-quote" style="color: #009100">"owner_id"</span>)
<span class="code-keyword" style="color: #000091">private</span> Person owner;
<span class="code-comment" style="color: #808080">// setters/getters here
</span>}
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