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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-9375" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-improvement-844a5cdd-ad98-4156-8500-af9e0ef71997" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9375" style="color: #3b73af; text-decoration: none">HHH-9375</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-9375" style="color: #3b73af; text-decoration: none">Hibernate OnDelete Cascade not working for MySql but Works on postgres and Ms-Sql</a> </span>
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core
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04/Sep/2014 09:38 AM
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hibernate jpa2 core
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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="rakz" id="email_rakz" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=rakz" style="color:#6c797f;; color: #3b73af; text-decoration: none">Rakesh Krishnan</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I'm having 2 Entities. *<b>Thread</b>* entity and *<b>Post</b>* entity using OnetoOne mapping from *<b>Post->Thread.</b>*</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Now the problem is, when i delete a *<b>Thread</b><b>, all the **post</b>* associated with it must also be removed.<br /> I'm successful in doing it by using</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"> @OnDelete(action = OnDeleteAction.CASCADE)</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">But it works only on Postgres and Ms-SQl but not on MySql(Tried InnoDb as well). The *<b>on delete cascade</b>* is not generated in the schema generation query.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Following are the code</p>
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<b>Thread.java</b>
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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">
<span class="code-comment" style="color: #808080">//<span class="code-object" style="color: #910091; color: #808080">Thread</span> Entity
</span> @Id
@GeneratedValue
@Column(name = <span class="code-quote" style="color: #009100">"thread_id"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> ThreadID;
</pre>
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<b>Post.java</b>
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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">
<span class="code-comment" style="color: #808080">//Post Entity
</span> @Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = <span class="code-quote" style="color: #009100">"post_id"</span>)
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> PostID;
@OneToOne()
@OnDelete(action = OnDeleteAction.CASCADE)
<span class="code-keyword" style="color: #000091">private</span> thread ThreadID;
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I get the following error While deleting an item from *<b>Thread</b>* entity using the following query</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">
session.delete(session.load(thread.class,1));
</pre>
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<b>Stack Trace</b>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">ERROR: Cannot delete or update a parent row: a foreign key constraint fails (`forum`.`post_tbl`, CONSTRAINT `FK_bfbv5nknqj7ppd5630scimhtb` <br /> FOREIGN KEY (`ThreadID_thread_id`) REFERENCES `thread_tbl` (`thread_id`))<br /> org.hibernate.exception.ConstraintViolationException: could not execute statement</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`forum`.`post_tbl`, CONSTRAINT `FK_bfbv5nknqj7ppd5630scimhtb` FOREIGN KEY (`ThreadID_thread_id`) REFERENCES `thread_tbl` (`thread_id`))</p>
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