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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-9950" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-587172bf-af8e-4c28-a77f-f41054538202" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9950" style="color: #3b73af; text-decoration: none">HHH-9950</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-9950" style="color: #3b73af; text-decoration: none">Update of not-null foreign key column to null if relation is owned on "parent" side</a> </span>
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Change By:
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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="abeani" id="email_abeani" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=abeani" style="color:#6c797f;; color: #3b73af; text-decoration: none">Andreas Benneke</a>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">Exploring the possibilities on optimistic locking while tracking changes on a {{OneToMany}}-relation we tried to setup the relation in a way where the parent is "owner". This does not seem to be very common nor well documented, so we may be led astray here - it however seems to be supported to some extend:<br /><br />The easy case is that the relation is unidirectional from parent to child<br /><br />{code}<br />@OneToMany(cascade=CascadeType.ALL, orphanRemoval= true)<br />@JoinColumn(name = "parent_id")<br />public Set<UnidirectionalChild> getChildren() <br />{code}<br /><br />with no corresponding relation on the child side the parent is clearly the owner. The parent version is perfectly updated in this case when children are added or removed.<br /><br />A more complex case is when we add the relation on the child side making it bidirectional - the "optional" case first:<br /><br />{code}<br />// optional = true is default, just repeated here to clarify<br />@ManyToOne(optional = true)<br />public BidirectionalOptionalParent getParent()<br />{code}<br /><br />Please note, that there is (still) no {{mappedBy}} at the {{OneToMany}} annotation. If there would be, the child would be the owner of the relation and we would lose the optimistic locking on collection changes.<br /><br />This bidirectional-optional scenario works as expected as well. However while removing a child Hibernate issues an extra update on that child to set the parent to {{null}} right before deleting it:<br /><br />{code}<br />update BidirectionalOptionalChild set parent_id=null where parent_id=? and id=?<br />delete from BidirectionalOptionalChild where id=? and version=?<br />{code}<br /><br />If you now make the child-to-parent-relation mandatory<br /><br />{code}<br />@ManyToOne(optional = false)<br />public BidirectionalMandatoryParent getParent()<br />{code}<br /><br />removing a child is no longer possible due to the extra update mentioned above which leads to a "NULL not allowed" exception.<br /><br />To complete the cycle we finally found a way to handle the mandatory case as well using (abusing?) the {{@OptimisticLock}} annotation:<br /><br />{code}<br />@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "parent")<br />@OptimisticLock(excluded = false)<br />public Set<BidirectionalOptimisticLockChild> getChildren()<br />{code}<br /><br />on the parent side and<br /><br />{code}<br />@ManyToOne(optional = false)<br />@JoinColumn(name = "parent_id")<br />public BidirectionalOptimisticLockParent getParent()<br />{code}<br /><br />at the child side. This bidirectional-mandatory-optimistic-lock scenario works as expected now.<br /><br />You may find all cases in a test project on Github https://github.com/abenneke/sandbox/tree/master/hibernate-versions as {{*ParentOwnedTest}}</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">s</span> <span class="diffcontext">.<br /><br />Thank you!</span>
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