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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-10267" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-874e5fc0-9296-4179-b046-6aa5172f326f" 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-10267" style="color: #3b73af; text-decoration: none">HHH-10267</a>
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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="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</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">When using bytecode enhanced lazy loading, the current scheme is to fetch all lazy attributes when one is accessed. There are many times it would be great to define groupings of attributes to be fetched when one of the group is accessed. <br /><br />In a sense, the current scheme is a single "fetch group". This is about adding the ability for the user to explicitly control the definition of other groups.<br /><br />A single attribute could only belong to one fetch group.</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br /><br />The annotation to control this is {{org.hibernate.annotations.LazyGroup}}, e.g.:<br /><br />{code}<br />@Entity<br />public class Customer {<br /> @Id<br /> private Integer id;<br /> private String name;<br /> @Basic( fetch = FetchType.LAZY )<br /> private UUID accountsPayableXrefId;<br /> @Lob<br /> @Basic( fetch = FetchType.LAZY )<br /> @LazyGroup( "lobs" )<br /> private Blob image;<br /><br /> ...<br />}<br />{code}<br /><br />Both {{accountsPayableXrefId}} and {{image}} are lazy, but each is part of a different fetch group ({{accountsPayableXrefId}} is part of the default fetch group). Which means that accessing {{accountsPayableXrefId}} will not force the loading of {{image}}.<br /><br />By default all lazy singular attributes are part of a group named "DEFAULT" and all plural attributes are their own group. <br /><br />For many-to-one and one-to-one attributes, it is expected that they also be marked with {{@LazyToOne(LazyToOneOption.NO_PROXY)}}, for now. The reason is legacy. We are discussing relaxing that requirement since I believe bytecode-enhancement + lazy to-ones always want NO_PROXY there.</span>
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