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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/OGM" style="color: #3b73af; text-decoration: none">Hibernate OGM</a> / <a href="https://hibernate.atlassian.net/browse/OGM-599" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-improvement-81e6b911-d5b1-428e-a9ba-869b5a800853" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/OGM-599" style="color: #3b73af; text-decoration: none">OGM-599</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/OGM-599" style="color: #3b73af; text-decoration: none">Consider mapping one-to-one mappings with @PrimaryKeyJoinColumn via relationship in Neo4j</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="gunnar.morling" id="email_gunnar.morling" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gunnar.morling" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gunnar Morling</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 mapping a one-to-one association using {{@PrimaryKeyJoinColumn}}, it may be beneficial to establish a relationship in Neo4j in order to save a node look-up and benefit from node navigation instead</span> <span class="diffaddedchars" style="background-color:#ddfade;"> (see {{SharedPrimaryKeyTest}} for an example)</span> <span class="diffcontext">.</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br /><br /></span> <span class="diffcontext"> That'd require some changes on the engine side, as the dialect is only invoked for the two duple operations (for each side of the association), but without any association meta-data.<br /><br />From [IRC|http://transcripts.jboss.org/channel/irc.freenode.org/%23hibernate-dev/2014/%23hibernate-dev.2014-09-12.log.html]:<br /><br />{quote}<br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">2014-09-12T13:13:39 <</span> <span class="diffcontext">gmorling</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> we don't materialize the reference as FK in RDMBS either, so why do you think it should be done for neo4j?</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13:13</span> <span class="diffcontext"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">2014-09-12T13:14:51 <</span> <span class="diffcontext">emmanuel</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> because in RDBMS, you can do joins freely. In k/v or documents you embed the data or not and if you don't you are a lookup away. But in Neo4J a lookup is the more expensive operation compared to a node jump</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13:14</span> <span class="diffcontext"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">2014-09-12T13:15:20 <</span> <span class="diffcontext">emmanuel</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> and I don't know if you can express Cypher queries on /implicit/ associations</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br />2014-09-12T13</span> <span class="diffcontext">:15</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">:26 <</span> <span class="diffcontext">gmorling</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> but if you want a relationship, why would you go for this sort of mapping than?</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br />2014-09-12T13</span> <span class="diffcontext">:15</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">:48 <</span> <span class="diffcontext">emmanuel</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> because it's conceptually beautiful :)</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br />2014-09-12T13</span> <span class="diffcontext">:15</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">:52 <</span> <span class="diffcontext">gmorling</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> lol</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br />2014-09-12T13</span> <span class="diffcontext">:15</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">:58 <</span> <span class="diffcontext">emmanuel</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> true if you write a neo4j only app, you would not</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> 13:15</span> <span class="diffcontext"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">2014-09-12T13:16:07 <</span> <span class="diffcontext">emmanuel</span> <span class="diffaddedchars" style="background-color:#ddfade;">></span> <span class="diffcontext"> but for a multi abckend app you might<br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">2014-09-12T13:16:17 <emmanuel> but even that I grant you remains an uncommon mapping<br /></span> <span class="diffcontext">{quote}</span>
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