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<td style="vertical-align: top;; padding: 0; 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-10771?atlOrigin=eyJpIjoiODM5NTc2YjhjZTVmNDhhN2E4YzY0OTdkZmMzNjc0MzQiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: Non-optional bidirectional @OneToOne with @MapsId should respect the FetchType.LAZY contract</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0"><a href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058:1e0b0781-b847-4672-a21b-4e3d676447bd" class="user-hover" rel="DerEineDa" style="color: #3b73af; text-decoration: none">Christian Ciach</a> I've just tested your statement and got different results. For instance, if you run the <a href="https://github.com/vladmihalcea/high-performance-java-persistence/blob/951db3fb0f6e9e699d4023044aa6baaeaec54696/core/src/test/java/com/vladmihalcea/book/hpjp/hibernate/association/BidirectionalOneToOneNPlusOneTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><tt>BidirectionalOneToOneNPlusOneTest</tt></a>, and execute this test case:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Test
<span class="code-keyword" style="color: #000091">public</span> void test() {
doInJPA(entityManager -> {
<span class="code-keyword" style="color: #000091">for</span> (<span class="code-object" style="color: #910091">int</span> i = 0; i < 3; i++) {
Post post = <span class="code-keyword" style="color: #000091">new</span> Post(<span class="code-object" style="color: #910091">String</span>.format(<span class="code-quote" style="color: #009100">"Post nr. %d"</span>, i));
post.setDetails(<span class="code-keyword" style="color: #000091">new</span> PostDetails(<span class="code-quote" style="color: #009100">"Excellent!"</span>));
entityManager.persist(post);
}
});
doInJPA(entityManager -> {
List<Post> posts = entityManager.createQuery(
<span class="code-quote" style="color: #009100">"select p from Post p "</span> +
<span class="code-quote" style="color: #009100">"where p.title like <span class="code-quote" style="color: #009100">'Post nr.%'</span>"</span>, Post.class)
.getResultList();
});
}
</pre>
</div>
</div> <p style="margin: 10px 0 0">This is what you get:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-sql" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">call</span> <span class="code-keyword" style="color: #000091; color: #009100">next</span> <span class="code-keyword" style="color: #000091; color: #009100">value</span> <span class="code-keyword" style="color: #000091; color: #009100">for</span> hibernate_sequence"</span>], Params:[()]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">call</span> <span class="code-keyword" style="color: #000091; color: #009100">next</span> <span class="code-keyword" style="color: #000091; color: #009100">value</span> <span class="code-keyword" style="color: #000091; color: #009100">for</span> hibernate_sequence"</span>], Params:[()]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">call</span> <span class="code-keyword" style="color: #000091; color: #009100">next</span> <span class="code-keyword" style="color: #000091; color: #009100">value</span> <span class="code-keyword" style="color: #000091; color: #009100">for</span> hibernate_sequence"</span>], Params:[()]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post (title, id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?)"</span>], Params:[(Post nr. 0, 1)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post_details (created_by, created_on, post_id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?, ?)"</span>], Params:[(Excellent!, 2018-12-20 13:12:08.226, 1)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post (title, id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?)"</span>], Params:[(Post nr. 1, 2)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post_details (created_by, created_on, post_id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?, ?)"</span>], Params:[(Excellent!, 2018-12-20 13:12:08.297, 2)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post (title, id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?)"</span>], Params:[(Post nr. 2, 3)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">insert</span> <span class="code-keyword" style="color: #000091; color: #009100">into</span> post_details (created_by, created_on, post_id) <span class="code-keyword" style="color: #000091; color: #009100">values</span> (?, ?, ?)"</span>], Params:[(Excellent!, 2018-12-20 13:12:08.299, 3)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">select</span> bidirectio0_.id <span class="code-keyword" style="color: #000091; color: #009100">as</span> id1_0_, bidirectio0_.title <span class="code-keyword" style="color: #000091; color: #009100">as</span> title2_0_ <span class="code-keyword" style="color: #000091; color: #009100">from</span> post bidirectio0_ <span class="code-keyword" style="color: #000091; color: #009100">where</span> bidirectio0_.title <span class="code-keyword" style="color: #000091; color: #009100">like</span> <span class="code-quote" style="color: #009100">'Post nr.%'</span>"</span>], Params:[()]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">select</span> bidirectio0_.post_id <span class="code-keyword" style="color: #000091; color: #009100">as</span> post_id3_1_0_, bidirectio0_.created_by <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_1_1_0_, bidirectio0_.created_on <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_2_1_0_ <span class="code-keyword" style="color: #000091; color: #009100">from</span> post_details bidirectio0_ <span class="code-keyword" style="color: #000091; color: #009100">where</span> bidirectio0_.post_id=?"</span>], Params:[(1)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">select</span> bidirectio0_.post_id <span class="code-keyword" style="color: #000091; color: #009100">as</span> post_id3_1_0_, bidirectio0_.created_by <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_1_1_0_, bidirectio0_.created_on <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_2_1_0_ <span class="code-keyword" style="color: #000091; color: #009100">from</span> post_details bidirectio0_ <span class="code-keyword" style="color: #000091; color: #009100">where</span> bidirectio0_.post_id=?"</span>], Params:[(2)]
Query:[<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">select</span> bidirectio0_.post_id <span class="code-keyword" style="color: #000091; color: #009100">as</span> post_id3_1_0_, bidirectio0_.created_by <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_1_1_0_, bidirectio0_.created_on <span class="code-keyword" style="color: #000091; color: #009100">as</span> created_2_1_0_ <span class="code-keyword" style="color: #000091; color: #009100">from</span> post_details bidirectio0_ <span class="code-keyword" style="color: #000091; color: #009100">where</span> bidirectio0_.post_id=?"</span>], Params:[(3)]
</pre>
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</div> <p style="margin: 10px 0 0">Notice the N+1 query issue generated by the EAGER fetching of the parent-side one-to-one association. So, this is not fixed in 5.4.0.Final.</p> </td>
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