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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-10868" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-43dea790-416d-44cc-b50d-5c31029e1b20" 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-10868" style="color: #3b73af; text-decoration: none">HHH-10868</a> </td>
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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-10868" style="color: #3b73af; text-decoration: none">Allow non-null columns with default values and still set component to null</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-43dea790-416d-44cc-b50d-5c31029e1b20" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </td>
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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"> Unassigned </td>
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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"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 19/Jun/2016 13:00 PM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-minor-58f8556f-f949-413c-a184-bef742ce7a63" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </td>
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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="djmj" id="email_djmj" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=djmj" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marco Janc</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Currently if any column that is mapped by a component is non-null the component will be initialized.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Feature:</b></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I would suggest to allow a column have an optional default value, and if the value equals the default value the component will be null. So even if column <em>flag</em> is not null but <em>0</em> the variable <em>fooComp</em> will still be null.</p>
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<b>Component.xml</b>
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<component name=<span class="code-quote" style="color: #009100">"fooComp"</span> class=<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">package</span>.FooComp"</span>>
<property name=<span class="code-quote" style="color: #009100">"name"</span>/>
<property name=<span class="code-quote" style="color: #009100">"flag"</span> <span class="code-keyword" style="color: #000091">default</span>=<span class="code-quote" style="color: #009100">"0"</span>/>
</component>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This makes it easier for other queries to check against <em>flag</em> or similar columns, since a cumbersome construct like <em>COALESCE(flag, 0) = 1</em> is not required.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>Example:</b></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">By default we make all our bit fields non-null, since null mostly indicates a three-way logic.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We had a table <em>foo</em> with two columns we wanted to map to a composite:</p>
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<b>Foo.sql</b>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
test INT NOT NULL,
name VARCHAR(64) NULL,
flag BIT NOT NULL DEFAULT = 0
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<b>Foo.java</b>
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<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">int</span> test;
<span class="code-keyword" style="color: #000091">private</span> FooComp fooComp;
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<b>FooComp.java</b>
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@NotBlank
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">boolean</span> flag;
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">With the column <em>flag</em> being non nullable the component was always initialized, which was not desired. So we had to make it nullable, replicate default in queries using <em>COALESCE(flag, 0)</em> and add <em>@NotNull</em> to <em>flag</em>.</p> </td>
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