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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-10739" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-7fc20576-a201-4404-86fb-255f541030ba" 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-10739" style="color: #3b73af; text-decoration: none">HHH-10739</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-10739" style="color: #3b73af; text-decoration: none">Custom Type - Class to constant</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-7fc20576-a201-4404-86fb-255f541030ba" 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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<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"> 11/May/2016 15:57 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-00f871c7-0ff1-4122-b69e-16105705ed0d" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </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">Reporter:</th>
<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">One can use the provided <em>ClassType</em> to map a <em>java.lang.Class</em> to a <em>VARCHAR</em>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This approach has a lot of drawbacks.</p>
<ul>
<li>The application specific full classname is saved in the database. When different application wants to access same database problem arises if different code base is used.</li>
<li>Violates separation of concern aswell it is prone to refactorization. When packages or class names are refactored it requires database batch updates which is just unnecessary maintenance work, especially in production.</li>
<li>VARCHAR is used which is harder to index, especially in unique database constraints</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">My first idea was a converter for mapped entities that converts their class to their real table names. So instead of saving <em>package.entities.MyFoo</em> in database it is converted to <em>my_foo</em> instead. The metadata is available in <em>ClassMetaData</em> of configuration.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">For my use case this is sufficient but it is restricted to mapped classes. So why not use a configuration element to define those mappings.</p>
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<pre class="code-xml" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091"><classMappingType></span>
<span class="code-tag" style="color: #000091"><class=<span class="code-quote" style="color: #009100">"package.entities.MyFoo"</span> value=<span class="code-quote" style="color: #009100">"my_foo"</span>/></span>
<span class="code-tag" style="color: #000091"><class=<span class="code-quote" style="color: #009100">"package.entities.MyBar"</span> value=<span class="code-quote" style="color: #009100">"my_bar"</span>/></span>
<span class="code-tag" style="color: #000091"></classMappingType></span>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Add targeted SQL type:</p>
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<span class="code-tag" style="color: #000091"><classMappingType></span>
<span class="code-tag" style="color: #000091"><class=<span class="code-quote" style="color: #009100">"package.entities.MyFoo"</span> value=<span class="code-quote" style="color: #009100">"1"</span> type=<span class="code-quote" style="color: #009100">"long"</span>/></span>
<span class="code-tag" style="color: #000091"><class=<span class="code-quote" style="color: #009100">"package.entities.MyBar"</span> value=<span class="code-quote" style="color: #009100">"2"</span> type=<span class="code-quote" style="color: #009100">"long"</span>/></span>
<span class="code-tag" style="color: #000091"></classMappingType></span>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This approach resolves all mentioned disadvantages of using <em>ClassType</em>.</p> </td>
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