<style>
/* Changing the layout to use less space for mobiles */
@media screen and (max-device-width: 480px), screen and (-webkit-min-device-pixel-ratio: 2) {
#email-body { min-width: 30em !important; }
#email-page { padding: 8px !important; }
#email-banner { padding: 8px 8px 0 8px !important; }
#email-avatar { margin: 1px 8px 8px 0 !important; padding: 0 !important; }
#email-fields { padding: 0 8px 8px 8px !important; }
#email-gutter { width: 0 !important; }
}
</style>
<div id="email-body">
<table id="email-wrap" align="center" border="0" cellpadding="0" cellspacing="0" style="background-color:#f0f0f0;color:#000000;width:100%;">
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<td id="email-page" style="padding:16px !important;">
<table align="center" border="0" cellpadding="0" cellspacing="0" style="background-color:#ffffff;border:1px solid #bbbbbb;color:#000000;width:100%;">
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<td bgcolor="#3e4c4e" style="background-color:#3e4c4e;color:#ffffff;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;line-height:1;"><img src="https://www.jboss.org/dms/hibernate/images/jira/jiraheader_hibernate.png" alt="" style="vertical-align:top;" /></td>
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<td id="email-banner" style="padding:32px 32px 0 32px;">
<table align="left" border="0" cellpadding="0" cellspacing="0" width="100%" style="width:100%;">
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<td style="color:#505050;font-family:Arial,FreeSans,Helvetica,sans-serif;padding:0;">
<img id="email-avatar" src="https://hibernate.onjira.com/secure/useravatar?avatarId=10162" alt="" height="48" width="48" border="0" align="left" style="padding:0;margin: 0 16px 16px 0;" />
<div id="email-action" style="padding: 0 0 8px 0;font-size:12px;line-height:18px;">
<a class="user-hover" rel="abuit" id="email_abuit" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=abuit" style="color:#6c797f;">Anne Buit</a>
commented on <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-6044'>HHH-6044</a>
</div>
<div id="email-summary" style="font-size:16px;line-height:20px;padding:2px 0 16px 0;">
<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-6044'><strong>Compound ID with auto-generated part produces exception</strong></a>
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<td id="email-fields" style="padding:0 32px 32px 32px;">
<table border="0" cellpadding="0" cellspacing="0" style="padding:0;text-align:left;width:100%;" width="100%">
<tr valign="top">
<td id="email-gutter" style="width:64px;white-space:nowrap;"></td>
<td>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<td colspan="2" style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 16px 0;width:100%;">
<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>The database design should not be dependent on the persistence layer implementation. </p>
<p>Consider the following situation:</p>
<p>Table A</p>
<ul class="alternate" type="square">
<li>a_id (identity, pk)</li>
<li>a_name (with unique constraint, a surrogate key)</li>
<li>...</li>
</ul>
<p>Table B</p>
<ul class="alternate" type="square">
<li>a_id (fk, pk)</li>
<li>b_id (identity, pk)</li>
<li>b_name (unique constraint)</li>
<li>...</li>
</ul>
<p>Table C</p>
<ul class="alternate" type="square">
<li>a_id (fk, pk)</li>
<li>c_id (identity, pk)</li>
<li>c_name (unique constraint)</li>
<li>...</li>
</ul>
<p>Table D</p>
<ul class="alternate" type="square">
<li>a_id (fk, pk)</li>
<li>b_id (fk, pk)</li>
<li>c_id (fk, pk)</li>
<li>...</li>
</ul>
<p>The foreign keys defined in the database guarantee that the records in Table B and Table C referenced by a record in Table D both reference the same table A. Regardless of which clients are using the database, this structure is protected by the foreign keys.</p>
<p>This structure makes a lot of sense in many situations, i.e:<br/>
Table A - projects<br/>
Table B - activities<br/>
Table C - resources<br/>
Table D - activity / resource assignments.</p>
<p>It is guaranteed that a resource of a certain project can only be assinged to an activity of the same project.</p>
<p>When Hibernate does not support composite PK's with an identity part, database designers will have to resort to either programming logic or making the surrogate key the primary key (and providing all the cascading options) to support this structure.</p></div>
<div style="color:#505050;padding:4px 0 0 0;"> </div>
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</td><!-- End #email-page -->
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<td style="color:#505050;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:10px;line-height:14px;padding: 0 16px 16px 16px;text-align:center;">
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</table><!-- End #email-wrap -->
</div><!-- End #email-body -->