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<h1>10. Database Event Hooks</h1>
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<a class="link" href="hooks.html">Chapter Contents</a> | <a class="link" href="rowlevelsecurity.html" title="Row Level Security">Prev</a> | <a class="link" href="fn_dbev_startup.html" title="Database Startup">Next</a>
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<h2>Abstract</h2>
<p>Virtuoso provides a number of hooks that enable you to traps events
within the database such as startup, shutdown, connection, disconnection and
SQL compilation events.</p>
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<h2>Table of Contents</h2>
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<a class="sect1" href="fn_dbev_startup.html">10.1. Database Startup</a>
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<a class="sect1" href="fn_dbev_connect.html">10.2. Database Connections</a>
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<a class="sect1" href="fn_disconnect.html">10.4. Database Disconnections</a>
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<a class="sect1" href="fn_dbev_shutdown.html">10.5. Database Shutdown</a>
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<a class="sect1" href="fn_dbev_prepare.html">10.6. SQL Statement Preparation</a>
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<a class="sect1" href="sqlparsetree.html">10.7. SQL Parse Tree</a>
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<a class="sect2" href="sqlparsetree.html#notesonspecialparsetree">10.7.1. Notes on Special Features of the Parse Tree</a>
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<a class="sect2" href="sqlparsetree.html#sqlsecandparsetrees">10.7.2. SQL Security and Parse Trees</a>
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<a class="sect2" href="sqlparsetree.html#debuggingparsetree">10.7.3. Debugging with Parse Trees</a>
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<p>
Virtuoso allows the dba to set hooks for various events, such as:
</p>
<ul>
<li>Startup</li>
<li>Shutdown</li>
<li>Client Connect</li>
<li>Client Disconnect</li>
<li>Compilation of a Dynamic SQL Statement</li>
</ul>
<p>
These events are intercepted by calling a SQL procedure if one is defined.
</p>
<p>
In the following we will examine each hook in the context of a simplified
database security system. The system will record all logins
and logouts and will enforce custom security rules on reading a
specific application table.
</p>
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