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<h1 class="topictitle1">Programming trigger actions</h1>



<div><p><span>Derby</span> allows
you to create triggers. When you create a trigger, you define an action or
set of actions that are executed when a database event occurs on a specified
table. A <em>database event</em> is a delete, insert, or update operation.</p>

<p>For example, if you define a trigger for a delete on a particular table,
the trigger action is executed whenever someone deletes a row or rows from
the table.</p>

<p>The <samp class="codeph">CREATE TRIGGER</samp> statement in the <cite><span><em>Java DB Reference Manual</em></span></cite> goes
into detail of the complete <samp class="codeph">CREATE TRIGGER</samp> syntax. This section
provides information on defining the trigger action itself, which is only
one aspect of creating triggers.</p>

<p>This section refers to the <samp class="codeph">CREATE TRIGGER</samp> statement as
the <em>trigger actions</em>.</p>

</div>

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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="cdevspecial53165.html">Trigger action overview</a></strong><br />
A trigger action is a simple SQL statement.</li>
<li class="ulchildlink"><strong><a href="cdevspecial76763.html">Performing referential actions</a></strong><br />
Derby provides referential actions. Examples in this section are included to illustrate how to write triggers.</li>
<li class="ulchildlink"><strong><a href="cdevspecial67260.html">Accessing before and after rows</a></strong><br />
Many trigger actions need to access the values of the rows being changed.</li>
<li class="ulchildlink"><strong><a href="cdevspecial13670.html">Examples of trigger actions</a></strong><br />
</li>
<li class="ulchildlink"><strong><a href="cdevspecial49460.html">Triggers and exceptions</a></strong><br />
Exceptions raised by triggers have a statement severity; they roll back the statement that caused the trigger to fire.</li>
</ul>

<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="cdevspecial.html" title="This section discusses special programming for Derby.">Derby server-side programming</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="cdevspecial42117.html" title="Methods invoked within an application are called application-side methods. Methods invoked within Derby are called database-side routines.">Programming database-side JDBC routines</a></div>
</div>
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