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Manipulation</a></li> +<li class="toctree-l2"><a class="reference internal" href="indexes.html">Secondary Indexes</a></li> +<li class="toctree-l2"><a class="reference internal" href="mvs.html">Materialized Views</a></li> +<li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li> +<li class="toctree-l2"><a class="reference internal" href="functions.html">Functions</a></li> +<li class="toctree-l2"><a class="reference internal" href="json.html">JSON Support</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="#">Triggers</a><ul> +<li class="toctree-l3"><a class="reference internal" href="#create-trigger">CREATE TRIGGER</a></li> +<li class="toctree-l3"><a class="reference internal" href="#drop-trigger">DROP TRIGGER</a></li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="appendices.html">Appendices</a></li> +<li class="toctree-l2"><a class="reference internal" href="changes.html">Changes</a></li> 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class="col-md-8"> + <div class="content doc-content"> + <div class="container"> + + <div class="section" id="triggers"> +<span id="cql-triggers"></span><h1>Triggers<a class="headerlink" href="#triggers" title="Permalink to this headline">¶</a></h1> +<p>Triggers are identified by a name defined by:</p> +<pre> +<strong id="grammar-token-trigger_name">trigger_name</strong> ::= <a class="reference internal" href="definitions.html#grammar-token-identifier"><code class="xref docutils literal"><span class="pre">identifier</span></code></a> +</pre> +<div class="section" id="create-trigger"> +<span id="create-trigger-statement"></span><h2>CREATE TRIGGER<a class="headerlink" href="#create-trigger" title="Permalink to this headline">¶</a></h2> +<p>Creating a new trigger uses the <code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">TRIGGER</span></code> statement:</p> +<pre> +<strong id="grammar-token-create_trigger_statement">create_trigger_statement</strong> ::= CREATE TRIGGER [ IF NOT EXISTS ] <a class="reference internal" href="#grammar-token-trigger_name"><code class="xref docutils literal"><span class="pre">trigger_name</span></code></a> + ON <a class="reference internal" href="ddl.html#grammar-token-table_name"><code class="xref docutils literal"><span class="pre">table_name</span></code></a> + USING <a class="reference internal" href="definitions.html#grammar-token-string"><code class="xref docutils literal"><span class="pre">string</span></code></a> +</pre> +<p>For instance:</p> +<div class="highlight-cql"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">TRIGGER</span> <span class="n">myTrigger</span> <span class="k">ON</span> <span class="n">myTable</span> <span class="k">USING</span> <span class="s1">'org.apache.cassandra.triggers.InvertedIndex'</span><span class="p">;</span> +</pre></div> +</div> +<p>The actual logic that makes up the trigger can be written in any Java (JVM) language and exists outside the database. +You place the trigger code in a <code class="docutils literal"><span class="pre">lib/triggers</span></code> subdirectory of the Cassandra installation directory, it loads during +cluster startup, and exists on every node that participates in a cluster. The trigger defined on a table fires before a +requested DML statement occurs, which ensures the atomicity of the transaction.</p> +</div> +<div class="section" id="drop-trigger"> +<span id="drop-trigger-statement"></span><h2>DROP TRIGGER<a class="headerlink" href="#drop-trigger" title="Permalink to this headline">¶</a></h2> +<p>Dropping a trigger uses the <code class="docutils literal"><span class="pre">DROP</span> <span class="pre">TRIGGER</span></code> statement:</p> +<pre> +<strong id="grammar-token-drop_trigger_statement">drop_trigger_statement</strong> ::= DROP TRIGGER [ IF EXISTS ] <a class="reference internal" href="#grammar-token-trigger_name"><code class="xref docutils literal"><span class="pre">trigger_name</span></code></a> ON <a class="reference internal" href="ddl.html#grammar-token-table_name"><code class="xref docutils literal"><span class="pre">table_name</span></code></a> +</pre> +<p>For instance:</p> +<div class="highlight-cql"><div class="highlight"><pre><span></span><span class="k">DROP</span> <span class="k">TRIGGER</span> <span class="n">myTrigger</span> <span class="k">ON</span> <span class="n">myTable</span><span class="p">;</span> +</pre></div> +</div> +</div> +</div> + + + + + <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation"> + + <a href="appendices.html" class="btn btn-default pull-right " role="button" title="Appendices" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a> + + + <a href="json.html" class="btn btn-default" role="button" title="JSON Support" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a> + + </div> + + </div> + </div> + </div> + <div class="col-md-2"> + </div> + </div> +</div> + + <footer> + <div class="container"> + <div class="col-md-4 social-blk"> + <span class="social"> + <a href="https://twitter.com/cassandra" + class="twitter-follow-button" + data-show-count="false" data-size="large">Follow @cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + <a href="https://twitter.com/intent/tweet?button_hashtag=cassandra" + class="twitter-hashtag-button" + data-size="large" + data-related="ApacheCassandra">Tweet #cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + </span> + </div> + + <div class="col-md-8 trademark"> + <p>© 2016 <a href="http://apache.org">The Apache Software Foundation</a>. + Apache, the Apache feather logo, and Apache Cassandra are trademarks of The Apache Software Foundation. + <p> + </div> + </div><!-- /.container --> +</footer> + +<!-- Javascript. 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