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Posted to commits@cassandra.apache.org by ty...@apache.org on 2016/08/23 20:58:09 UTC
svn commit: r1757435 [13/30] - in /cassandra/site/publish/doc: 3.10/
3.10/architecture/ 3.10/configuration/ 3.10/cql/ 3.10/data_modeling/
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Added: cassandra/site/publish/doc/3.10/cql/triggers.html
URL: http://svn.apache.org/viewvc/cassandra/site/publish/doc/3.10/cql/triggers.html?rev=1757435&view=auto
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--- cassandra/site/publish/doc/3.10/cql/triggers.html (added)
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+ <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>
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