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<h1>Overview</h1>
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<h2 id="statements">Statements<a class="headerlink" href="#statements" title="Permanent link">&para;</a></h2>
<h3 id="quick-overview">Quick overview<a class="headerlink" href="#quick-overview" title="Permanent link">&para;</a></h3>
<p>What you pass to <code>session.execute()</code>.</p>
<ul>
<li>three types: simple (textual query), bound (prepared) and batch.</li>
<li>built-in implementations are <strong>immutable</strong>. Setters always return a new object, don't ignore the
result.</li>
</ul>
<hr />
<p>To execute a CQL query, you create a <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/Statement.html">Statement</a> instance and pass it to
<a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/session/Session.html#execute-com.datastax.oss.driver.api.core.cql.Statement-">Session#execute</a> or <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/session/Session.html#executeAsync-com.datastax.oss.driver.api.core.cql.Statement-">Session#executeAsync</a>. The driver provides various
implementations:</p>
<ul>
<li><a href="simple/">SimpleStatement</a>: a simple implementation built directly from a character string.
Typically used for queries that are executed only once or a few times.</li>
<li><a href="prepared/">BoundStatement (from PreparedStatement)</a>: obtained by binding values to a prepared
query. Typically used for queries that are executed often, with different values.</li>
<li><a href="batch/">BatchStatement</a>: a statement that groups multiple statements to be executed as a batch.</li>
</ul>
<p>All statement types share a <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/StatementBuilder.html">common set of execution attributes</a>, that can be set
through either setters or a builder:</p>
<ul>
<li><a href="../configuration/">execution profile</a> name, or the profile itself if it's been built dynamically.</li>
<li><a href="../idempotence/">idempotent flag</a>.</li>
<li><a href="../tracing/">tracing flag</a>.</li>
<li><a href="../query_timestamps/">query timestamp</a>.</li>
<li><a href="../paging/">page size and paging state</a>.</li>
<li><a href="per_query_keyspace/">per-query keyspace</a> (Cassandra 4 or above).</li>
<li><a href="../load_balancing/#token-aware">token-aware routing</a> information (keyspace and key/token).</li>
<li>normal and serial consistency level.</li>
<li>query timeout.</li>
<li>custom payload to send arbitrary key/value pairs with the request (you should only need this if
you have a custom query handler on the server).</li>
</ul>
<p>When setting these attributes, keep in mind that statements are <strong>immutable</strong>, and every method
returns a different instance:</p>
<div class="highlight"><pre><span></span><code><span class="n">SimpleStatement</span><span class="w"> </span><span class="n">statement</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n">SimpleStatement</span><span class="p">.</span><span class="na">newInstance</span><span class="p">(</span><span class="s">&quot;SELECT release_version FROM system.local&quot;</span><span class="p">);</span>
<span class="c1">// Won&#39;t work: statement isn&#39;t modified in place</span>
<span class="n">statement</span><span class="p">.</span><span class="na">setConfigProfileName</span><span class="p">(</span><span class="s">&quot;oltp&quot;</span><span class="p">);</span>
<span class="n">statement</span><span class="p">.</span><span class="na">setIdempotent</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
<span class="c1">// Instead, reassign the statement every time:</span>
<span class="n">statement</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">statement</span><span class="p">.</span><span class="na">setConfigProfileName</span><span class="p">(</span><span class="s">&quot;oltp&quot;</span><span class="p">).</span><span class="na">setIdempotent</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
</code></pre></div>
<p>All of these mutating methods are annotated with <code>@CheckReturnValue</code>. Some code analysis tools --
such as <a href="https://errorprone.info/">ErrorProne</a> -- can check correct usage at build time, and report
mistakes as compiler errors.</p>
<p>Note that some attributes can either be set programmatically, or inherit a default value defined in
the <a href="../configuration/">configuration</a>. Namely, these are: idempotent flag, query timeout,
consistency levels and page size. We recommended the configuration approach whenever possible (you
can create execution profiles to capture common combinations of those options).</p>
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