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<h1>Statement Attributes</h1>
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<h2 id="statement-attributes">Statement attributes<a class="headerlink" href="#statement-attributes" title="Permanent link">&para;</a></h2>
<p>The <a href="../delete/">@Delete</a>, <a href="../insert/">@Insert</a>, <a href="../query/">@Query</a>, <a href="../select/">@Select</a> and
<a href="../update/">@Update</a> annotations allow you to control some aspects of the execution of the
underlying statement, such as the consistency level, timeout, etc.</p>
<h3 id="as-a-parameter">As a parameter<a class="headerlink" href="#as-a-parameter" title="Permanent link">&para;</a></h3>
<p>If the <strong>last</strong> parameter of any of those methods is a <code>Function&lt;BoundStatementBuilder,
BoundStatementBuilder&gt;</code> (or <code>UnaryOperator&lt;BoundStatementBuilder&gt;</code>), the mapper will apply that
function to the statement before executing it:</p>
<div class="highlight"><pre><span></span><code><span class="nd">@Dao</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">interface</span> <span class="nc">ProductDao</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nd">@Select</span>
<span class="w"> </span><span class="n">Product</span><span class="w"> </span><span class="nf">findById</span><span class="p">(</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">productId</span><span class="p">,</span><span class="w"> </span><span class="n">Function</span><span class="o">&lt;</span><span class="n">BoundStatementBuilder</span><span class="p">,</span><span class="w"> </span><span class="n">BoundStatementBuilder</span><span class="o">&gt;</span><span class="w"> </span><span class="n">setAttributes</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">Function</span><span class="o">&lt;</span><span class="n">BoundStatementBuilder</span><span class="p">,</span><span class="w"> </span><span class="n">BoundStatementBuilder</span><span class="o">&gt;</span><span class="w"> </span><span class="n">statementFunction</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n">builder</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="na">setConsistencyLevel</span><span class="p">(</span><span class="n">DefaultConsistencyLevel</span><span class="p">.</span><span class="na">ONE</span><span class="p">).</span><span class="na">setPageSize</span><span class="p">(</span><span class="mi">500</span><span class="p">);</span>
<span class="n">Product</span><span class="w"> </span><span class="n">product</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">dao</span><span class="p">.</span><span class="na">findById</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">statementFunction</span><span class="p">);</span>
</code></pre></div>
<p>Use this if you need to execute the same DAO methods with different configurations that can change
dynamically.</p>
<p>If you reuse the same set of attributes often, you can store the function as a constant to reduce
allocation costs.</p>
<h3 id="as-an-annotation">As an annotation<a class="headerlink" href="#as-an-annotation" title="Permanent link">&para;</a></h3>
<p>Attributes can also be provided statically by annotating the method with <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/annotations/StatementAttributes.html">@StatementAttributes</a>:</p>
<div class="highlight"><pre><span></span><code><span class="nd">@Dao</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">interface</span> <span class="nc">ProductDao</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nd">@Select</span>
<span class="w"> </span><span class="nd">@StatementAttributes</span><span class="p">(</span><span class="n">consistencyLevel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;ONE&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">pageSize</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">500</span><span class="p">)</span>
<span class="w"> </span><span class="n">Product</span><span class="w"> </span><span class="nf">findById</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">productId</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
<p>It's possible to have both the annotation and the function parameter; in that case, the annotation
will be applied first, and the function second:</p>
<div class="highlight"><pre><span></span><code><span class="nd">@Dao</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">interface</span> <span class="nc">ProductDao</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nd">@Select</span>
<span class="w"> </span><span class="nd">@StatementAttributes</span><span class="p">(</span><span class="n">consistencyLevel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;ONE&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">pageSize</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">500</span><span class="p">)</span>
<span class="w"> </span><span class="n">Product</span><span class="w"> </span><span class="nf">findById</span><span class="p">(</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">productId</span><span class="p">,</span><span class="w"> </span><span class="n">Function</span><span class="o">&lt;</span><span class="n">BoundStatementBuilder</span><span class="p">,</span><span class="w"> </span><span class="n">BoundStatementBuilder</span><span class="o">&gt;</span><span class="w"> </span><span class="n">setAttributes</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Will use CL = QUORUM, page size = 500</span>
<span class="n">Product</span><span class="w"> </span><span class="n">product</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n">dao</span><span class="p">.</span><span class="na">findById</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">builder</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="na">setConsistencyLevel</span><span class="p">(</span><span class="n">DefaultConsistencyLevel</span><span class="p">.</span><span class="na">QUORUM</span><span class="p">));</span>
</code></pre></div>
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