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| <h1>Query Provider</h1> |
| |
| <!-- |
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| distributed with this work for additional information |
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| |
| <h2 id="query-provider-methods">Query provider methods<a class="headerlink" href="#query-provider-methods" title="Permanent link">¶</a></h2> |
| <p>Annotate a DAO method with <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/annotations/QueryProvider.html">@QueryProvider</a> to delegate the execution of the query to one of your |
| own classes:</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">SensorDao</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="nd">@QueryProvider</span><span class="p">(</span><span class="n">providerClass</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">FindSliceProvider</span><span class="p">.</span><span class="na">class</span><span class="p">,</span><span class="w"> </span><span class="n">entityHelpers</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SensorReading</span><span class="p">.</span><span class="na">class</span><span class="p">)</span> |
| <span class="w"> </span><span class="n">PagingIterable</span><span class="o"><</span><span class="n">SensorReading</span><span class="o">></span><span class="w"> </span><span class="nf">findSlice</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">id</span><span class="p">,</span><span class="w"> </span><span class="n">Integer</span><span class="w"> </span><span class="n">month</span><span class="p">,</span><span class="w"> </span><span class="n">Integer</span><span class="w"> </span><span class="n">day</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="cm">/* Schema:</span> |
| <span class="cm"> CREATE TABLE sensor_reading(sensor_id int, month int, day int, value double,</span> |
| <span class="cm"> PRIMARY KEY (id, month, day)</span> |
| <span class="cm"> WITH CLUSTERING ORDER BY (month DESC, day DESC);</span> |
| <span class="cm"> */</span> |
| </code></pre></div> |
| <p>Use this for requests that can't be expressed as static query strings. For example, we want the |
| <code>month</code> and <code>day</code> parameters above to be optional:</p> |
| <ul> |
| <li>if both are present, we query for a particular day: <code>WHERE id = ? AND month = ? AND day = ?</code></li> |
| <li>if <code>day</code> is null, we query for the whole month: <code>WHERE id = ? AND month = ?</code></li> |
| <li>if <code>month</code> is also null, we query the whole partition: <code>WHERE id = ?</code></li> |
| </ul> |
| <p>We assume that you've already written a corresponding <a href="../../entities/">entity</a> class:</p> |
| <div class="highlight"><pre><span></span><code><span class="nd">@Entity</span> |
| <span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">SensorReading</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="nd">@PartitionKey</span><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">id</span><span class="p">;</span> |
| <span class="w"> </span><span class="nd">@ClusteringColumn</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">month</span><span class="p">;</span> |
| <span class="w"> </span><span class="nd">@ClusteringColumn</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">day</span><span class="p">;</span> |
| <span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">value</span><span class="p">;</span> |
| <span class="w"> </span><span class="c1">// constructors, getters and setters omitted for conciseness</span> |
| <span class="p">}</span> |
| </code></pre></div> |
| <h3 id="provider-class">Provider class<a class="headerlink" href="#provider-class" title="Permanent link">¶</a></h3> |
| <p><a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/annotations/QueryProvider.html#providerClass--">@QueryProvider.providerClass()</a> indicates which class to delegate to. The mapper |
| will create one instance for each DAO instance.</p> |
| <p>This class must expose a constructor that is accessible from the DAO interface's package.</p> |
| <p>The first constructor argument must always be <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/MapperContext.html">MapperContext</a>. This is a utility type that |
| provides access to mapper- and DAO-level state. In particular, this is how you get hold of the |
| session.</p> |
| <p>If <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/annotations/QueryProvider.html#entityHelpers--">@QueryProvider.entityHelpers()</a> is specified, the constructor must take an |
| additional <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/EntityHelper.html">EntityHelper</a> argument for each provided entity class. We specified |
| <code>SensorReading.class</code> so our argument types are <code>(MapperContext, EntityHelper<SensorReading>)</code>.</p> |
| <p>An entity helper is a utility type generated by the mapper. One thing it can do is construct query |
| templates (with the <a href="../../../query_builder/">query builder</a>). We want to retrieve entities so we |
| use <code>selectStart()</code>, chain a first WHERE clause for the id (which is always present), and store the |
| result in a field for later use:</p> |
| <div class="highlight"><pre><span></span><code><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">FindSliceProvider</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">CqlSession</span><span class="w"> </span><span class="n">session</span><span class="p">;</span> |
| <span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">EntityHelper</span><span class="o"><</span><span class="n">SensorReading</span><span class="o">></span><span class="w"> </span><span class="n">sensorReadingHelper</span><span class="p">;</span> |
| <span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">Select</span><span class="w"> </span><span class="n">selectStart</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">FindSliceProvider</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">MapperContext</span><span class="w"> </span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">EntityHelper</span><span class="o"><</span><span class="n">SensorReading</span><span class="o">></span><span class="w"> </span><span class="n">sensorReadingHelper</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">session</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">context</span><span class="p">.</span><span class="na">getSession</span><span class="p">();</span> |
| <span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">sensorReadingHelper</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">sensorReadingHelper</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">selectStart</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">sensorReadingHelper</span><span class="p">.</span><span class="na">selectStart</span><span class="p">().</span><span class="na">whereColumn</span><span class="p">(</span><span class="s">"id"</span><span class="p">).</span><span class="na">isEqualTo</span><span class="p">(</span><span class="n">bindMarker</span><span class="p">());</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="p">...</span><span class="w"> </span><span class="c1">// (to be continued)</span> |
| </code></pre></div> |
| <h3 id="provider-method">Provider method<a class="headerlink" href="#provider-method" title="Permanent link">¶</a></h3> |
| <p><a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/mapper/annotations/QueryProvider.html#providerMethod--">@QueryProvider.providerMethod()</a> indicates which method to invoke on the provider |
| class. When it's not specified (as is our case), it defaults to the same name as the DAO method.</p> |
| <p>The provider method must be accessible from the DAO interface's package, and have the same |
| parameters and return type as the DAO method.</p> |
| <p>Here is the full implementation:</p> |
| <div class="highlight"><pre><span></span><code><span class="w"> </span><span class="p">...</span><span class="w"> </span><span class="c1">// public class FindSliceProvider (continued)</span> |
| |
| <span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">PagingIterable</span><span class="o"><</span><span class="n">SensorReading</span><span class="o">></span><span class="w"> </span><span class="nf">findSlice</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">id</span><span class="p">,</span><span class="w"> </span><span class="n">Integer</span><span class="w"> </span><span class="n">month</span><span class="p">,</span><span class="w"> </span><span class="n">Integer</span><span class="w"> </span><span class="n">day</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| |
| <span class="w"> </span><span class="c1">// (1) complete the query</span> |
| <span class="w"> </span><span class="n">Select</span><span class="w"> </span><span class="n">select</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">selectStart</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">month</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">select</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">select</span><span class="p">.</span><span class="na">whereColumn</span><span class="p">(</span><span class="s">"month"</span><span class="p">).</span><span class="na">isEqualTo</span><span class="p">(</span><span class="n">bindMarker</span><span class="p">());</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">day</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">select</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">select</span><span class="p">.</span><span class="na">whereColumn</span><span class="p">(</span><span class="s">"day"</span><span class="p">).</span><span class="na">isEqualTo</span><span class="p">(</span><span class="n">bindMarker</span><span class="p">());</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="c1">// (2) prepare</span> |
| <span class="w"> </span><span class="n">PreparedStatement</span><span class="w"> </span><span class="n">preparedStatement</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">session</span><span class="p">.</span><span class="na">prepare</span><span class="p">(</span><span class="n">select</span><span class="p">.</span><span class="na">build</span><span class="p">());</span> |
| |
| <span class="w"> </span><span class="c1">// (3) bind</span> |
| <span class="w"> </span><span class="n">BoundStatementBuilder</span><span class="w"> </span><span class="n">boundStatementBuilder</span><span class="w"> </span><span class="o">=</span> |
| <span class="w"> </span><span class="n">preparedStatement</span><span class="p">.</span><span class="na">boundStatementBuilder</span><span class="p">().</span><span class="na">setInt</span><span class="p">(</span><span class="s">"id"</span><span class="p">,</span><span class="w"> </span><span class="n">id</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">month</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">boundStatementBuilder</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">boundStatementBuilder</span><span class="p">.</span><span class="na">setInt</span><span class="p">(</span><span class="s">"month"</span><span class="p">,</span><span class="w"> </span><span class="n">month</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">day</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">boundStatementBuilder</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">boundStatementBuilder</span><span class="p">.</span><span class="na">setInt</span><span class="p">(</span><span class="s">"day"</span><span class="p">,</span><span class="w"> </span><span class="n">day</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="c1">// (4) execute and map the results</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">session</span><span class="p">.</span><span class="na">execute</span><span class="p">(</span><span class="n">boundStatementBuilder</span><span class="p">.</span><span class="na">build</span><span class="p">()).</span><span class="na">map</span><span class="p">(</span><span class="n">sensorReadingHelper</span><span class="p">::</span><span class="n">get</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </code></pre></div> |
| <ol> |
| <li> |
| <p>Retrieve the SELECT query that was started in the constructor, and append additional WHERE |
| clauses as appropriate.</p> |
| <p>Note that all query builder objects are immutable, so this creates a new instance every time, |
| there is no risk of corrupting the original field.</p> |
| </li> |
| <li> |
| <p>Prepare the resulting statement.</p> |
| <p><code>session.prepare</code> caches its results, so if we already prepared that particular combination, |
| there is no network call at this step.</p> |
| </li> |
| <li> |
| <p>Bind the parameters, according to the WHERE clauses we've generated.</p> |
| </li> |
| <li> |
| <p>Execute the request.</p> |
| <p>Another useful helper feature is mapping entities to/from low-level driver data structures: |
| <code>get</code> extracts a <code>SensorReading</code> from a <code>Row</code>, so by mapping it to the <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/cql/ResultSet.html">ResultSet</a> we get back |
| the desired <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/core/PagingIterable.html">PagingIterable<SensorReading></a>.</p> |
| </li> |
| </ol> |
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