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| <article data-swiftype-index='true'> |
| |
| <h1>Custom SQL Functions</h1> |
| |
| <div class="paragraph"> |
| <p>The SQL Engine can extend the SQL functions' set, defined by the ANSI-99 specification, via the addition of custom SQL functions written in Java.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A custom SQL function is just a public static method marked by the <code>@QuerySqlFunction</code> annotation.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="kd">static</span> <span class="kd">class</span> <span class="nc">SqlFunctions</span> <span class="o">{</span> |
| <span class="nd">@QuerySqlFunction</span> |
| <span class="kd">public</span> <span class="kd">static</span> <span class="kt">int</span> <span class="nf">sqr</span><span class="o">(</span><span class="kt">int</span> <span class="n">x</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="n">x</span> <span class="o">*</span> <span class="n">x</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The class that owns the custom SQL function has to be registered in the <code>CacheConfiguration</code>. |
| To do that, use the <code>setSqlFunctionClasses(…​)</code> method.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="c1">// Preparing a cache configuration.</span> |
| <span class="nc">CacheConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| |
| <span class="c1">// Registering the class that contains custom SQL functions.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setSqlFunctionClasses</span><span class="o">(</span><span class="nc">SqlFunctions</span><span class="o">.</span><span class="na">class</span><span class="o">);</span> |
| |
| <span class="nc">IgniteCache</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">createCache</span><span class="o">(</span><span class="n">cfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Once you have deployed a cache with the above configuration, you can call the custom function from within SQL queries:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="c1">// Preparing the query that uses the custom defined 'sqr' function.</span> |
| <span class="nc">SqlFieldsQuery</span> <span class="n">query</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">SqlFieldsQuery</span><span class="o">(</span><span class="s">"SELECT name FROM myCache WHERE sqr(size) > 100"</span><span class="o">);</span> |
| |
| <span class="c1">// Executing the query.</span> |
| <span class="n">cache</span><span class="o">.</span><span class="na">query</span><span class="o">(</span><span class="n">query</span><span class="o">).</span><span class="na">getAll</span><span class="o">();</span></code></pre> |
| </div> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| Classes registered with <code>CacheConfiguration.setSqlFunctionClasses(…​)</code> must be added to the classpath of all the nodes where the defined custom functions might be executed. Otherwise, you will get a <code>ClassNotFoundException</code> error when trying to execute the custom function. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </article> |
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