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| <span class="md-ellipsis"> |
| GraalVM |
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| </span> |
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| </a> |
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| Shaded JAR |
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| BOM |
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| Index |
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| Index |
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| Creating an Index (CREATE INDEX) |
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| Custom Indices |
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| Column Index Types |
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| Index options |
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| Dropping an Index (DROP INDEX) |
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| Keyspace |
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| Materialized View |
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| Table |
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| Type |
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| Truncate |
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| Condition |
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| Relation |
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| Term |
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| Idempotence |
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| </nav> |
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| Mapper |
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| Mapper |
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| Overview |
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| Entities |
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| DAOs |
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| <span class="md-nav__icon md-icon"></span> |
| DAOs |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <a href="../../../mapper/daos/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Overview |
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| </span> |
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| <a href="../../../mapper/daos/custom_types/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Custom Types |
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| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/delete/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Delete |
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| </span> |
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| </a> |
| </li> |
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| <a href="../../../mapper/daos/getentity/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Get Entity |
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| </span> |
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| </li> |
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| <a href="../../../mapper/daos/increment/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Increment |
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| </span> |
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| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/insert/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Insert |
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| </span> |
| |
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| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/null_saving/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Null Saving |
| |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/query/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Query |
| |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/queryprovider/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Query Provider |
| |
| </span> |
| |
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| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/select/" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| Select |
| |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/setentity/" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| Set Entity |
| |
| </span> |
| |
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| </li> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/statement_attributes/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Statement Attributes |
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| </span> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/daos/update/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Update |
| |
| </span> |
| |
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| </a> |
| </li> |
| |
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| </ul> |
| </nav> |
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| <li class="md-nav__item"> |
| <a href="../../../mapper/mapper/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Mapper |
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| </li> |
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| <span class="md-ellipsis"> |
| Configuration |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
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| Configuration |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| |
| <h1 id="index">Index<a class="headerlink" href="#index" title="Permanent link">¶</a></h1> |
| <p>An index provides a means of expanding the query capabilities of a table. <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/querybuilder/SchemaBuilder.html">SchemaBuilder</a> offers |
| API methods for creating and dropping indices. Unlike other schema members, there is no mechanism |
| to alter an index.</p> |
| <h3 id="creating-an-index-create-index">Creating an Index (CREATE INDEX)<a class="headerlink" href="#creating-an-index-create-index" title="Permanent link">¶</a></h3> |
| <p>To start a <code>CREATE INDEX</code> query, use <code>createIndex</code> in <a href="https://docs.datastax.com/en/drivers/java/4.17/com/datastax/oss/driver/api/querybuilder/SchemaBuilder.html">SchemaBuilder</a>:</p> |
| <div class="highlight"><pre><span></span><code><span class="kn">import static</span><span class="w"> </span><span class="nn">com.datastax.oss.driver.api.querybuilder.SchemaBuilder.*</span><span class="p">;</span> |
| |
| <span class="c1">// an index name is not required</span> |
| <span class="n">CreateIndexStart</span><span class="w"> </span><span class="n">create</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createIndex</span><span class="p">();</span> |
| |
| <span class="n">create</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createIndex</span><span class="p">(</span><span class="s">"my_idx"</span><span class="p">);</span> |
| </code></pre></div> |
| <p>Unlike other keyspace elements, there is not option to provide the keyspace name, instead it is |
| implied from the indexed table's keyspace.</p> |
| <p>Like all other <code>CREATE</code> queries, one may supply <code>ifNotExists()</code> to require that the index should |
| only be created if it doesn't already exist, i.e.:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">CreateIndexStart</span><span class="w"> </span><span class="n">create</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createIndex</span><span class="p">(</span><span class="s">"my_idx"</span><span class="p">).</span><span class="na">ifNotExists</span><span class="p">();</span> |
| </code></pre></div> |
| <p>Note one small difference with <code>IF NOT EXISTS</code> with indices is that the criteria also applies to |
| whether or not the table and column specification has an index already, not just the name of the |
| index.</p> |
| <p>At this stage, the query cannot be completed yet. You need to provide at least:</p> |
| <ul> |
| <li>The table the index applies to using <code>onTable</code></li> |
| <li>The column the index applies to using an <code>andColumn*</code> implementation.</li> |
| </ul> |
| <p>For example:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">createIndex</span><span class="p">().</span><span class="na">onTable</span><span class="p">(</span><span class="s">"tbl"</span><span class="p">).</span><span class="na">andColumnKeys</span><span class="p">(</span><span class="s">"addresses"</span><span class="p">);</span> |
| <span class="c1">// CREATE INDEX ON tbl (KEYS(addresses))</span> |
| </code></pre></div> |
| <h4 id="custom-indices">Custom Indices<a class="headerlink" href="#custom-indices" title="Permanent link">¶</a></h4> |
| <p>Cassandra supports indices with a custom implementation, specified by an input class name. The |
| class implementation may be specified using <code>custom(className)</code>, for example:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">createIndex</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">custom</span><span class="p">(</span><span class="s">"org.apache.cassandra.index.MyCustomIndex"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">onTable</span><span class="p">(</span><span class="s">"tbl"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">andColumn</span><span class="p">(</span><span class="s">"x"</span><span class="p">);</span> |
| <span class="c1">// CREATE CUSTOM INDEX ON tbl (x) USING 'org.apache.cassandra.index.MyCustomIndex'</span> |
| </code></pre></div> |
| <p>One popular custom index implementation is SASI (SSTable Attached Secondary Index). To use SASI, |
| use <code>usingSASI</code> and optionally <code>withSASIOptions</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">createIndex</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">usingSASI</span><span class="p">()</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">onTable</span><span class="p">(</span><span class="s">"tbl"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">andColumn</span><span class="p">(</span><span class="s">"x"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">withSASIOptions</span><span class="p">(</span><span class="n">ImmutableMap</span><span class="p">.</span><span class="na">of</span><span class="p">(</span><span class="s">"mode"</span><span class="p">,</span><span class="w"> </span><span class="s">"CONTAINS"</span><span class="p">,</span><span class="w"> </span><span class="s">"tokenization_locale"</span><span class="p">,</span><span class="w"> </span><span class="s">"en"</span><span class="p">));</span> |
| <span class="c1">// CREATE CUSTOM INDEX ON tbl (x) USING 'org.apache.cassandra.index.sasi.SASIIndex' WITH OPTIONS={'mode':'CONTAINS','tokenization_locale':'en'}</span> |
| </code></pre></div> |
| <h4 id="column-index-types">Column Index Types<a class="headerlink" href="#column-index-types" title="Permanent link">¶</a></h4> |
| <p>When indexing columns, one may simply use <code>andColumn</code>. However, when indexing collection columns |
| there are several additional options available:</p> |
| <ul> |
| <li><code>andColumnKeys</code>: Creates an index on a map column's keys.</li> |
| <li><code>andColumnValues</code>: Creates an index on a map column's values.</li> |
| <li><code>andColumnEntries</code>: Creates an index on a map column's entries.</li> |
| <li><code>andColumnFull</code>: Creates an index of a frozen collection's full value.</li> |
| </ul> |
| <h4 id="index-options">Index options<a class="headerlink" href="#index-options" title="Permanent link">¶</a></h4> |
| <p>After specifying the columns for the index, you may use <code>withOption</code> to provide free-form options on |
| the index. These are really only applicable to custom index implementations.</p> |
| <h3 id="dropping-an-index-drop-index">Dropping an Index (DROP INDEX)<a class="headerlink" href="#dropping-an-index-drop-index" title="Permanent link">¶</a></h3> |
| <p>To create a <code>DROP INDEX</code> query, use <code>dropIndex</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">dropIndex</span><span class="p">(</span><span class="s">"ks"</span><span class="p">,</span><span class="w"> </span><span class="s">"my_idx"</span><span class="p">);</span> |
| <span class="c1">// DROP INDEX ks.my_idx</span> |
| </code></pre></div> |
| <p>You may also specify <code>ifExists</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">dropIndex</span><span class="p">(</span><span class="s">"my_idx"</span><span class="p">).</span><span class="na">ifExists</span><span class="p">();</span> |
| <span class="c1">// DROP INDEX IF EXISTS my_idx</span> |
| </code></pre></div> |
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