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| Creating a Keyspace (CREATE KEYSPACE) |
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| Table |
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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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| 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 |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| <span class="md-ellipsis"> |
| Overview |
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| <span class="md-ellipsis"> |
| Custom Types |
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| </span> |
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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 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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| <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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| <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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| <a href="../../../mapper/daos/null_saving/" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Null Saving |
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| </span> |
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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 |
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| </span> |
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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 |
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| </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 |
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| </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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| <nav class="md-nav" data-md-level="3" aria-labelledby="__nav_2_7_5_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_2_7_5"> |
| <span class="md-nav__icon md-icon"></span> |
| Configuration |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| <span class="md-ellipsis"> |
| Overview |
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| <h1>Keyspace</h1> |
| |
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| |
| <h2 id="keyspace">Keyspace<a class="headerlink" href="#keyspace" title="Permanent link">¶</a></h2> |
| <p>A keyspace is a top-level namespace that defines a name, replication strategy and configurable |
| options. <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, altering and dropping keyspaces.</p> |
| <h3 id="creating-a-keyspace-create-keyspace">Creating a Keyspace (CREATE KEYSPACE)<a class="headerlink" href="#creating-a-keyspace-create-keyspace" title="Permanent link">¶</a></h3> |
| <p>To start a <code>CREATE KEYSPACE</code> query, use <code>createKeyspace</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="n">CreateKeyspaceStart</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">createKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">);</span> |
| </code></pre></div> |
| <p>Like all other <code>CREATE</code> queries, one may supply <code>ifNotExists()</code> to require that the keyspace should |
| only be created if it doesn't already exist, i.e.:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">CreateKeyspaceStart</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">createKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">).</span><span class="na">ifNotExists</span><span class="p">();</span> |
| </code></pre></div> |
| <p>Note that, at this stage, the query cannot be completed yet. You need to provide at least a |
| replication strategy. The two most widely used ones are SimpleStrategy and NetworkTopologyStrategy.</p> |
| <p>To provide a replication strategy, use one of the following API methods on <code>CreateKeyspaceStart</code>:</p> |
| <ul> |
| <li><code>withSimpleStrategy(int replicationFactor)</code></li> |
| <li><code>withNetworkTopologyStrategy(Map<String, Integer> replications)</code></li> |
| <li><code>withReplicationOptions(Map<String, Object> replicationOptions)</code></li> |
| </ul> |
| <p>For example, the following builds a completed <code>CreateKeyspace</code> using <code>NetworkTopologyStrategy</code> with |
| a replication factor of 2 in <code>east</code> and 3 in <code>west</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">CreateKeyspace</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">createKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="na">withNetworkTopologyStrategy</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">"east"</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s">"west"</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">));</span> |
| <span class="c1">// CREATE KEYSPACE cycling WITH replication={'class':'NetworkTopologyStrategy','east':2,'west':3}</span> |
| </code></pre></div> |
| <p>Optionally, once a replication factor is provided, one may provide additional configuration when |
| creating a keyspace:</p> |
| <ul> |
| <li><code>withDurableWrites(boolean durableWrites)</code></li> |
| <li><code>withOption(String name, Object value)</code></li> |
| </ul> |
| <h3 id="altering-a-keyspace-alter-keyspace">Altering a Keyspace (ALTER KEYSPACE)<a class="headerlink" href="#altering-a-keyspace-alter-keyspace" title="Permanent link">¶</a></h3> |
| <p>To start an <code>ALTER KEYSPACE</code> query, use <code>alterKeyspace</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">AlterKeyspaceStart</span><span class="w"> </span><span class="n">alterKeyspace</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">alterKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">);</span> |
| </code></pre></div> |
| <p>From here, you can modify the keyspace's replication and other settings:</p> |
| <ul> |
| <li><code>withSimpleStrategy(int replicationFactor)</code></li> |
| <li><code>withNetworkTopologyStrategy(Map<String, Integer> replications)</code></li> |
| <li><code>withReplicationOptions(Map<String, Object> replicationOptions)</code></li> |
| <li><code>withDurableWrites(boolean durableWrites)</code></li> |
| <li><code>withOption(String name, Object value)</code></li> |
| </ul> |
| <p>At least one of these operations must be used to return a completed <code>AlterKeyspace</code>, i.e.:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">alterKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">).</span><span class="na">withDurableWrites</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span> |
| <span class="c1">// ALTER KEYSPACE cycling WITH durable_writes=true</span> |
| </code></pre></div> |
| <h3 id="dropping-a-keyspace-drop-keyspace">Dropping a keyspace (DROP KEYSPACE)<a class="headerlink" href="#dropping-a-keyspace-drop-keyspace" title="Permanent link">¶</a></h3> |
| <p>To create a <code>DROP KEYSPACE</code> query, use <code>dropKeyspace</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">dropKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">);</span> |
| <span class="c1">// DROP KEYSPACE cycling</span> |
| </code></pre></div> |
| <p>You may also specify <code>ifExists</code>:</p> |
| <div class="highlight"><pre><span></span><code><span class="n">dropKeyspace</span><span class="p">(</span><span class="s">"cycling"</span><span class="p">).</span><span class="na">ifExists</span><span class="p">();</span> |
| <span class="c1">// DROP KEYSPACE IF EXISTS cycling</span> |
| </code></pre></div> |
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