kayrx 0.7.5

The Kayrx Framework
Documentation 
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  <div class="doc-content">        <h1 id="database">Database</h1>
<h2 id="diesel">Diesel</h2>
<p>{{% alert %}}
NOTE: The <code>actix-web</code> 1.0 version of this section is still
<a href="https://github.com/cldershem/actix-website/tree/update1.0-db">being updated</a>. Checkout
this <a href="https://github.com/actix/examples/tree/master/async_db">example</a> until then.
{{% /alert %}}</p>
<p>At the moment, Diesel 1.0 does not support asynchronous operations,
but it's possible to use the <code>actix</code> synchronous actor system as a database interface api.</p>
<p>Technically, sync actors are worker style actors. Multiple sync actors
can be run in parallel and process messages from same queue. Sync actors work in mpsc mode.</p>
<p>Let's create a simple database api that can insert a new user row into a SQLite table.
We must define a sync actor and a connection that this actor will use. The same approach
can be used for other databases.</p>
<p>{{&lt; include-example example=&quot;og_databases&quot; file=&quot;<a href="http://main.rs">main.rs</a>&quot; section=&quot;actor&quot; &gt;}}</p>
<p>This is the definition of our actor. Now, we must define the <em>create user</em> message and response.</p>
<p>{{&lt; include-example example=&quot;og_databases&quot; file=&quot;<a href="http://main.rs">main.rs</a>&quot; section=&quot;message&quot; &gt;}}</p>
<p>We can send a <code>CreateUser</code> message to the <code>DbExecutor</code> actor, and as a result, we will receive a
<code>User</code> model instance. Next, we must define the handler implementation for this message.</p>
<p>{{&lt; include-example example=&quot;og_databases&quot; file=&quot;<a href="http://main.rs">main.rs</a>&quot; section=&quot;handler&quot; &gt;}}</p>
<p>That's it! Now, we can use the <em>DbExecutor</em> actor from any http handler or middleware.
All we need is to start <em>DbExecutor</em> actors and store the address in a state where http handler
can access it.</p>
<p>{{&lt; include-example example=&quot;og_databases&quot; file=&quot;<a href="http://main.rs">main.rs</a>&quot; section=&quot;main&quot; &gt;}}</p>
<p>We will use the address in a request handler. The handle returns a future object;
thus, we receive the message response asynchronously.
<code>Route::a()</code> must be used for async handler registration.</p>
<p>{{&lt; include-example example=&quot;og_databases&quot; file=&quot;<a href="http://main.rs">main.rs</a>&quot; section=&quot;index&quot; &gt;}}</p>
<blockquote>
<p>A full example is available in the <a href="https://github.com/actix/examples/tree/master/diesel/">examples directory</a>.</p>
</blockquote>
<blockquote>
<p>More information on sync actors can be found in the
<a href="https://docs.rs/actix/0.7.0/actix/sync/index.html">actix documentation</a>.</p>
</blockquote>



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