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  <div class="section" id="module-celery.backends.database">
<h1>Backend: Database - celery.backends.database<a class="headerlink" href="#module-celery.backends.database" title="Permalink to this headline">¶</a></h1>
<p>celery.backends.database</p>
<dl class="class">
<dt id="celery.backends.database.Backend">
<em class="property">
class </em><tt class="descclassname">celery.backends.database.</tt><tt class="descname">Backend</tt><big>(</big><em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend" title="Permalink to this definition">¶</a></dt>
<dd><p>The database backends. Using Django models to store task metadata.</p>
<dl class="method">
<dt id="celery.backends.database.Backend.cleanup">
<tt class="descname">cleanup</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.cleanup" title="Permalink to this definition">¶</a></dt>
<dd>Delete expired metadata.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.get_result">
<tt class="descname">get_result</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.get_result" title="Permalink to this definition">¶</a></dt>
<dd>Get the result for a task.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.get_status">
<tt class="descname">get_status</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.get_status" title="Permalink to this definition">¶</a></dt>
<dd>Get the status of a task.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.get_traceback">
<tt class="descname">get_traceback</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.get_traceback" title="Permalink to this definition">¶</a></dt>
<dd>Get the traceback of a failed task.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.init_periodic_tasks">
<tt class="descname">init_periodic_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.init_periodic_tasks" title="Permalink to this definition">¶</a></dt>
<dd>Create entries for all periodic tasks in the database.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.is_done">
<tt class="descname">is_done</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.is_done" title="Permalink to this definition">¶</a></dt>
<dd>Returns <tt class="xref docutils literal"><span class="pre">True</span></tt> if task with <tt class="docutils literal"><span class="pre">task_id</span></tt> has been executed.</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.run_periodic_tasks">
<tt class="descname">run_periodic_tasks</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.run_periodic_tasks" title="Permalink to this definition">¶</a></dt>
<dd><p>Run all waiting periodic tasks.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">a list of <tt class="docutils literal"><span class="pre">(task,</span> <span class="pre">task_id)</span></tt> tuples containing
the task class and id for the resulting tasks applied.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="celery.backends.database.Backend.store_result">
<tt class="descname">store_result</tt><big>(</big><em>task_id</em>, <em>result</em>, <em>status</em>, <em>traceback=None</em><big>)</big><a class="headerlink" href="#celery.backends.database.Backend.store_result" title="Permalink to this definition">¶</a></dt>
<dd>Store return value and status of an executed task.</dd></dl>

</dd></dl>

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