<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.db — Django 1.6.7 documentation</title> <link rel="stylesheet" href="../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../', VERSION: '1.6.7', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <link rel="top" title="Django 1.6.7 documentation" href="../../index.html" /> <link rel="up" title="Module code" href="../index.html" /> <script type="text/javascript" src="../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; 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Note that TIME_ZONE is used</span> <span class="c"># by the PostgreSQL backends.</span> <span class="c"># We load all these up for backwards compatibility, you should use</span> <span class="c"># connections['default'] instead.</span> <span class="k">class</span> <span class="nc">DefaultConnectionProxy</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Proxy for accessing the default DatabaseWrapper object's attributes. If you</span> <span class="sd"> need to access the DatabaseWrapper object itself, use</span> <span class="sd"> connections[DEFAULT_DB_ALIAS] instead.</span> <span class="sd"> """</span> <span class="k">def</span> <span class="nf">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">connections</span><span class="p">[</span><span class="n">DEFAULT_DB_ALIAS</span><span class="p">],</span> <span class="n">item</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__setattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> <span class="k">return</span> <span class="nb">setattr</span><span class="p">(</span><span class="n">connections</span><span class="p">[</span><span class="n">DEFAULT_DB_ALIAS</span><span class="p">],</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__delattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span> <span class="k">return</span> <span class="nb">delattr</span><span class="p">(</span><span class="n">connections</span><span class="p">[</span><span class="n">DEFAULT_DB_ALIAS</span><span class="p">],</span> <span class="n">name</span><span class="p">)</span> <span class="n">connection</span> <span class="o">=</span> <span class="n">DefaultConnectionProxy</span><span class="p">()</span> <span class="k">class</span> <span class="nc">DefaultBackendProxy</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Temporary proxy class used during deprecation period of the `backend` module</span> <span class="sd"> variable.</span> <span class="sd"> """</span> <span class="nd">@cached_property</span> <span class="k">def</span> <span class="nf">_backend</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s">"Accessing django.db.backend is deprecated."</span><span class="p">,</span> <span class="ne">PendingDeprecationWarning</span><span class="p">,</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span> <span class="k">return</span> <span class="n">load_backend</span><span class="p">(</span><span class="n">connections</span><span class="p">[</span><span class="n">DEFAULT_DB_ALIAS</span><span class="p">]</span><span class="o">.</span><span class="n">settings_dict</span><span class="p">[</span><span class="s">'ENGINE'</span><span class="p">])</span> <span class="k">def</span> <span class="nf">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_backend</span><span class="p">,</span> <span class="n">item</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__setattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> <span class="k">return</span> <span class="nb">setattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_backend</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__delattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span> <span class="k">return</span> <span class="nb">delattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_backend</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span> <span class="n">backend</span> <span class="o">=</span> <span class="n">DefaultBackendProxy</span><span class="p">()</span> <span class="k">def</span> <span class="nf">close_connection</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span> <span class="s">"close_connection is superseded by close_old_connections."</span><span class="p">,</span> <span class="ne">PendingDeprecationWarning</span><span class="p">,</span> <span class="n">stacklevel</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span> <span class="c"># Avoid circular imports</span> <span class="kn">from</span> <span class="nn">django.db</span> <span class="kn">import</span> <span class="n">transaction</span> <span class="k">for</span> <span class="n">conn</span> <span class="ow">in</span> <span class="n">connections</span><span class="p">:</span> <span class="c"># If an error happens here the connection will be left in broken</span> <span class="c"># state. Once a good db connection is again available, the</span> <span class="c"># connection state will be cleaned up.</span> <span class="n">transaction</span><span class="o">.</span><span class="n">abort</span><span class="p">(</span><span class="n">conn</span><span class="p">)</span> <span class="n">connections</span><span class="p">[</span><span class="n">conn</span><span class="p">]</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> <span class="c"># Register an event to reset saved queries when a Django request is started.</span> <span class="k">def</span> <span class="nf">reset_queries</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="k">for</span> <span class="n">conn</span> <span class="ow">in</span> <span class="n">connections</span><span class="o">.</span><span class="n">all</span><span class="p">():</span> <span class="n">conn</span><span class="o">.</span><span class="n">queries</span> <span class="o">=</span> <span class="p">[]</span> <span class="n">signals</span><span class="o">.</span><span class="n">request_started</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">reset_queries</span><span class="p">)</span> <span class="c"># Register an event to reset transaction state and close connections past</span> <span class="c"># their lifetime. NB: abort() doesn't do anything outside of a transaction.</span> <span class="k">def</span> <span class="nf">close_old_connections</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="k">for</span> <span class="n">conn</span> <span class="ow">in</span> <span class="n">connections</span><span class="o">.</span><span class="n">all</span><span class="p">():</span> <span class="c"># Remove this when the legacy transaction management goes away.</span> <span class="k">try</span><span class="p">:</span> <span class="n">conn</span><span class="o">.</span><span class="n">abort</span><span class="p">()</span> <span class="k">except</span> <span class="n">DatabaseError</span><span class="p">:</span> <span class="k">pass</span> <span class="n">conn</span><span class="o">.</span><span class="n">close_if_unusable_or_obsolete</span><span class="p">()</span> <span class="n">signals</span><span class="o">.</span><span class="n">request_started</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">close_old_connections</span><span class="p">)</span> <span class="n">signals</span><span class="o">.</span><span class="n">request_finished</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">close_old_connections</span><span class="p">)</span> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3>Browse</h3> <ul> </ul> <h3>You are here:</h3> <ul> <li> <a href="../../index.html">Django 1.6.7 documentation</a> <ul><li><a href="../index.html">Module code</a> <ul><li>django.db</li></ul> </li></ul> </li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <h3>Last update:</h3> <p class="topless">Sep 26, 2014</p> </div> </div> <div id="ft"> <div class="nav"> <a href="../index.html" title="Module code" accesskey="U">up</a></div> </div> </div> <div class="clearer"></div> </div> </body> </html>