http://uralbash.ru/blog/tag/cidr/atom.xml 2011-11-16T00:42:00Z ABlog http://uralbash.ru/articles/2011/sqlalchemy_why_postgres/ 2011-11-16T00:42:00Z 2011-11-16T00:42:00Z Uralbash <div class="section" id="sqlalchemy-postgresql"> <p>Потому что я могу делать так:</p> <div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Net</span><span class="p">)</span> <span class="n">ip_type</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">GET</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;ip_type&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span> <span class="k">if</span> <span class="n">ip_type</span><span class="o">==</span><span class="s1">&#39;4&#39;</span><span class="p">:</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Net</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="s2">&quot;family(cidr)=4&quot;</span><span class="p">)</span> <span class="k">elif</span> <span class="n">ip_type</span><span class="o">==</span><span class="s1">&#39;6&#39;</span><span class="p">:</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Net</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="s2">&quot;family(cidr)=6&quot;</span><span class="p">)</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span><span class="o">.</span><span class="n">order_by</span><span class="p">(</span><span class="n">Net</span><span class="o">.</span><span class="n">cidr</span><span class="p">)</span><span class="o">.</span><span class="n">all</span><span class="p">()</span> </pre></div> </div> <p>Здесь если GET переменная <code class="docutils literal"><span class="pre">ip_type=4</span></code> то выбираются все строки где <code class="docutils literal"><span class="pre">cidr</span></code> IPv4, если 6 то все стоки где <code class="docutils literal"><span class="pre">cidr</span></code> IPv6, иначе просто отдается все. Для фильтрации используется стандартная функция <a class="reference external" href="http://postgresql.org">Postgres</a> <code class="docutils literal"><span class="pre">family</span></code>. Пример был так расписан для наглядности, теперь сократим:</p> <div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Net</span><span class="p">)</span> <span class="n">ip_type</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">GET</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;ip_type&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span> <span class="k">if</span> <span class="n">ip_type</span><span class="p">:</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Net</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="s2">&quot;family(cidr)=</span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="n">ip_type</span><span class="p">)</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span> <span class="o">=</span> <span class="n">c</span><span class="o">.</span><span class="n">nets</span><span class="o">.</span><span class="n">order_by</span><span class="p">(</span><span class="n">Net</span><span class="o">.</span><span class="n">cidr</span><span class="p">)</span><span class="o">.</span><span class="n">all</span><span class="p">()</span> </pre></div> </div> <p>По моему это просто шЫкарно.</p> <img alt="_static/2011/awesome.jpeg" src="_static/2011/awesome.jpeg" /> </div>