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<title>PostgreSql e Django - parte 3 por Regis da Silva // #PythonClub // </title>
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<h2 class="article-info">Regis da Silva</h2>
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<h1>PostgreSql e Django - parte 3</h1>
<p class="post-meta">
// Tags <a class="post-category" href="http://pythonclub.com.br/tag/python.html">python</a>
<a class="post-category" href="http://pythonclub.com.br/tag/postresql.html">postresql</a>
<a class="post-category" href="http://pythonclub.com.br/tag/banco-de-dados.html">banco de dados</a>
</p>
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<p>Se você já leu o <a class="reference external" href="http://pythonclub.com.br/tutorial-postgresql.html">Tutorial Postgresql - parte 1</a> e <a class="reference external" href="http://pythonclub.com.br/postgresql-e-python3.html">PostgreSql e Python3 - parte 2</a> , este post é uma continuação. Aqui nós veremos como usar <a class="reference external" href="http://www.postgresql.org/">PostgreSQL</a> no <a class="reference external" href="http://pythonclub.com.br/tutorial-django-17.html">Django</a>.</p>
<p>Para quem já leu <a class="reference external" href="http://twoscoopspress.com/products/two-scoops-of-django-1-6">Two Scoops of Django</a> sabe que o <a class="reference external" href="http://www.pydanny.com/">PyDanny</a> recomenda fortemente o uso do mesmo SGBD tanto em <strong>produção</strong> como em <strong>testes</strong>. Então esqueça <a class="reference external" href="http://pythonclub.com.br/guia-rapido-comandos-sqlite3.html">sqlite</a> para testes, use <a class="reference external" href="http://www.mysql.com/">MySql</a> ou <a class="reference external" href="http://www.oracle.com/br/products/database/overview/index.html">Oracle</a> ou <a class="reference external" href="http://www.postgresql.org/">PostgreSQL</a> tanto em produção como em testes, e é sobre este último que vamos falar agora.</p>
<div class="figure">
<img alt="postgresql_django.png" src="/images/regisdasilva/postgresql_django.png" />
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<p>Então vejamos aqui como configurar o Postgresql para ser usado no <a class="reference external" href="http://pythonclub.com.br/tutorial-django-17.html">Django</a>.</p>
<div class="section" id="precisamos-criar-o-banco-manualmente">
<h2>Precisamos criar o banco manualmente</h2>
<p>Começando...</p>
<div class="highlight"><pre><span class="nv">$ </span>sudo su - postgres
</pre></div>
<p>Veja o prompt:</p>
<div class="highlight"><pre>postgres@myuser:~<span class="err">$</span>
</pre></div>
<p>Criando o banco</p>
<div class="highlight"><pre><span class="nv">$ </span>createdb mydb
</pre></div>
<p>Se existir o banco faça</p>
<div class="highlight"><pre><span class="nv">$ </span>dropdb mydb
</pre></div>
<p>e crie novamente. Para sair digite</p>
<div class="highlight"><pre><span class="nv">$ </span><span class="nb">exit</span>
</pre></div>
</div>
<div class="section" id="id3">
<h2>Django</h2>
<p>Vamos criar um virtualenv e instalar o <a class="reference external" href="http://initd.org/psycopg/docs/install.html#use-a-python-package-manager">psycopg2</a>, além do django.</p>
<div class="highlight"><pre>virtualenv -p /usr/bin/python3 teste
<span class="nb">cd </span>teste
<span class="nb">source </span>bin/activate
pip install psycopg2 django
pip freeze
pip freeze > requirements.txt
</pre></div>
<p><strong>Dica</strong>: Para diminuir o caminho do prompt digite</p>
<div class="highlight"><pre><span class="nv">$ PS1</span><span class="o">=</span><span class="s2">"(`basename \"</span><span class="nv">$VIRTUAL_ENV</span><span class="s2">\"`):/\W</span><span class="nv">$ </span><span class="s2">"</span>
</pre></div>
<p><strong>Dica</strong>:</p>
<div class="highlight"><pre>vim ~/.bashrc +
<span class="nb">alias </span><span class="nv">manage</span><span class="o">=</span><span class="s1">'python $VIRTUAL_ENV/manage.py'</span>
</pre></div>
<p>Com isto nós podemos usar apenas <tt class="docutils literal">manage</tt> ao invés de <tt class="docutils literal">python manage.py</tt>.</p>
<div class="section" id="criando-o-projeto">
<h3>Criando o projeto</h3>
<div class="highlight"><pre>django-admin.py startproject myproject .
<span class="nb">cd </span>myproject
python ../manage.py startapp core
</pre></div>
<p><strong>Edite o settings.py</strong></p>
<div class="highlight"><pre><span class="n">DATABASES</span> <span class="o">=</span> <span class="p">{</span>
<span class="s">'default'</span><span class="p">:</span> <span class="p">{</span>
<span class="s">'ENGINE'</span><span class="p">:</span> <span class="s">'django.db.backends.postgresql_psycopg2'</span><span class="p">,</span>
<span class="s">'NAME'</span><span class="p">:</span> <span class="s">'mydb'</span><span class="p">,</span>
<span class="c"># 'NAME': os.path.join(BASE_DIR, 'mydb'),</span>
<span class="s">'USER'</span><span class="p">:</span> <span class="s">'myuser'</span><span class="p">,</span>
<span class="s">'PASSWORD'</span><span class="p">:</span> <span class="s">'mypassword'</span><span class="p">,</span>
<span class="s">'HOST'</span><span class="p">:</span> <span class="s">'127.0.0.1'</span><span class="p">,</span>
<span class="s">'PORT'</span><span class="p">:</span> <span class="s">''</span><span class="p">,</span> <span class="c"># 8000 is default</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<p><strong>Rode a aplicação</strong></p>
<div class="highlight"><pre>python manage.py migrate
python manage.py runserver
</pre></div>
<p><a class="reference external" href="http://127.0.0.1:8000/">http://127.0.0.1:8000/</a> ou <a class="reference external" href="http://localhost:8000/">http://localhost:8000/</a></p>
<p><strong>Edite o models.py</strong></p>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.db</span> <span class="kn">import</span> <span class="n">models</span>
<span class="kn">from</span> <span class="nn">django.utils.translation</span> <span class="kn">import</span> <span class="n">ugettext_lazy</span> <span class="k">as</span> <span class="n">_</span>
<span class="k">class</span> <span class="nc">Person</span><span class="p">(</span><span class="n">models</span><span class="o">.</span><span class="n">Model</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s">'Nome'</span><span class="p">),</span> <span class="n">max_length</span><span class="o">=</span><span class="mi">50</span><span class="p">)</span>
<span class="n">email</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">EmailField</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s">'e-mail'</span><span class="p">),</span> <span class="n">max_length</span><span class="o">=</span><span class="mi">30</span><span class="p">,</span> <span class="n">unique</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">age</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s">'Idade'</span><span class="p">))</span>
<span class="n">active</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">BooleanField</span><span class="p">(</span><span class="n">_</span><span class="p">(</span><span class="s">'Ativo'</span><span class="p">),</span> <span class="n">default</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">created_at</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">DateTimeField</span><span class="p">(</span>
<span class="n">_</span><span class="p">(</span><span class="s">'Criado em'</span><span class="p">),</span> <span class="n">auto_now_add</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">auto_now</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Meta</span><span class="p">:</span>
<span class="n">ordering</span> <span class="o">=</span> <span class="p">[</span><span class="s">'name'</span><span class="p">]</span>
<span class="n">verbose_name</span> <span class="o">=</span> <span class="s">"pessoa"</span>
<span class="n">verbose_name_plural</span> <span class="o">=</span> <span class="s">"pessoas"</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span>
</pre></div>
<p>Leia mais em</p>
<p><a class="reference external" href="http://pythonclub.com.br/tutorial-django-17.html">Tutorial Django 1.7</a></p>
<p><a class="reference external" href="http://pythonclub.com.br/criar-site-com-form-lista-30-min.html">Como criar um site com formulário e lista em 30 minutos?</a></p>
<p><strong>Edite o settings.py</strong> novamente</p>
<p>Em <em>INSTALLED_APPS</em> insira a app <em>core</em>.</p>
<div class="highlight"><pre><span class="n">INSTALLED_APPS</span> <span class="o">=</span> <span class="p">(</span>
<span class="o">...</span>
<span class="s">'myproject.core'</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
<p><strong>Faça um migrate</strong></p>
<div class="highlight"><pre>python manage.py makemigrations core
python manage.py migrate
python manage.py createsuperuser
</pre></div>
</div>
<div class="section" id="um-pouco-de-shell">
<h3>Um pouco de shell</h3>
<div class="highlight"><pre><span class="nv">$ </span>python manage.py shell
Python 3.4.0 <span class="o">(</span>default, Apr <span class="m">11</span> 2014, 13:05:18<span class="o">)</span>
<span class="o">[</span>GCC 4.8.2<span class="o">]</span> on linux
Type <span class="s2">"help"</span>, <span class="s2">"copyright"</span>, <span class="s2">"credits"</span> or <span class="s2">"license"</span> <span class="k">for</span> more information.
<span class="o">(</span>InteractiveConsole<span class="o">)</span>
>>>
</pre></div>
<p>Serve para manipular a app pelo <strong>terminal</strong>.</p>
<div class="highlight"><pre><span class="o">>>></span> <span class="kn">from</span> <span class="nn">myproject.core.models</span> <span class="kn">import</span> <span class="n">Person</span>
<span class="o">>>></span> <span class="n">p</span> <span class="o">=</span> <span class="n">Person</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'Regis'</span><span class="p">,</span><span class="n">email</span><span class="o">=</span><span class="s">'regis@example.com'</span><span class="p">,</span><span class="n">age</span><span class="o">=</span><span class="mi">35</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">id</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">name</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">email</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">age</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">active</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">created_at</span>
<span class="o">>>></span> <span class="n">p</span> <span class="o">=</span> <span class="n">Person</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'Xavier'</span><span class="p">,</span><span class="n">email</span><span class="o">=</span><span class="s">'xavier@example.com'</span><span class="p">,</span><span class="n">age</span><span class="o">=</span><span class="mi">66</span><span class="p">,</span><span class="n">active</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">persons</span> <span class="o">=</span> <span class="n">Person</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">all</span><span class="p">()</span><span class="o">.</span><span class="n">values</span><span class="p">()</span>
<span class="o">>>></span> <span class="k">for</span> <span class="n">person</span> <span class="ow">in</span> <span class="n">persons</span><span class="p">:</span> <span class="k">print</span><span class="p">(</span><span class="n">person</span><span class="p">)</span>
<span class="o">>>></span> <span class="nb">exit</span><span class="p">()</span>
</pre></div>
<p>Leia mais em</p>
<p><a class="reference external" href="http://pythonclub.com.br/tutorial-postgresql.html">Tutorial Postgresql - parte 1</a></p>
<p><a class="reference external" href="http://pythonclub.com.br/postgresql-e-python3.html">PostgreSql e Python3 - parte 2</a></p>
<p><a class="reference external" href="http://pythonclub.com.br/tutorial-django-17.html">Tutorial Django 1.7</a></p>
<p><a class="reference external" href="http://pythonclub.com.br/criar-site-com-form-lista-30-min.html">Como criar um site com formulário e lista em 30 minutos?</a></p>
<p><a class="reference external" href="https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-django-with-postgres-nginx-and-gunicorn">How To Install and Configure Django with Postgres, Nginx, and Gunicorn</a></p>
<p><a class="reference external" href="http://www.postgresql.org/docs/9.4/static/tutorial-createdb.html">http://www.postgresql.org/docs/9.4/static/tutorial-createdb.html</a></p>
<p><a class="reference external" href="http://www.postgresql.org/docs/9.4/static/index.html">http://www.postgresql.org/docs/9.4/static/index.html</a></p>
<p><a class="reference external" href="http://www.postgresql.org/docs/9.4/static/tutorial-sql.html">http://www.postgresql.org/docs/9.4/static/tutorial-sql.html</a></p>
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