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<p class="title is-3">
<a href="/sql-magic.html" rel="bookmark" title="Permalink to SQL Magic">
SQL Magic
</a>
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<p class="subtitle is-5">
Thu 01 January 2015
</p>
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<hr>
<div class="content ">
<p>I'm finding the <code class="code">
%sql</code>
magic function extremely useful. It turns
IPython into a very nice front-end to Postgresql.</p>
<p>First, make sure you have the <code class="code">
ipython-sql</code>
extension installed:</p>
<p><pre>
pip install ipython-sql</pre>
</p>
<p><a class="reference external" href="https://pypi.python.org/pypi/ipython-sql">https://pypi.python.org/pypi/ipython-sql</a></p>
<p>Then we load the extension</p>
<div class="highlight"><pre><span></span><span class="o">%</span><span class="n">load_ext</span> <span class="n">sql</span>
</pre></div>
<p>Then we set up our database connection.</p>
<div class="highlight"><pre><span></span><span class="o">%%</span><span class="n">sql</span>
<span class="n">postgresql</span><span class="p">:</span><span class="o">//</span><span class="n">testuser</span><span class="p">:</span><span class="n">password</span><span class="nd">@localhost</span><span class="o">/</span><span class="n">test</span>
</pre></div>
<pre class="literal-block">
u'Connected: <a class="reference external" href="mailto:testuser@test">testuser@test</a>'
</pre>
<p>And now we can start interacting directly with the database as if we
were at the <code class="code">
psql</code>
command line.</p>
<div class="highlight"><pre><span></span><span class="o">%%</span><span class="n">sql</span>
<span class="n">CREATE</span> <span class="n">TABLE</span> <span class="n">people</span> <span class="p">(</span><span class="n">first</span> <span class="n">text</span><span class="p">,</span> <span class="n">last</span> <span class="n">text</span><span class="p">,</span> <span class="n">drink</span> <span class="n">text</span><span class="p">);</span>
<span class="n">INSERT</span> <span class="n">INTO</span> <span class="n">people</span> <span class="p">(</span><span class="n">first</span><span class="p">,</span><span class="n">last</span><span class="p">,</span><span class="n">drink</span><span class="p">)</span>
<span class="n">VALUES</span>
<span class="p">(</span><span class="s1">'zaphod'</span><span class="p">,</span><span class="s1">'beeblebrox'</span><span class="p">,</span><span class="s1">'pan galactic gargle blaster'</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'arthur'</span><span class="p">,</span><span class="s1">'dent'</span><span class="p">,</span><span class="s1">'tea'</span><span class="p">),</span>
<span class="p">(</span><span class="s1">'ford'</span><span class="p">,</span><span class="s1">'prefect'</span><span class="p">,</span><span class="s1">'old janx spirit'</span><span class="p">)</span>
<span class="p">;</span>
</pre></div>
<pre class="literal-block">
Done.
3 rows affected.
</pre>
<pre class="literal-block">
[]
</pre>
<div class="highlight"><pre><span></span><span class="o">%</span><span class="n">sql</span> <span class="n">select</span> <span class="o">*</span> <span class="kn">from</span> <span class="nn">people</span>
</pre></div>
<pre class="literal-block">
3 rows affected.
</pre>
<table class="table table-bordered table-striped is-striped is-bordered">
<tr>
<th>first</th>
<th>last</th>
<th>drink</th>
</tr>
<tr>
<td>zaphod</td>
<td>beeblebrox</td>
<td>pan galactic gargle blaster</td>
</tr>
<tr>
<td>arthur</td>
<td>dent</td>
<td>tea</td>
</tr>
<tr>
<td>ford</td>
<td>prefect</td>
<td>old janx spirit</td>
</tr>
</table><p>We can access the results as a python object:</p>
<div class="highlight"><pre><span></span><span class="n">result</span> <span class="o">=</span> <span class="o">%</span><span class="n">sql</span> <span class="n">select</span> <span class="o">*</span> <span class="kn">from</span> <span class="nn">people</span>
<span class="nb">len</span><span class="p">(</span><span class="n">result</span><span class="p">)</span>
</pre></div>
<pre class="literal-block">
3
</pre>
<p>And we can even get our recordset as a <strong>pandas</strong> dataframe</p>
<div class="highlight"><pre><span></span><span class="o">%</span><span class="n">config</span> <span class="n">SqlMagic</span><span class="o">.</span><span class="n">autopandas</span><span class="o">=</span><span class="bp">True</span>
</pre></div>
<div class="highlight"><pre><span></span><span class="n">frame</span> <span class="o">=</span> <span class="o">%</span><span class="n">sql</span> <span class="n">select</span> <span class="o">*</span> <span class="kn">from</span> <span class="nn">people</span>
<span class="n">frame</span>
</pre></div>
<div style="max-height:1000px;max-width:1500px;overflow:auto;">
<table class="table table-bordered table-striped is-striped is-bordered">
<thead>
<tr style="text-align: right;">
<th></th>
<th>first</th>
<th>last</th>
<th>drink</th>
</tr>
</thead>
<tbody>
<tr>
<th>0</th>
<td> zaphod</td>
<td> beeblebrox</td>
<td> pan galactic gargle blaster</td>
</tr>
<tr>
<th>1</th>
<td> arthur</td>
<td> dent</td>
<td> tea</td>
</tr>
<tr>
<th>2</th>
<td> ford</td>
<td> prefect</td>
<td> old janx spirit</td>
</tr>
</tbody>
</table>
<p>3 rows × 3 columns</p>
</div><div class="highlight"><pre><span></span><span class="n">frame</span><span class="p">[</span><span class="s1">'first'</span><span class="p">]</span><span class="o">.</span><span class="n">str</span><span class="o">.</span><span class="n">upper</span><span class="p">()</span>
</pre></div>
<pre class="literal-block">
0 ZAPHOD
1 ARTHUR
2 FORD
Name: first, dtype: object
</pre>
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