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<span class="entry-title-info">Feb 02 · <a href="https://buhrmann.github.io/category/data-posts.html">Data Posts</a></span>
<h2 class="entry-title entry-title-tight">Sql to excel</h2>
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<p>A little python tool to execute an sql script (postgresql in this case, but should be easily modifiable for mysql etc.) and store the result in a csv or excel (xls file):</p>
<div class="highlight"><pre><span></span><span class="sd">"""</span>
<span class="sd">Executes an sql script and stores the result in a file.</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">os</span><span class="o">,</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">subprocess</span>
<span class="kn">import</span> <span class="nn">csv</span>
<span class="kn">from</span> <span class="nn">xlwt</span> <span class="kn">import</span> <span class="n">Workbook</span>
<span class="k">def</span> <span class="nf">sql_to_csv</span><span class="p">(</span><span class="n">sql_fnm</span><span class="p">,</span> <span class="n">csv_fnm</span><span class="p">):</span>
<span class="sd">""" Write result of executing sql script to txt file"""</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">sql_fnm</span><span class="p">,</span> <span class="s1">'r'</span><span class="p">)</span> <span class="k">as</span> <span class="n">sql_file</span><span class="p">:</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">sql_file</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="n">query</span> <span class="o">=</span> <span class="s2">"COPY ("</span> <span class="o">+</span> <span class="n">query</span> <span class="o">+</span> <span class="s2">") TO STDOUT WITH CSV HEADER"</span>
<span class="n">cmd</span> <span class="o">=</span> <span class="s1">'psql -c "'</span> <span class="o">+</span> <span class="n">query</span> <span class="o">+</span> <span class="s1">'"'</span>
<span class="k">print</span> <span class="n">cmd</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">check_output</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="n">shell</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">csv_fnm</span><span class="p">,</span> <span class="s1">'wb'</span><span class="p">)</span> <span class="k">as</span> <span class="n">csv_file</span><span class="p">:</span>
<span class="n">csv_writer</span> <span class="o">=</span> <span class="n">csv</span><span class="o">.</span><span class="n">writer</span><span class="p">(</span><span class="n">csv_file</span><span class="p">)</span>
<span class="n">rows</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">splitlines</span><span class="p">()</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">rows</span><span class="p">:</span>
<span class="n">csv_writer</span><span class="o">.</span><span class="n">writerow</span><span class="p">(</span><span class="n">row</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">','</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">sql_to_xsl</span><span class="p">(</span><span class="n">sql_fnm</span><span class="p">,</span> <span class="n">xls_fnm</span><span class="p">):</span>
<span class="sd">""" Write result of executing sql script to xls file"""</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">sql_fnm</span><span class="p">,</span> <span class="s1">'r'</span><span class="p">)</span> <span class="k">as</span> <span class="n">sql_file</span><span class="p">:</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">sql_file</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="n">query</span> <span class="o">=</span> <span class="s2">"COPY ("</span> <span class="o">+</span> <span class="n">query</span> <span class="o">+</span> <span class="s2">") TO STDOUT WITH CSV HEADER"</span>
<span class="n">cmd</span> <span class="o">=</span> <span class="s1">'psql -c "'</span> <span class="o">+</span> <span class="n">query</span> <span class="o">+</span> <span class="s1">'"'</span>
<span class="k">print</span> <span class="n">cmd</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">check_output</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="n">shell</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">book</span> <span class="o">=</span> <span class="n">Workbook</span><span class="p">()</span>
<span class="n">sheet</span> <span class="o">=</span> <span class="n">book</span><span class="o">.</span><span class="n">add_sheet</span><span class="p">(</span><span class="s1">'Sheet 1'</span><span class="p">)</span>
<span class="n">rows</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">splitlines</span><span class="p">()</span>
<span class="k">for</span> <span class="n">row_idx</span><span class="p">,</span> <span class="n">row</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">rows</span><span class="p">):</span>
<span class="n">values</span> <span class="o">=</span> <span class="n">row</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">','</span><span class="p">)</span>
<span class="k">for</span> <span class="n">col_idx</span><span class="p">,</span> <span class="n">val</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">values</span><span class="p">):</span>
<span class="n">sheet</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">row_idx</span><span class="p">,</span> <span class="n">col_idx</span><span class="p">,</span> <span class="n">val</span><span class="p">)</span>
<span class="n">book</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">xls_fnm</span><span class="p">)</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
<span class="n">sqlfnm</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">outfnm</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="n">sql_to_xsl</span><span class="p">(</span><span class="n">sqlfnm</span><span class="p">,</span> <span class="n">outfnm</span><span class="p">)</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
</pre></div>
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Published on <span class="published">February 02, 2015</span><br>
Written by <span class="author">Thomas Buhrmann</span><br>
Posted in <span class="label label-default"><a href="https://buhrmann.github.io/category/data-posts.html">Data Posts</a></span>
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