title: How to make QOCI driver available for PyQt5
body: <p>I'm trying to use <code>QOCI</code> driver to connect to Oracle Database, but the driver is not available. For this simple code:</p>
  <pre><code>from PyQt5 import QtSql
  
  QtSql.QSqlDatabase.isDriverAvailable('QOCI')
  </code></pre>
  <p>I get <code>False</code>.</p>
  <p>I tried checking the <code>PATH</code> environmental settings, and I see that there is <code>TNS_ADMIN</code> variable set to folder with driver file <code>oci.dll</code>:</p>
  <pre><code>C:\Atena\instantclient_11_2
  </code></pre>
  <p>but it's still unavailable.</p>
  <p>I tried downloading the driver from Oracle site, setting it up according to Oracle instructions (changing the <code>PATH</code> variable to the new driver folder, copying TNSnames.ora file etc.), but still the driver is unavailable.</p>
  <p>I want to have the driver available for PyQt5, load it, and the use it to connect to Oracle database.</p>