title: Cannot see SQL statements when logging in Django 2.1.4
body: <p>When trying to log SQL statements in Django I can see params, duration but not the SQL statement itself. The context parameter <code>sql</code> returns <code>None</code></p>
  
  <p>I am using MySQL as backend</p>
  
  <p>Settings setup:</p>
  
  <pre class="lang-py prettyprint-override"><code>DEBUG=True
  ...
  LOGGING = {
      'version': 1,
      'disable_existing_loggers': False,
      'formatters': {
          'verbose': {
              'format': '{levelname} SQL:{sql} {duration} params:{params}',
              'style': '{',
          }},
          'handlers': {
              'console': {
                  'level': 'DEBUG',
                  'class': 'logging.StreamHandler',
                  'formatter': 'verbose'
              }
          },
          'loggers': {
              'django.db.backends': {
                  'handlers': ['console'],
                  'level': 'DEBUG',
              },
          }
      }
  </code></pre>
  
  <p>Sample output:
  <code>DEBUG SQL:None 0.036980390548706055 params:(1,)</code></p>
  
  <p>So I can the duration, the parameters but not the SQL statements. And I do not know why.</p>
  
  <p>I have based my configuration on <a href="https://docs.djangoproject.com/en/dev/topics/logging/#django-db-backends" rel="nofollow noreferrer">https://docs.djangoproject.com/en/dev/topics/logging/#django-db-backends</a></p>