code: def _parse(self, e):
          
  
          # MySQL
          matches = re.search(r"^\(_mysql_exceptions\.OperationalError\) \(\d+, \"(.+)\"\)$", str(e))
          if matches:
              return matches.group(1)
  
          # PostgreSQL
          matches = re.search(r"^\(psycopg2\.OperationalError\) (.+)$", str(e))
          if matches:
              return matches.group(1)
  
          # SQLite
          matches = re.search(r"^\(sqlite3\.OperationalError\) (.+)$", str(e))
          if matches:
              return matches.group(1)
  
          # Default
          return str(e)
docs: Parses an exception, returns its message.