code: def getStorageEngines(self):
          
          cur = self._conn.cursor()
          cur.execute("""SHOW STORAGE ENGINES;""")
          rows = cur.fetchall()
          if rows:
              return [row[0].lower() for row in rows if row[1] in ['YES', 'DEFAULT']]
          else:
              return []
docs: Returns list of supported storage engines.
          
          @return: List of storage engine names.