code: def get_all_regions(db_connection):
      
  
      if not hasattr(get_all_regions, '_results'):
          sql = 'CALL get_all_regions();'
          results = execute_sql(sql, db_connection)
          get_all_regions._results = results
  
      return get_all_regions._results
docs: Gets a list of all regions.
  
      :return: A list of all regions. Results have regionID and regionName.
      :rtype: list