voku / idiorm

   */

  protected static function _create_cache_key($query, $parameters, $table_name = null, $connection_name = self::DEFAULT_CONNECTION)

  {

    if (

        isset(static::$_config[$connection_name]['create_cache_key']) === true

        &&

        is_callable(static::$_config[$connection_name]['create_cache_key']) === true

    ) {

      return call_user_func_array(

          static::$_config[$connection_name]['create_cache_key'],

          array(

              $query,

              $parameters,

              $table_name,

              $connection_name,

          )

      );

    }

    $parameter_string = implode(',', $parameters);

    $key = $query . ':' . $parameter_string;

    // init

    static::$_query_cache = array();

    if (

        isset(static::$_config[$connection_name]['clear_cache']) === true

        &&

        is_callable(static::$_config[$connection_name]['clear_cache']) === true

    ) {

      return call_user_func_array(

          static::$_config[$connection_name]['clear_cache'],

          array(

              $table_name,

              $connection_name,

          )

      );

    }

    return false;

  }