如何轻松掌握对处理程序 进行实例化处理

static handler* tina_create_handler(TABLE *table);

static handler *myisam_create_handler(TABLE *table)
  {
    return new ha_myisam(table);
  }

ha_federated::ha_federated(TABLE *table_arg)
  :handler(&federated_hton, table_arg),
  mysql(0), stored_result(0), scan_flag(0),
  ref_length(sizeof(MYSQL_ROW_OFFSET)), current_position(0)
  {}

ha_example::ha_example(TABLE *table_arg)
  :handler(&example_hton, table_arg)
  {}