/** * 获取数据表查询驱动对象 * @return XF_Db_Table_Select_Abstract */ public function getTableSelect() { if (self::$_select == NULL) { self::$_select = new XF_Db_Table_Select_Mysql($this); } else { //防止在 XF_Db_Table_Select_Interface 中无法获取当前Table已有的数据,所以要重新实例化 $class = get_class(self::$_select); self::$_select = new $class($this); } return self::$_select; }