MySQL-存储过程不返回结果集

Question

我在MySQL 5.5.22-Ubuntu上创建了一个过程，并在我的测试中应返回四行，但未返回任何内容。 我已经读过，很难返回一个结果集，我尝试了几种方法，但是都没有用（将select转换为@result ...）。 另外，我尝试从过程中运行选择，并且它正在返回，但是当我运行过程时，它什么都没有返回。 谁能帮我吗？

见下面我的程序代码：

DELIMITER $$


DROP PROCEDURE IF EXISTS `switchboard3b-scheduler`.`getCurrentAndNextScheduleItem`$$ 



CREATE DEFINER=`root`@`localhost` PROCEDURE `getCurrentAndNextScheduleItem`(IN screenId int, IN scheduleId int 

-- , OUT cursorScheduleItems int

)

BEGIN

-- select current item

 -- declare cursorScheduleItems cursor for 

(SELECT "CURRENT_ITEM" as "ITEM", si.id,si.start_time,si.end_time, si.play_through, c.filename,ct.command 

FROM schedule_item si JOIN channel_content cc ON si.channel_content_id = cc.id 

    JOIN content c ON cc.content_id = c.id 

    JOIN content_type ct ON c.content_type_id = ct.id 

WHERE si.channel_screen_id = @screenId 

    AND si.schedule_id = @scheduleId

    AND (si.day=0 OR si.day=DAYOFWEEK(DATE(NOW()))) 

    AND si.start_time <= NOW() 

    AND si.end_time > NOW() 

ORDER BY si.day DESC, si.start_time DESC LIMIT 1)

-- select next item for that day

UNION ALL

(SELECT "NEXT_ITEM_TODAY" as "ITEM", si.id,si.start_time,si.end_time, si.play_through, c.filename,ct.command 

FROM schedule_item si JOIN channel_content cc ON si.channel_content_id = cc.id 

    JOIN content c ON cc.content_id = c.id 

    JOIN content_type ct ON c.content_type_id = ct.id 

WHERE si.channel_screen_id = @screenId 

    AND si.schedule_id = @scheduleId

    AND (si.day=0 OR si.day=DAYOFWEEK(DATE(NOW()))) 

    AND si.start_time > NOW()

ORDER BY si.day DESC, si.start_time ASC LIMIT 1)

-- select first two items of the next day

UNION ALL

(SELECT "NEXT_ITEMS_TOMORROW" as "ITEM", si.id,si.start_time,si.end_time, si.play_through, c.filename,ct.command 

FROM schedule_item si JOIN channel_content cc ON si.channel_content_id = cc.id 

    JOIN content c ON cc.content_id = c.id 

    JOIN content_type ct ON c.content_type_id = ct.id 

WHERE si.channel_screen_id = @screenId 

    AND si.schedule_id = @scheduleId

    AND (si.day=0 OR si.day=DAYOFWEEK(DATE(NOW()+1)))

ORDER BY si.day DESC,si.start_time ASC LIMIT 2);

-- CLOSE cursorScheduleItems;

END $$



DELIMITER ;

我试图用命令调用它：

CALL getCurrentAndNextScheduleItem(1,4);

任何提示将不胜感激。

提前致谢！

Answer 1

您想返回什么？ 创建过程中未提及其类型。

Answer 2

可能是您的“输出”参数带有注释-

-- , OUT cursorScheduleItems int