从错误1109到错误1242 MySQL

时间:2018-04-03 03:21:44

标签: mysql case mysql-error-1242

我正在使用一个程序从我们系统中的程序计算用户'间断'(也就是意外情况)的长度。它在确定用户状态的程序之后运行,具体取决于他们是否正在完成日常治疗以及程度。

此过程的目的是通过向具有以下模式的表添加行来记录用户意外事件的长度:

id_contingency int(11) NOT NULL AUTO_INCREMENT, id_user int(11) DEFAULT NULL, date_start date DEFAULT NULL, program_day int(11) DEFAULT NULL, date_end date DEFAULT NULL, total_days int(11) DEFAULT NULL, latest_tf_id archer(255) DEFAULT NULL

我考虑将此添加为user_status表更新的触发器,但我不能冒错误防止该表更新。因此,该程序首先关闭先前打开的突发事件,当用户第一次进入中断状态,但现在已经恢复该程序时,它随后为已经开始在其治疗中首次中断的用户开启新的突发事件。然后它会一直打开,直到他们恢复该程序,并计算他们处于中断状态的时间。

这是我原来的程序,它返回错误1109(未知表tbl_user_status):

DELIMITER $$
CREATE DEFINER=CURRENT_USER PROCEDURE `proc_cont_calc`
NO SQL 
BEGIN

#CLOSE OPEN CONTINGENCIES FIRST  or d0 > d1
CASE 
    WHEN tbl_user_status.d4 = 1 AND tbl_user_status.d2 > 0 AND tbl_user_status.user_status = 'seguimiento' THEN 
        UPDATE tbl_user_contingency, tbl_user_status SET 
        tbl_user_contingency.date_end = CURRENT_DATE,
        tbl_user_contingency.total_days = DATEDIFF(tbl_user_contingency.date_start, tbl_user_contingency.date_end),
        tbl_user_contingency.updated_by = 'proc_cont.close'
        WHERE tbl_user_contingency.date_end = '' AND tbl_user_contingency.id_smoker = tbl_user_status.id_smoker LIMIT 1;
#OPEN NEW CONTINGENCIES
    WHEN tbl_user_status.d5 = 1 AND tbl_user_status.d4 = 0 AND tbl_user_status.user_status = 'contingencia' THEN
        INSERT INTO tbl_user_contingency (id_smoker, roadmap_day, date_start, latest_tf_id, updated_by) SELECT 
        id_smoker, roadmap_day, CURRENT_DATE, latest_tf_id, 'proc_cont.open' FROM tbl_user_status;
END CASE;
END$$ 
DELIMITER;

所以我尝试了这个(除其他外):

CASE 
    WHEN (SELECT d4 FROM tbl_user_status) = 1 AND (SELECT d2 FROM tbl_user_status) > 0 AND (SELECT user_status FROM tbl_user_status) = 'seguimiento' THEN 
        UPDATE tbl_user_contingency, tbl_user_status SET 
        tbl_user_contingency.date_end = CURRENT_DATE,
        tbl_user_contingency.total_days = DATEDIFF(tbl_user_contingency.date_start, tbl_user_contingency.date_end),
        tbl_user_contingency.updated_by = 'proc_cont.close'
        WHERE tbl_user_contingency.id_smoker = tbl_user_status.id_smoker LIMIT 1;
#OPEN NEW CONTINGENCIES
    WHEN (SELECT d5 FROM tbl_user_status) = 1 AND (SELECT d4 FROM tbl_user_status) = 0 AND (SELECT user_status FROM tbl_user_status) = 'contingencia' THEN
        INSERT INTO tbl_user_contingency (id_smoker, roadmap_day, date_start, latest_tf_id, updated_by) SELECT 
        id_smoker, roadmap_day, CURRENT_DATE, latest_tf_id, 'proc_cont.open' FROM tbl_user_status;
END CASE;

现在我收到错误1242返回多行。

如何让此程序正常运行?谢谢!

更新 - 我尝试了@ P.Salmon的建议,只是更新行,但并非所有字段都填写完毕,或者更新超出以前的意外情况。

谢谢!

1 个答案:

答案 0 :(得分:0)

这里似乎没有必要使用case语句将条件移动到where子句,例如

UPDATE tbl_user_contingency join tbl_user_status on tbl_user_contingency.id_smoker = tbl_user_status.id_smoker 
    SET 
        tbl_user_contingency.date_end = CURRENT_DATE,
        tbl_user_contingency.total_days = DATEDIFF(tbl_user_contingency.date_start, tbl_user_contingency.date_end),
        tbl_user_contingency.updated_by = 'proc_cont.close'
WHERE tbl_user_contingency.date_end = '' AND
           tbl_user_status.d4 = 1 AND tbl_user_status.d2 > 0 AND tbl_user_status.user_status = 'seguimiento'
;

INSERT INTO tbl_user_contingency (id_smoker, roadmap_day, date_start, latest_tf_id, updated_by) 
SELECT 
        id_smoker, roadmap_day, CURRENT_DATE, latest_tf_id, 'proc_cont.open' 
FROM tbl_user_status
where tbl_user_status.d5 = 1 AND tbl_user_status.d4 = 0 AND tbl_user_status.user_status = 'contingencia'
;

通过添加表定义,示例数据和预期输出,您可以改进您的问题,从而获得更好的响应,如果您描述了您正在尝试做什么,而不是通过逆向工程两个非工作代码段来猜测作为你问题的文字。顺便说一下,我希望你有一种机制可以阻止这件事不止一次。