Question

我尝试在一个查询中获得多个Mysql更新查询，我有3个测试查询

UPDATE `stock` SET `date_time_out`='2016-12-05 13:47:05' WHERE `weighting_id` = '80' AND `date_time_out` = '0000-00-00 00:00:00'
UPDATE `stock` SET `date_time_out`='2016-12-05 13:46:05' WHERE `weighting_id` = '79' AND `date_time_out` = '0000-00-00 00:00:00'
UPDATE `stock` SET `date_time_out`='2016-12-05 13:45:05' WHERE `weighting_id` = '78' AND `date_time_out` = '0000-00-00 00:00:00'

我已经在查询后创建了查询，但它没有“

”

UPDATE `stock` 
SET value = CASE
WHEN  `weighting_id` = '80' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:47:05'
WHEN  `weighting_id` = '79' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:46:05'
WHEN  `weighting_id` = '78' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:45:05'
ELSE VALUE
END

Answer 1

你可以尝试这样：

   UPDATE `stock` 
    SET value = (CASE
    WHEN  `weighting_id` = '80' THEN '2016-12-05 13:47:05'
    WHEN  `weighting_id` = '79' THEN '2016-12-05 13:46:05'
    WHEN  `weighting_id` = '78' THEN '2016-12-05 13:45:05'         
    END
    ) WHERE weighting_id in ('80','79','78') AND `date_time_out` = '0000-00-00 00:00:00'

Answer 2

我发现答案以下代码可以正常工作：

UPDATE `stock` 
SET `date_time_out` = CASE
WHEN  `weighting_id` = '70' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:47:05'
WHEN  `weighting_id` = '71' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:48:05'
WHEN  `weighting_id` = '72' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:48:05'
WHEN  `weighting_id` = '73' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:48:05'
WHEN  `weighting_id` = '74' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:48:05'
WHEN  `weighting_id` = '75' AND `date_time_out` = '0000-00-00 00:00:00' THEN '2016-12-05 13:48:05'
ELSE `date_time_out`
END

WHERE `weighting_id` IN ('70', '71', '72', '73', '74', '75') AND `date_time_out` IN ('0000-00-00 00:00:00')

代码比5个单独的更新查询快约100X-150X。

mysql多次更新用2 x在哪里

2 个答案: