如何在node.js中减去knex.raw中的查询答案

【问题标题】：How to subtract query in knex.raw in node.js如何在node.js中减去knex.raw中的查询
【发布时间】：2018-06-07 14:59:16
【问题描述】：

我已经在 mysql 中完成了这个查询，但我不知道如何在 knex.raw 中执行此操作。

    select ((select leave_trackers.available_leaves from leave_trackers) -
(SELECT ((DATEDIFF('2018-06-11', '2018-06-01') + 1) - 
(WEEK('2018-06-11') - WEEK('2018-06-01')) -
(case when weekday('2018-06-11') = 6 then 1 else 0 end) -
(SELECT IFNULL(sum(total), 0)
from
(
select count(holidays.date) as total
FROM holidays, leave_applications 
WHERE holidays.date between '2018-06-01' and '2018-06-01'
GROUP BY holiday_id) as holiday_leave 
)
) as available_leaves
FROM leaves
group by leave_id
));

有人可以帮我把它转换成 knex.raw 吗？

【问题讨论】：

标签： mysql node.js knex.js bookshelf.js

【解决方案1】：

knex.raw(`
select ((select leave_trackers.available_leaves from leave_trackers) -
(SELECT ((DATEDIFF('2018-06-11', '2018-06-01') + 1) - 
(WEEK('2018-06-11') - WEEK('2018-06-01')) -
(case when weekday('2018-06-11') = 6 then 1 else 0 end) -
(SELECT IFNULL(sum(total), 0)
from
(
select count(holidays.date) as total
FROM holidays, leave_applications 
WHERE holidays.date between '2018-06-01' and '2018-06-01'
GROUP BY holiday_id) as holiday_leave 
)
) as available_leaves
FROM leaves
group by leave_id
))
`).then(res => console.log(res));

如果这不起作用，我们需要更多关于问题所在的信息。

【讨论】：

谢谢@Mikael，但我没有从查询中得到回复，我认为问题在于减去中间的查询，knex.raw 不接受它
@akshara 在这种情况下，该查询也不应该在 SQL shell 中工作。您需要在此处添加一些代码来构建架构/填充数据库。任何其他查询是否有效？如果确实如此，您可以从查询中删除部分内容，以找出存在问题的确切位置。
是的，我已经像(DATEDIFF('2018-06-11', '2018-06-01') + 1) 和其他东西一样单独完成了查询，它工作正常但是当我减去查询它不起作用时，这是我的问题:-( @Mikael
谢谢！ @Mikael 我找到了答案并发布了它:-)

【解决方案2】：

我找到了解决方案:-)，

knex.raw('((select leave_trackers.available_leave_days from leave_trackers) - (select ((DATEDIFF(?, ?) + 1) - (WEEK(?) - WEEK(?)) - (case when weekday(?) = 6 then 1 else 0 end) - (SELECT IFNULL(sum(total), 0) from (select count(holidays.date) as total FROM holidays WHERE holidays.date between ? and ? && holidays.location_id = ?) as holiday_leave )) AS total_available_days)) AS total_available_leave_days',
                                        ['2018-06-11', '2018-06-01', '2018-06-11', '2018-06-01', '2018-06-11', '2018-06-01', '2018-06-11', '1']
                                    )

【讨论】：