按时间预订

Question

我遇到了MySQL的问题，我试图获得所有保留，其中starttime大于'16：42'但小于'18：42'。我试过这个，但是当我使用'15：42'而不是'16：42'时，我仍然得到相同的结果。

import falcon


class MyAPI:

    def on_get(self, req, resp):
        # You can access self.session here
        # self.session.add(foo)
        # self.session.commit()

Answer 1

可能是您有一些转换问题..尝试使用显式转换

SELECT     * 
FROM       `tables` 
INNER JOIN reservation_table 
ON         `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON         reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON         customers.id = reservations.customer_id 
WHERE  `date` = '2016-11-02' 
   AND ( starttime <= str_to_date('19:42', '%H:%i' )
         AND starttime >= str_to_date('16:42' , '%H:%i')) 

Answer 2

如果starttime和endtime列的格式为TIME，则此查询可以解决您的问题：

因为正如mysql文档所说＆＃34;如果启用了NO_ZERO_DATE或NO_ZERO_IN_DATE SQL模式，则不允许零日期或部分日期。＆＃34; 您可能需要先执行此查询：

SET sql_mode = '';

然后是第二个（如果starttime和endtime列是TIME格式）：

SELECT     *
FROM       `tables` 
INNER JOIN reservation_table 
ON         `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON         reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON         customers.id = reservations.customer_id 
WHERE  `date` = '2016-11-02'
AND ( starttime <= str_to_date('19:42', '%H:%i')
    AND starttime >= str_to_date('16:42' , '%H:%i')) 

但如果这些列不是那种格式，请执行：

SELECT     *
FROM       `tables` 
INNER JOIN reservation_table 
ON         `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON         reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON         customers.id = reservations.customer_id 
WHERE  `date` = '2016-11-02'
AND ( str_to_date(starttime, '%H:%i') <= str_to_date('19:42', '%H:%i')
    AND str_to_date(starttime, '%H:%i') >= str_to_date('16:42' , '%H:%i'))