MySQL查询与PHP之间的运算符之间的问题

Question

我有MySQL表“ room_booking”，该表包含两列“ start_time”和“ end_time”。我想检查一下会议室的预定时间。假设从2:10 PM到3:15 PM预订了房间。然后，此时不应插入另一个条目。 我的查询是

$queryCheck = "SELECT start_time,end_time FROM room_booking AND (SELECT * FROM (room_booking) WHERE (start_time NOT BETWEEN '".$new_start_time."' AND '".$end_start_time."') AND (end_time NOT BETWEEN '".$new_start_time."' AND '".$end_start_time."'))";

Answer 1

在我看来，这只是重叠范围问题，在这种情况下，您想返回与输入开始时间和结束时间不重叠的记录。尝试以下查询：

SELECT *
FROM room_booking
WHERE existing_end < ? OR existing_start > ?;

对于上面的两个?占位符，您将按顺序绑定$new_start_time和$end_start_time。因此，您将得到以下查询：

SELECT *
FROM room_booking
WHERE existing_end > $new_start_time OR existing_start > $end_start_time;

Answer 2

您可以使用这个：-

INSERT INTO `room_booking` (`room`,`start_time`,`end_time`) 
SELECT 'A','2019-02-25 07:55:00','2019-02-25 08:00:00' FROM `room_booking`
WHERE NOT EXISTS
    (SELECT * FROM `room_booking` WHERE '2019-02-25 07:55:00' BETWEEN `start_time` AND `end_time`)

让我知道您是否有疑问？

我附上屏幕截图以作解释。