Question

TIMESTAMPDIFF(MINUTE overlapping dates when changing the interval

Asked by: ussher

bookings are contained in a mysql table.
bookings can only be entered in pre-set intervals.
The user can set the interval, but changes could cause bookings to overlap.

I need to make the php function checkOverlap($interval) to see if the new interval that the user wants to set is acceptable.

EXAMPLE:
current interval is 30 min
bookings in the system currently for  2009-1-16
booking1: 8:00 ~ 8:30
booking2: 8:30 ~ 9:00

The user wants to change the new acceptable booking interval to 60 minutes.  (this will cause the table that displays bookings to create a row every hour instead of every 30 min)

in the situation above changing the interval to 60 min will cause both booking 1 and booking 2 to try to occupy the same cell in the booking table which will break formatting.

checkOverlap() will take the users new desired booking interval and check to see if there are any conflicts.


help appreciated.

CREATE TABLE `booking` (
  `booking_id` int(11) NOT NULL auto_increment,
  `booking_starttime` timestamp NOT NULL default '0000-00-00 00:00:00',
  `booking_endtime` timestamp NOT NULL default '0000-00-00 00:00:00',
  PRIMARY KEY  (`booking_id`)
)
 
I think it has something to do with these MySql functions:
SELECT * FROM `booking`
where (TIMESTAMPDIFF(MINUTE, `booking_starttime`, `booking_endtime`) < $interval);
 
and a subquery
                                  
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Asked On
2009-01-24 at 01:34:45ID24079899
Tags

php mysql

Topics

MS SQL Server

,

MySQL Server

,

PHP and Databases

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Answers

 

by: ussherPosted on 2009-01-24 at 02:29:09ID: 23455865

got it, but want to save it to my knowledge base.

select TIMESTAMPADD(MINUTE, 30, THIS.booking_endtime) as withInterval ,
       THIS.booking_id, 
       THIS.booking_starttime,
       THIS.booking_endtime
  from `jamroom_apicos_booking` as THIS
 Where exists (	select NEXT.booking_starttime from `jamroom_apicos_booking` as NEXT
                 where TIMESTAMPADD(MINUTE, 30, THIS.booking_endtime) > NEXT.booking_starttime)
                                              
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20120131-EE-VQP-002

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