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6.4

TIMESTAMPDIFF(MINUTE overlapping dates when changing the interval

Asked by ussher in MS SQL Server, MySQL Server, PHP and Databases

Tags: php mysql

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. 
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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
[+][-]01/24/09 02:29 AM, ID: 23455865Accepted Solution

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About this solution

Zones: MS SQL Server, MySQL Server, PHP and Databases
Tags: php mysql
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Solution Provided By: ussher
Participating Experts: 0
Solution Grade: A
 
 
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