Time Based Reservation System - Only 1 Query Should Succeed
a user can select a time they want and submit the page
* The code selects all the bookings for a range of time.
* It then counts how many concurrent bookings there are for each hour.
* If there's less than the total (4) it inserts another row ( the user's requested booking ) into the booking table.
We also notify people if there has been a cancellation
This has led to a situation where a few different people are trying to book the same session at the same time, and succeeding!
We've ended up with 5 sessions booked
In the course of 2 page requests this seems to happen:
User1 - submits their booking
site selects to see if there's availability ( there is!)
User2 - submits their booking
site selects to see if there's availability ( there still is!)
site inserts User1's booking
site inserts User2's booking
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