How to avoid Primary Key violation?

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Hi there
In online booking systems for instance train ticket booking the when user click for new ticket he notice a seat is free.But at the time of clicking booking button get a message that the seat is reserved,if it s reserved by some1 prior to him.....

How to make this....?

When I work I get error message "Primary Key" violation (Eg)
Thank You in advance

Posted 1-Sep-10 1:14am

aswathy.s.88

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**Dalek Dave** · Answer 1 · 2010-09-01T01:16:00

Solution 1

You could 'Lock out' that seat for, say, 5 minutes, whilst booking.

Posted 1-Sep-10 1:16am

Dalek Dave

Simon_Whale · Answer 2 · 2010-09-01T01:25:00

Solution 2

couple of thoughts here to further DD's answer

have you thought of dealing with such error in the try catch area? or sql notification (asusming your using sql server 2005 or greater!)

Posted 1-Sep-10 1:25am

Simon_Whale