Updating single row by multiple users at the same time

Hi,
I have been asked to develop an application where a single row from a table will be accessed by multiple users. Even multiple users can try to update the same row at the same time. So, to provide a solution of this problem should it be the best way to lock that particular row when user requesting to update it and after completion of commit the lock will be released. In the same time if some other user request to update the same row then it will be in the wait condition.
Please provide suggestion that is it the best way to handle the situation or not. If it is then can you also please provide an example (with sample code) of it.
Regards,
Koushik

It depends entirely on how the system was built.
You could relatively easily build an application that does something like
- Select a row with as last_updated_date column
- Update the row specifying the last_updated_date you had selected in your WHERE clause
- If the update updates 1 row, it was successful, otherwise inform the user that the row was already updated.
In this case, the second user would get an error indicating that the seat had already been purchased.
You could also relatively easily do a SELECT FOR UPDATE to prevent users from ever getting an error between the time they select a seat and the time they finish their transaction. Of course, if the user wanders away from the computer, or inadvertently ends up locking dozens of rows, this tends to rather problematic in practice. You may find that when the train pulls out of the station, someone that never ended up buying a ticket has locked a dozen rows so you lost a dozen sales. If you have a call center where operators are reserving seats for people on the phone, you may decide that explicit locking is more appropriate because you're confident that the operators aren't going to leave tickets locked for long periods of time and the cost of having the customer walked through the seat selection process multiple times would be higher than the cost of having rows locked longer than they need to be.
Justin

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