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Question : check if record is already locked
When a user retrieves a record, I would like to be able to check if the record has been locked by someone else. If not, I want to be able to lock it, run an update statement if needed and release the record again. I want that check to be done when the data is retrieved, regardless of whether the user chooses to change something on the form.
Which trigger should I use and how do I go about checking whether the record can be reserved or not?
Answer : check if record is already locked
if u use an "for update NOWAIT" in sql statement, THEN IT raise an exception saying it is locked, otherwise continue with updation.
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