Trigger that sums free days
Hi to all,
I try to write a trigger that fires after an insert or update that drives me crazy!
My problem is the following: I have a table HOLIDAYS where I have all my free days in a year, always the name and than the number of days, e.g. ('smith', 5). Totally I have 30 days free a year which I can plan. But when I take at least 20 days free from january to march and / or from october to december I get one more day free, so I have 31 days then. I tried to write the trigger that it sums all the free days with the updated or inserted name with the time conditions in the where clause. But nothing works.
Can anybody help me please?
Thanks Mandy
But I get always ora errors:Firstly, a rant. You don't give us the error numbers, I guess that might make things too easy for us. Look, if I'd wanted to spend my time pulling teeth I'd have gone into dentistry. Help us to help you.
Now I've got that off my chest I'm prepared to take a wild guess. It's ORA-4088, the mutating table bomb. The problem is you are querying the table you are inserting, which causes problems for transactional integrity. When Oracle sums the rows should it include the row that's currently being inserted? What if the next row inserted is also for 'SMITH' - should Oracle go back and recalculate the previous row? These are not simple questions to answer. Processing the SUM() statement leaves the database in an unpredictable statement and that's not allowed. So Oracle hurls ORA-4088 instead.
There are solutions to this problem around. They tend to involve flag setting, packages, even jobs - all gnarly stuff. The reason it's so difficult is because the information you are trying to capture is not normal (i.e. not 3NF). It is entirely derivable:
no_of_days free = allowance - sum(END-BEGIN).
Ah, you say, but what about weekends, etc. Well, the inimitable Connor MacDonald has a solution for calculating Business Days on his website (find it here). I also suggest you take his advice about a table for holding public holidays.
Now you know how to calculate the amount of holiday taken, you can include the calculation as a function in a view over the HOLIDAYS table. This (in my opinion) is a more elegant solution than pfaffing around with flags, triggers and packages.
Cheers, APC
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