Re: Stored Procedure Question - Mailing list pgsql-novice

Hi Steve,

Thanks for your help... i was trying something in the mean time anyway
and came up with:

===================
CREATE FUNCTION "get_next_birthday" (integer,integer) RETURNS date AS '
DECLARE
        month ALIAS FOR $1;
        day ALIAS FOR $2;
BEGIN
        IF date(\'now\') <= (date(date_part(\'year\', timestamp \'now\') || \'-01-01\') + (month || \'
month\')::interval+ (day || \' day\')::interval - \'1 month 1 day\'::interval) 
        THEN
          RETURN (date(date_part(\'year\', timestamp \'now\') || \'-01-01\') + (month || \' month\')::interval + (day
||\' day\')::interval - \'1 month 1 day\'::interval); 
        ELSE
          RETURN (date(date_part(\'year\', timestamp \'now\') || \'-01-01\') + (month || \' month\')::interval + (day
||\' day\')::interval - \'1 month 1 day\'::interval) + \'1 year\'::interval; 
        END IF;

END;
' LANGUAGE 'plpgsql';
===================

As you can see my version is not the simplest, so i'll use yours as a re-starting point...

thanks again,

simran.


On Fri, 2003-01-17 at 11:54, Steve Crawford wrote:
> Once you have a function there should be no need to do an update on a table.
> Just query using the function whenever you need the next birthday.
>
> Here's a quick hack. It works on my birthday. Birthdays in the future give
> unpredictable results. In other words, play with it as a starting point but
> don't rely on it until proven good ('' is two single quotes not one double
> quote though I think the double-quote version will work as well):
>
> create function nextbday(date) returns date as
> 'select ($1 + (''1 year'' + date_trunc(''year'',age(now(),$1))))::date'
> language sql;
>
> Cheers,
> Steve
>
>
> On Thursday 16 January 2003 3:30 pm, simran wrote:
> > I wanted to create a store procedure (unless there is a easier way) so
> > that i get a person's next birthday date given their birthday.
> >
> > Aka, in one of my queries i am trying to do:
> >
> >
> > psql> update users set next_birthday=get_next_birthday(dob) where
> > user_id='42';
> >
> > except, i don't quite know how to go about creating the
> > get_next_birthday function.
> > 'dob' is a field in users that is of type 'date'.
> >
> > I have tried the following method:
> >
> > psql> update users set next_birthday=dob + (date_part('year', timestamp
> > 'now') - date_part('year', dob))*365.25;
> >
> > Which works wonderfully, except when when i if the date of birth is say
> > '1973-01-10' - in this case, it will put
> > the next_birthday as 2003-01-10 as it always converts the year to the
> > current year, not realising that the date/month
> > have already passed for this year.
> >
> > Any help would be appreciated,
> >
> > kind regards,
> >
> > simran.
> >
> >
> >
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