Message-ID: <006101c3d51b$43390730$7502a8c0@hdsc.com>
Reply-To: "Kumar" <sgnerd@yahoo.com.sg>
From: "Kumar" <sgnerd@yahoo.com.sg>
To: "Chris Travers" <chris@travelamericas.com>, <josh@agliodbs.com>,
	"Peter Eisentraut" <peter_e@gmx.net>, "psql" <pgsql-sql@postgresql.org>
References: <00a501c3d41b$2dc9a0e0$7502a8c0@hdsc.com>
	<200401061956.57063.peter_e@gmx.net>
	<200401061413.12096.josh@agliodbs.com>
	<001701c3d4e4$62fc4dc0$7502a8c0@hdsc.com>
	<014301c3d4f2$ce2bffb0$9100053d@winxp>
Subject: Re: Calendar Scripts - Quite a complex one
Date: Wed, 7 Jan 2004 18:09:07 +0530
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Hi,
yes yes. U understood in a very correct way, as i have 2 tables -
appointments and recurrences. And we are not gonna use PHP.

For future dates, I am not gonna populate, instead I am gonna check for the
recurrences tables for ever appointments and based on the conditions, I am
gonna say how many time that appointment recure in that month and the
timestamp.

To process that I have get all the appointment data and its recurrence
pattern data into the cursor. Is there a way to get the records one by one
from the cursor and calculate it patterns.

CREATE OR REPLACE FUNCTION crm.fn_calendar_daily_activities(timestamp)
  RETURNS refcursor AS
'DECLARE
 cal_daily_date ALIAS FOR $1;
 ref  REFCURSOR;

BEGIN
     OPEN ref FOR
     SELECT ....................

     RETURN ref;

    END;'
    LANGUAGE 'plpgsql' VOLATILE;

How to open the cursor here so that I could check its  recurrences pattern.

Please shed some light.

Regards
kumar

----- Original Message ----- 
From: "Chris Travers" <chris@travelamericas.com>
To: "Kumar" <sgnerd@yahoo.com.sg>; <josh@agliodbs.com>; "Peter Eisentraut"
<peter_e@gmx.net>; "psql" <pgsql-sql@postgresql.org>
Sent: Wednesday, January 07, 2004 1:19 PM
Subject: Re: [SQL] Calendar Scripts - Quite a complex one


> Hi all;
>
> If I understand Kumar's post correctly, he is having some question
relating
> to the issue of even recurrance.  I would highly suggest reading the
> ICalendar RFC (RFC 2445) as it has some interesting ideas on the subject.
> HERMES (my app with appointment/calendar functionality) doesn't yet
support
> appointment recurrance, and I have not formalized my approach to this.
> However, here is the general approach I have been looking at:
>
> 1: Have a separate table of recurrance rules (1:1 with appointments) or
have
> a recurrance datatype.
>
> 2: Build some functions to calculate dates and times when the appointment
> would recurr.  You can also have a "Recur Until" field so you can limit
your
> searches this way.
>
> 3:  Use a view to find recurring appointments on any given day.
>
> This avoids a very nasty problem in the prepopulation approach-- that of a
> cancelled recurring meeting.  How do you cancel ALL appropriate instances
of
> the meeting while leaving those that occured in the past available for
> records?
>
> Kumar-- if you are working with PHP, I would be happy to work with you in
> this endevor so that the same functionality can exist in my open source
> (GPL'd) application.  I think that the source for this would likely be one
> of those things that might be best LGPL'd if added to my app.
>
> Best Wishes,
> Chris Travers
>
> ----- Original Message -----
> From: "Kumar" <sgnerd@yahoo.com.sg>
> To: <josh@agliodbs.com>; "Peter Eisentraut" <peter_e@gmx.net>; "psql"
> <pgsql-sql@postgresql.org>
> Sent: Wednesday, January 07, 2004 1:06 PM
> Subject: Re: [SQL] Calendar Scripts - Quite a complex one
>
>
> > Hi,
> >
> > The complexity comes while scheduling the appointments. Let us say, I
have
> > scheduled so many meetings in my calendar of various schedules like
daily,
> 3
> > days once, weekly, bi weekly. monthly, bi monthly, etc.
> >
> > While I open the calendar for end of this year (say Dec 2004), I need to
> > show those meetings in my calendar, but I have data until Jan 2004.
> >
> > What is the best way to show it. Populating the records from Jan 2004 to
> Dec
> > 2004 in the pgsql function and display it in the calendar, or just write
a
> > query to generate temporary records only for that Dec 2004 and not
storing
> > them at the database.
> >
> > Please shed some idea.
> >
> > Regards
> > Kumar
> >
> > ----- Original Message -----
> > From: "Josh Berkus" <josh@agliodbs.com>
> > To: "Peter Eisentraut" <peter_e@gmx.net>; "Kumar" <sgnerd@yahoo.com.sg>;
> > "psql" <pgsql-sql@postgresql.org>
> > Sent: Wednesday, January 07, 2004 3:43 AM
> > Subject: Re: [SQL] Calendar Scripts - Quite a complex one
> >
> >
> > Peter,
> >
> > > You can probably lift out the complete calendar functionality from an
> > > existing groupware solution, say, www.egroupware.org.  I'm not sure
> > > whether it's practical to do the calendar things in the database,
since
> > > you will also need a significant amount of intelligence in the client
> > > to display reasonable calendar graphics, for instance.
> >
> > But all of the appointments, holidays, etc can and should be stored in
the
> > database, and by using function programming one can automate generating
> all
> > of the raw data for the calendar graphics.   We do this with our legal
> > calendaring app.
> >
> > --
> > -Josh Berkus
> >  Aglio Database Solutions
> >  San Francisco
> >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
> >
> >