Получаването на броя на дните без събота и неделя не е толкова трудно, ще намерите няколко решения за това в SO.
Отчитането на празниците е по-предизвикателно. Едно решение е да използвате SCHEDULER
на Oracle . По подразбиране това се използва за SCHEDULER JOBS
, но не виждам причина да не го използвам за други цели.
Най-големият проблем е великденският ден, вижте тук:Computus. Мисля, че най-ефективният начин е да кодирате датите и да ги поддържате ръчно.
BEGIN
DBMS_SCHEDULER.CREATE_SCHEDULE('New_Year', repeat_interval => 'FREQ=YEARLY;BYDATE=0101');
DBMS_SCHEDULER.CREATE_SCHEDULE('Easter_Sunday', repeat_interval => 'FREQ=YEARLY;BYDATE=20150405, 20160327, 20170416, 20170416, 20180401, 20190421, 20200412', comments => 'Hard coded till 2020');
DBMS_SCHEDULER.CREATE_SCHEDULE('Good_Friday', repeat_interval => 'FREQ=YEARLY;BYDATE=20150405-2D, 20160327-2D, 20170416-2D, 20170416-2D, 20180401-2D, 20190421-2D, 20200412-2D');
DBMS_SCHEDULER.CREATE_SCHEDULE('Easter_Monday', repeat_interval => 'FREQ=YEARLY;BYDATE=20150405+1D, 20160327+1D, 20170416+1D, 20170416+1D, 20180401+1D, 20190421+1D, 20200412+1D');
DBMS_SCHEDULER.CREATE_SCHEDULE('Ascension_Day', repeat_interval => 'FREQ=YEARLY;BYDATE=20150405+39D,20160327+39D,20170416+39D,20170416+39D,20180401+39D,20190421+39D,20200412+39D');
DBMS_SCHEDULER.CREATE_SCHEDULE('Pentecost_Monday', repeat_interval => 'FREQ=YEARLY;BYDATE=20150405+50D,20160327+50D,20170416+50D,20170416+50D,20180401+50D,20190421+50D,20200412+50D');
DBMS_SCHEDULER.CREATE_SCHEDULE('Repentance_and_Prayer', repeat_interval => 'FREQ=DAILY;BYDATE=1122-SPAN:7D;BYDAY=WED',
comments => 'Wednesday before November 23th, Buss- und Bettag');
-- alternative solution:
--DBMS_SCHEDULER.CREATE_SCHEDULE('Repentance_and_Prayer', repeat_interval => 'FREQ=MONTHLY;BYMONTH=NOV;BYDAY=3 WED',
-- comments => '3rd Wednesday in November');
DBMS_SCHEDULER.CREATE_SCHEDULE('Labor_Day', repeat_interval => 'FREQ=YEARLY;BYDATE=0501');
DBMS_SCHEDULER.CREATE_SCHEDULE('German_Unity_Day', repeat_interval => 'FREQ=YEARLY;BYDATE=1003');
DBMS_SCHEDULER.CREATE_SCHEDULE('Christmas', repeat_interval => 'FREQ=YEARLY;BYDATE=1225+SPAN:2D');
DBMS_SCHEDULER.CREATE_SCHEDULE('Christian_Celebration_Days', repeat_interval => 'FREQ=DAILY;INTERSECT=Easter_Sunday,Good_Friday,Easter_Monday,Ascension_Day,Pentecost_Monday,Repentance_and_Prayer,Christmas');
-- alternative solution:
-- DBMS_SCHEDULER.CREATE_SCHEDULE('Christian_Celebration_Days', repeat_interval => 'FREQ=Good_Friday;BYDAY=1 MON, 6 THU,8 MON');
DBMS_SCHEDULER.CREATE_SCHEDULE('Political_Holidays', repeat_interval => 'FREQ=DAILY;INTERSECT=New_Year,Labor_Day,German_Unity_Day');
END;
/
Вижте синтаксиса за календара тук:Синтаксис на календара
След това можете да използвате графиците по следния начин:
CREATE OR REPLACE FUNCTION DateDiff(end_date IN TIMESTAMP) RETURN INTEGER AS
next_run_date TIMESTAMP := TRUNC(SYSTIMESTAMP);
res INTEGER := 0;
BEGIN
IF end_date > SYSTIMESTAMP THEN
LOOP
DBMS_SCHEDULER.EVALUATE_CALENDAR_STRING('FREQ=DAILY;INTERVAL=1;BYDAY=MON,TUE,WED,THU,FRI; EXCLUDE=Christian_Celebration_Days,Political_Holidays', NULL, next_run_date, next_run_date);
EXIT WHEN next_run_date >= end_date;
res := res + 1;
END LOOP;
RETURN res;
ELSE
RAISE VALUE_ERROR;
END IF;
END;
SELECT DateDiff(TO_DATE('04/10/2015','mm/dd/yyyy')) AS Differenz FROM DUAL;
Извеждане на следващите 20 празника за тестване:
DECLARE
next_run_date TIMESTAMP;
BEGIN
FOR i IN 1..20 LOOP
DBMS_SCHEDULER.EVALUATE_CALENDAR_STRING('FREQ=DAILY;INTERSECT='Christian_Celebration_Days,Political_Holidays', NULL, next_run_date, next_run_date);
DBMS_OUTPUT.PUT_LINE(next_run_date);
END LOOP;
END;
Актуализиране
Дори намерих по-компактна версия:
BEGIN
-- Start with first celebration day (good Friday), all dependent celebration days have to be after this day for proper calculation of schedule
DBMS_SCHEDULER.CREATE_SCHEDULE('GOOD_FRIDAY', repeat_interval => 'FREQ=YEARLY;BYDATE=20100402,20110422,20120406,20130329,20140418,20150403,20160325,20170414,20180330,20190419,20200410,20210402,20220410,20230407,20240329,20250418,20260403,20270326,20280414,20290330,20300419', comments => 'Hard coded 2010 to 2030');
-- Easter Sunday can be skipped for list of holidays, otherwise 'FREQ=Good_Friday;BYDAY=1 SUN+SPAN:2D'
DBMS_SCHEDULER.CREATE_SCHEDULE('EASTER_MONDAY', repeat_interval => 'FREQ=Good_Friday;BYDAY=1 MON', comments => '1st Monday after Good Friday'
DBMS_SCHEDULER.CREATE_SCHEDULE('ASCENSION_DAY', repeat_interval => 'FREQ=Good_Friday;BYDAY=6 THU', comments => '6th Thursday after Good Friday (40 days after Easter)');
-- Pentecost Sunday can be skipped for list of holidays, otherwise 'FREQ=Good_Friday;BYDAY=8 SUN+SPAN:2D'
DBMS_SCHEDULER.CREATE_SCHEDULE('PENTECOST_MONDAY', repeat_interval => 'FREQ=Good_Friday;BYDAY=8 MON', comments => '8th Monday after Good Friday (50 days after Easter)');
DBMS_SCHEDULER.CREATE_SCHEDULE('EASTER_RELATED_DAYS', repeat_interval => 'FREQ=Good_Friday;BYDAY=1 MON, 6 THU,8 MON'
END;