Oracel function instance

1  if end if语句的function实例

create or replace function  GET_PUBLICHOLIDAYTIME(fromtime in Date,totime in Date,isAvalible in number)
return number
as
--定义变量
free_day number:=0;
minDate Date;
maxDate Date;
total number:=0;
fromdate Date:=TO_DATE(to_char(fromtime,'yyyy-MM-dd'),'yyyy-MM-dd');
todate Date:=TO_DATE(to_char(totime,'yyyy-MM-dd'),'yyyy-MM-dd');
begin
  if isAvalible = 1  then
    select min(calendar_date),max(calendar_date),count(calendar_date),into minDate,maxdate,total from T_BI_TNT_DATE;
    when calendar_date between fromDate and toDate
    and IS_PUBLIC_HOLIDAY =1;
    if minDate = fromDate then
      total:=total - 1;free_day:= free_day + ((minDate-1-fromtime));
    end if;
    if maxDate = toDate then
      total:=total - 1;free_day:= free_day + ((totime-maxDate));
    end if;
    if minDate = maxDate then
      free_day:= totime-fromtime;
    else
      free_day:=free_day+total;
    end if;
  end if;
  return free_day;
end GET_PUBLICHOLIDAYTIME;