How to generate dates sequentially through functions

Question

first let see the sample code
create or replace function FNC_GET_DATE(p_businessdate varchar2) return date
as
v_date date;
begin
v_Date := to_date(p_businessdate,'mm/dd/yyyy') +10;
return v_date;
end;Now i want to run this function in a loop say for N times and the first output of the function must be the input for the second call
Assuming the Initial value of p_businessdate to be 01/01/2012 the output of the function shall be 01/11/2012.
Now the output 01/11/2012 must be sent as input to the function FNC_GET_DATE then the output shall be 01/21/2012.
Now the output 01/21/2012 must be sent as input to the function FNC_GET_DATE then the output shall be 01/31/2012.
Assuming the number of iterations to be 4( here the value of N )output should be something like this:
01/01/2012
01/11/2012
01/21/2012
01/31/2012For this we need a function which has p_busdate and no_of_itereations as input parameter and the retrun type can be a sysrefcursor as shown below once again:
01/01/2012
01/11/2012
01/21/2012
01/31/2012
Please advise.

Answer 1

sri wrote:
first let see the sample code
create or replace function FNC_GET_DATE(p_businessdate varchar2) return date
as
v_date date;
begin
v_Date := to_date(p_businessdate,'mm/dd/yyyy') +10;
return v_date;
end;Now i want to run this function in a loop say for N times and the first output of the function must be the input for the second call
Assuming the Initial value of p_businessdate to be 01/01/2012 the output of the function shall be 01/11/2012.
Now the output 01/11/2012 must be sent as input to the function FNC_GET_DATE then the output shall be 01/21/2012.
Now the output 01/21/2012 must be sent as input to the function FNC_GET_DATE then the output shall be 01/31/2012.
Assuming the number of iterations to be 4( here the value of N )output should be something like this:
01/01/2012
01/11/2012
01/21/2012
01/31/2012For this we need a function which has p_busdate and no_of_itereations as input parameter and the retrun type can be a sysrefcursor as shown below once again:
01/01/2012
01/11/2012
01/21/2012
01/31/2012
Please advise.Would probably be a lot easier to just use a SQL query.
Here i've assumed you already have a date data type to work with.
ME_TUBBZ?variable num_iterations number;
ME_TUBBZ?exec :num_iterations := 2;
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
ME_TUBBZ?
ME_TUBBZ?with first_date as
  2  (
  3     select trunc(sysdate) as the_date
  4     from dual
  5  )
  6  select the_date + (level * 10)
  7  from first_date
  8  connect by level <= :num_iterations;
THE_DATE+(LEVEL*10)
08-JUL-2012 00 00:00
18-JUL-2012 00 00:00
2 rows selected.
Elapsed: 00:00:00.00
ME_TUBBZ?
ME_TUBBZ?exec :num_iterations := 4;
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
ME_TUBBZ?
ME_TUBBZ?with first_date as
  2  (
  3     select trunc(sysdate) as the_date
  4     from dual
  5  )
  6  select the_date + (level * 10)
  7  from first_date
  8  connect by level <= :num_iterations;
THE_DATE+(LEVEL*10)
08-JUL-2012 00 00:00
18-JUL-2012 00 00:00
28-JUL-2012 00 00:00
07-AUG-2012 00 00:00
4 rows selected.
Elapsed: 00:00:00.00Cheers,