How to set the maxrecursion option for a CTE inside a Table-Valued-Function

Question

I\'m facing a problem declaring the maxrecursion option for a CTE inside a TVF.

Here is the CTE (a simple calendar):

DECLARE @DEBUT DATE = \'1/1/11\'         


        

Answer 1

create simple sample for you :)

/* block create function for test in sql*/
/*FUNCTION [fn_CTE_withLevel] (@max_level int)
RETURNS TABLE
  AS
 RETURN  
       ( */


 /*******************   declare table just replace real table   *****/
declare @tbl table(pid varchar(15),id varchar(15))

/* use function argument */
declare @max_level int = 3

Insert Into @tbl(pid , id)
   values 

     /*lev1*/   ('0','1') ,
         /*lev2*/   ('1','101') ,
         /*lev2*/   ('1','102') ,
     /*lev1*/   ('0','2') ,
         /*lev2*/   ('2','201') ,
                 /*lev3*/   ('201','20101') ,
                 /*lev3*/   ('201','20102') ,
         /*lev2*/   ('2','202') ,
     /*lev1*/   ('0','3') ,
         /*lev2*/   ('3','301') ,
         /*lev2*/   ('3','302') ,
     /*lev1*/   ('0','4') ,
        /*lev2*/    ('4','401'),
        /*lev2*/    ('4','402');

 /*******************   declare table just replace real table   *****/

  With cte_result(pid , id , lev)
        As(
            Select pid , id , 1 as lev From @tbl t
              Where pid = '0'  /* change to another values from list to test sub items */

              Union All

            Select t.pid , t.id , cte.lev + 1 as lev
                 From  cte_result cte
                        inner Join  @tbl t
                  On  cte.id = t.pid 
                   Where cte.lev < @max_level  -- :) this is my idea
          )

         Select * From cte_result 
             --OPTION (MAXRECURSION 100)

  -- uncomment for create function
 /*)*/