db2 函数、存储过程示例

1、函数

--drop function getMaxDate;
create FUNCTION getMaxDate (y int, m int )
returns date
begin
     DECLARE maxDate date ;
     select max(dateid ) into maxDate from d_time where years = y and months = m;
     return maxDate;
end;

values getMaxDate(2013 ,3);

2、存储过程

--drop procedure test ; 

CREATE  PROCEDURE TEST
( IN BEGINDATE DATE ,
  IN ENDDATE DATE ,
  OUT NUM int
)
begin
  declare currDate date ; --
  declare cy int ;
  declare cm int ; 

  DECLARE  at_end    INT  DEFAULT  0 ; --
  DECLARE  not_found    CONDITION  FOR  SQLSTATE  '' ; -- 

  declare C1 cursor for
    select dateid , years ,months from d_time where dateid >beginDate and dateid <=endDate + 1  days order by dateid ; --
  DECLARE  CONTINUE  HANDLER  FOR  not_found
    SET  at_end    =  1 ; --
      set num = 0 ;
        open C1 ; --
        fetch  C1 into currDate ,cy ,cm ; -- 

        WHILE  at_end = 0   DO 

          SET at_end =0 ; --
          fetch  C1 into currDate ,cy ,cm ; -- 

              insert into test (dateid ,y , m ) values ( currDate ,cy ,cm ); 

              set num = num + 1 ;

        END  WHILE ;   --
      CLOSE  C1 ;   --
END ; 

call test (date '2014-01-01' ,date '2014-02-23' , ?);