troubleshooting Question

mysql function not working correctly

Avatar of John_2357
John_2357 asked on
MySQL ServerSQL
4 Comments1 Solution499 ViewsLast Modified:
The goal is to pass in a date, and then to keep incrementing this date until we find this date existing in a table.

I tired various queries, the first one is:

CREATE function data_exist_date ( dfrom date ) returns DATE
READS SQL DATA
begin
declare d DATE;
declare x INT;
declare f INT;
set d = '1111-11-11';
set x = 1;
set f = 0;

while f = 0 DO

        -- when there is a valid price for GE on this date make f=1, exiting the while loop
    select 1 into f 
        -- when there is a valid price for GE on this date make d = to the 1st date found after the passed in date
    select fk_tdate into d 

    from prices 
    where fk_tdate = ADDDATE(dfrom, INTERVAL x DAY)
        and fk_curr = 'USD'
        and fk_sym = 'GE'
    limit 1;

        -- INC the counter so we keep adding another day to the INTERVAL
    set x = x + 1;

end while;
        -- return the first date found with valid prices after the passed in date.
return d;
//

I got this error (I guess I can not use multiple "select xxx into yyyy' stmts):

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select fk_tdate into d

    from prices
    where fk_tdate = ADDDATE(dfrom, IN' at line 16


The second query is:

delimiter //
CREATE function data_exist_date ( dfrom date ) returns DATE
READS SQL DATA
begin
declare d DATE;
declare x INT;
declare f INT;
set d = '1111-11-11';
set x = 1;
set f = 0;

while f = 0 DO

        -- when there is a valid price for GE on this date make f=1, exiting the while loop
    select 1 into f 
    from prices 
    where fk_tdate = ADDDATE(dfrom, INTERVAL x DAY)
        and fk_curr = 'USD'
        and fk_sym = 'GE'
    limit 1;
        
        -- when there is a valid price for GE on this date make d = to the 1st date found after the passed in date
    select fk_tdate into d 
    from prices 
    where fk_tdate = ADDDATE(dfrom, INTERVAL x DAY)
        and fk_curr = 'USD'
        and fk_sym = 'GE'
    limit 1;

        -- INC the counter so we keep adding another day to the INTERVAL
    set x = x + 1;

end while;
        -- return the first date found with valid prices after the passed in date.
return d;
//

I get this error:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 33

So, what is the correct syntax? All I am trying to do is to accept a date then increment it one date, test a table to see if this incremented date exist and if not to increment again until we find the date which exist in the table, and then return that date.

Thank you in advance
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