问mysql中自定义函数递归调用自己报10061错误如何解决？

一个丛oracle转写成mysql的自定义函数，在函数中根据条件递归调用本身的函数，运行造成10061错误，请大神指教！

create function f_get (p_id_1 varchar(50),rs_entrp_id varchar(50)) returns decimal

begin

declare ll_value decimal default 0;

declare invtor_id_now varchar(50) default '';

declare inv_per_now decimal(6,3) default 0;

DECLARE flag INT DEFAULT 0;

declare cur_inv cursor for

select a.invtor_id, sum(a.inv_per) inv_per

from ims_entrp_invest a

where a.entrp_id= p_id_1 and a.invtor_type='1'

group by a.invtor_id

order by a.invtor_id asc;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET flag = 1;

open cur_inv;

WHILE flag != 1 DO

fetch cur_inv into invtor_id_now,inv_per_now;

IF flag != 1 THEN

if invtor_id_now = rs_entrp_id then

set ll_value = ll_value + inv_per_now / 100;

else

set ll_value = ll_value + (inv_per_now / 100) * f_get(invtor_id_now,rs_entrp_id);

end if;

END IF;

END WHILE;

CLOSE cur_inv;

return ll_value;

end;