mysql存儲過程中的嵌套循環

Question

我在存儲過程中有一個簡單的嵌套while循環，但它給出了一個錯誤。 循環沒有什麼了不起，只是爲了學習目的我創建了兩個循環。

delimiter $$ 
create procedure getSum(in input int , out output int) 
begin 

set output = 0; 
while input >= 1 do 

    declare tmp int default 1; 
    while tmp <= 5 do 
     set output = output + input ; 
     set tmp = tmp + 1; 
    end while ; 

set input = input - 1 ; 

end while; 

end $$ 
delimiter ; 

下面是錯誤

#1064 - 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 'declare tmp int default 1; while tmp <= 5 do set output = output + inpu' at line 7

感謝。

Answer 1

試試這個：

delimiter $$ 
create procedure getSum(in input int , out output int) 
begin 
declare tmp int default 1; 
set output = 0; 
while input >= 1 do 

    set tmp = 1; 
    while tmp <= 5 do 
     set output = output + input ; 
     set tmp = tmp + 1; 
    end while ; 

set input = input - 1 ; 

end while; 

end $$ 
delimiter ;