我们如何创建MySQL存储过程来计算阶乘？
mysql> DELIMITER //
mysql> CREATE PROCEDURE get_factorial(IN N INT)
-> BEGIN
-> SET @@GLOBAL.max_sp_recursion_depth = 255;
-> SET @@session.max_sp_recursion_depth = 255;
->
-> CALL factorial_recursive (N, @factorial);
->
-> SELECT @factorial;
-> END //
mysql> DELIMITER //
mysql> CREATE PROCEDURE factorial_recursive(IN N INT,OUT factorial INT)
-> BEGIN
-> IF N = 1 THEN
-> SET factorial := 1;
-> ELSE
-> CALL factorial_recursive (N-1, factorial);
-> SET factorial := N * factorial;
-> END IF;
-> END //
mysql> DELIMITER ;
mysql> Call get_factorial(10);
+--------------+
| @factorial |
+--------------+
| 3628800 |
+--------------+
1 row in set (0.11 sec)
mysql> Call get_factorial(5);
+-------------+
| @factorial |
+-------------+
| 120 |
+-------------+
1 row in set (0.00 sec)热门推荐
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