Question

我想使用此程序选择我想要的任何随机值

delimiter $$
CREATE PROCEDURE randomdigit(troy INT)
     BEGIN
          select troy; 
     END$$
delimiter ;

要使用它，我打电话给call randomdigit(n);

但是，当我尝试将程序分配给触发器中的变量时，我会收到此错误

/ * SQL错误（1064）：您的SQL语法有错误;检查手册，对应右边的MySQL服务器版本在'call randomdigit（1）附近使用的语法; SET the_class_id =（从第11行的e'中选择exam_class_id * /

这是我的触发器

DELIMITER //
CREATE TRIGGER lestrigger
    AFTER INSERT ON examinations
   FOR EACH ROW
  BEGIN
    DECLARE the_last_inserted_id INT ;
    DECLARE the_class_id INT;
    DECLARE the_year_id INT;
    DECLARE lesrandom INT;

    SET the_last_inserted_id = LAST_INSERT_ID();
    SET lesrandom = call randomdigit(1);
    SET the_class_id = (select examination_class_id from examinations where examination_id = 1);
    SET the_year_id = (select examination_class_id from examinations where examination_id = 1);

insert into examination_data (ed_cs_id,ed_examination_id) VALUES (( select cs_id from class_students where cs_class_id = 1 AND cs_year_id = 1 ),lesrandom);

END //
DELIMITER ;

以这种方式将过程分配给变量是否正确？。

Answer 1

Akhil的答案是一个可能的解决方案。如果您需要存储过程，则必须使用OUT参数。

delimiter $$
CREATE PROCEDURE randomdigit(IN troy INT, OUT result INT)
     BEGIN
          set result = troy; 
     END$$
delimiter ;

并将其称为：

DELIMITER //
CREATE TRIGGER lestrigger
    AFTER INSERT ON examinations
   FOR EACH ROW
  BEGIN
    DECLARE the_last_inserted_id INT ;
    DECLARE the_class_id INT;
    DECLARE the_year_id INT;
    DECLARE lesrandom INT;

    SET the_last_inserted_id = LAST_INSERT_ID();
    call randomdigit(1, lesrandom);
    SET the_class_id = (select examination_class_id from examinations where examination_id = 1);
    SET the_year_id = (select examination_class_id from examinations where examination_id = 1);

insert into examination_data (ed_cs_id,ed_examination_id) VALUES (( select cs_id from class_students where cs_class_id = 1 AND cs_year_id = 1 ),lesrandom);

END //
DELIMITER ;

Answer 2

将其更改为功能

delimiter $$
CREATE function randomdigit(troy INT) returns int
     BEGIN
          return troy; 
     END$$
delimiter ;

按如下方式更改触发器

DELIMITER //
CREATE TRIGGER lestrigger
    AFTER INSERT ON examinations
   FOR EACH ROW
  BEGIN
    DECLARE the_last_inserted_id INT ;
    DECLARE the_class_id INT;
    DECLARE the_year_id INT;
    DECLARE lesrandom INT;

    SET the_last_inserted_id = LAST_INSERT_ID();
    SET lesrandom = randomdigit(1);
    SET the_class_id = (select examination_class_id from examinations where examination_id = 1);
    SET the_year_id = (select examination_class_id from examinations where examination_id = 1);

insert into examination_data (ed_cs_id,ed_examination_id) VALUES (( select cs_id from class_students where cs_class_id = 1 AND cs_year_id = 1 ),lesrandom);

END //
DELIMITER ;

希望这很好

将过程分配给变量

2 个答案: