MySQL 程序不允许我设置变量值

Question

我在处理过程时遇到问题，我在设置声明变量的值时收到错误 1064。

这是代码。

use lab3New;
delimiter $
drop procedure if exists Q4C;
create procedure Q4C()  
BEGIN
    declare bonus decimal(8,2);
    declare count int;
    declare done int;
    declare empSL decimal(8,2);
    declare tmpSL decimal(8,2);
    declare empID int;
    
    set bonus = 100000;
    set count = 0;
    
    declare myCursor cursor for
    select salary, employee_id
    from employees
    order by salary asc;
    
    declare continue handler for not found set done = TRUE;
    open myCursor;
    read_loop:LOOP
        fetch myCursor into empSL, empID;
        if done then leave read_loop; end if;
        set tmpSL = .2 * empSL;
        if tmpSL > bonus then
            update employees
            set salary = salary + bonus
            where employee_id = empID;
            
            set bonus = 0;
            set count = count + 1;
            end loop;
        else 
            set bonus = bonus - tmpSL;
            set salary = salary + tmpSL
            where employee_id = empID;
            set count = count + 1;
        end if;
    end loop;
    close myCursor;
    
    select count;
    
END$
delimiter ;

和table

+----------------+--------------+------+-----+---------+-------+
| Field          | Type         | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+-------+
| employee_id    | decimal(6,0) | NO   | PRI | NULL    |       |
| first_name     | varchar(20)  | YES  |     | NULL    |       |
| last_name      | varchar(25)  | NO   |     | NULL    |       |
| email          | varchar(25)  | NO   | UNI | NULL    |       |
| phone_INT      | varchar(20)  | YES  |     | NULL    |       |
| hire_date      | date         | NO   |     | NULL    |       |
| job_id         | varchar(10)  | NO   |     | NULL    |       |
| salary         | decimal(8,2) | YES  |     | NULL    |       |
| commission_pct | decimal(2,2) | YES  |     | NULL    |       |
| manager_id     | decimal(6,0) | YES  |     | NULL    |       |
| department_id  | decimal(4,0) | YES  |     | NULL    |       |
+----------------+--------------+------+-----+---------+-------+

这是错误

ERROR 1064 (42000) at line 3: 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 myCursor cursor for
    select salary, employee_id
    from employees
    order b' at line 11

有什么想法吗？我尝试使用默认值并设置值，但在我递增 count 的循环中，我在该行收到错误 1064。谢谢。

Answer 1

任何 DECLARE 语句必须放在代码块中任何其他语句之前。而您在 SET 语句之后放置 DECLARE CURSOR（和 DECLARE HANDLER）。

MySQL 8.0 Reference Manual / ... / DECLARE Statement

DECLARE is permitted only inside a BEGIN ... END compound statement and must be at its start, before any other statements.

MySQL 程序不允许我设置变量值

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