MySQL：插入日志中的列为空

Question

我在mysql中有这个存储过程：

DELIMITER $$
CREATE PROCEDURE createCompany ()
BEGIN
    DECLARE finished INTEGER DEFAULT 0;
    DECLARE company varchar(5000) DEFAULT "";

    DEClARE cur CURSOR FOR SELECT company FROM companies; 
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1

    OPEN cur;

    getCompany: LOOP
        FETCH cur INTO company;
        IF finished = 1 THEN 
            LEAVE getCompany;
        END IF;

        call LOG(company);
    END LOOP getCompany;
    CLOSE cur;
END$$
DELIMITER ;

LOG程序是：

DELIMITER $$
CREATE PROCEDURE `LOG`(IN message varchar(5000))
BEGIN
    insert into tmplog (log) values (message);
END$$
DELIMITER ;

我有一个名为 tmplog 的临时表，其中包含两个字段：日期和日志 (varchar(5000))

当我调用 createCompany 时，我得到下一个结果：

日志栏是空的...怎么了？

Answer 1

变量与列同名是非常危险的。试试这个：

BEGIN
    DECLARE v_finished INTEGER DEFAULT 0;
    DECLARE v_company varchar(5000) DEFAULT "";

    DEClARE cur CURSOR FOR SELECT c.company FROM companies c; 
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_finished = 1

    OPEN cur;

    getCompany: LOOP
        FETCH cur INTO v_company;
        IF v_finished = 1 THEN 
            LEAVE getCompany;
        END IF;

        call LOG(v_company);
    END LOOP getCompany;
    CLOSE cur;
END$$
DELIMITER ;