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这段代码中有一些错误，尝试调试但找不到答案。

有人可以纠正我吗？

BEGIN

DECLARE FINALID VARCHAR(8);
DECLARE MAXIDCOMPANY VARCHAR(8);

        SELECT MAX(SUBSTRING(company.idCompany,3,8))+1 INTO MAXIDCOMPANY 
        FROM company 
        WHERE SUBSTRING(company.idCompany,1,2) = SUBSTRING(nmCompany,1,2);


                IF MAXIDCOMPANY > 0 AND MAXIDCOMPANY < 10 THEN
                    SET FINALID = CONCAT(SUBSTRING(nmCompany,1,2),'00', CONVERT(MAXIDCOMPANY USING latin1));
                    ELSEIF MAXIDCOMPANY > 9 AND MAXIDCOMPANY < 100 THEN
                        SET FINALID = CONCAT(SUBSTRING(nmCompany,1,2),'0', CONVERT(MAXIDCOMPANY USING latin1));
                            ELSEIF MAXIDCOMPANY > 99  THEN
                            SET FINALID = CONCAT(SUBSTRING(nmCompany,1,2), CONVERT(MAXIDCOMPANY USING latin1));
                END IF;

                        IF MAXIDCOMPANY IS NULL THEN
                            SET FINALID = CONCAT(SUBSTRING(nmCompany,1,2),'001');
                        END IF;

                INSERT INTO company
                (company.idCompany, company.nmCompany, company.country, company.address, company.region, company.joinDate, company.quota, company.createdUser, company.createdDate, company.updatedUser, company.updatedDate)
                VALUES
                (FINALID, nmCompany, country, address, region, joinDate, quota, createdUser, NOW(), updatedUser, updatedDate);



END

那是代码，程序在接近 1000 之后卡在计数器上。

例子 ：

当我将例如 IN1000 的数据添加为 idCompany 时，它总是停留在那个数字上，但是当我查询最大数据时它只显示 IN999，为什么不是 IN1000

非常感谢

4

1 回答 1

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因为函数 max 与 SUB-STRING 结合会返回变量字符内的最大值，解决方法是用 count 函数替换它，逻辑 count 将返回最大值。

SELECT COUNT(company.idCompany) + 1 INTO MAXIDCOMPANY from company where SUBSTRING(company.idCompany,1,2) = SUBSTRING(company.idCompany,1,2);

根据我的商业散文，谢谢大家的回答..

于 2013-06-27T18:10:43.417 回答