Question

我有一种情况，如果帐号长度小于11，我需要更新帐号，所以如果不满足，需要用0填充。因此，如果数字是123456，则需要在db中将其更新为00000123456

我为此创建了一个存储过程，并且工作正常，

我需要知道有没有更好的方法来做到这一点？

这是我的SP

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_Update_AccountNumber`()
BEGIN
Drop TABLE IF EXISTS temp_table;
CREATE TEMPORARY TABLE IF NOT EXISTS temp_table (id INT(11),accountnumber varchar(50),
                                                            length int,PRIMARY KEY (`id`));

Insert into temp_table(id,accountnumber, length)
select a.id,a.account_number,length(a.account_number) from accounts a
inner join programs p on a.program_id = p.id
where p.abbreviation = 'UA'
and length(a.account_number) < 11;

set @count = (Select count(*) from temp_table);
While @count > 0 Do 
    set @id = (Select id from temp_table limit 0,1);        
    set @accountnumber = (Select accountnumber from temp_table limit 0,1);        
    set @length = (Select length from temp_table limit 0,1);
    set @newlength = 11 - @length;
    Delete from temp_table where id = @id;

    While @newlength > 0 Do 
        set @accountnumber = concat("0" , @accountnumber);
        set @newlength = @newlength - 1;
    End While;
    Update accounts set account_number = @accountnumber where id = @id;
    set @count = (Select count(*) from temp_table);
End While;
END

由于

Answer 1

在您的数据库中使用zerofill。当您插入123时，它将生成00000000123。

此处也说明了这一点：http://dev.mysql.com/doc/refman/5.0/en/numeric-type-overview.html

Answer 2

试试这个

UPDATE accounts
SET account_number = CONCAT(REPEAT('0', 11-LENGTH(account_number)), CONVERT(account_number, CHAR(100)))
WHERE LENGTH(a.account_number) < 11;

Mysql用0＆更新帐号

2 个答案: