如何从 MySQL 查询生成一系列连续数字(每行一个),以便将它们插入表中?
How do I generate a range of consecutive numbers (one per line) from a MySQL query so that I can insert them into a table?
例如:
nr
1
2
3
4
5
为此我只想使用 MySQL(而不是 PHP 或其他语言).
I would like to use only MySQL for this (not PHP or other languages).
如果您需要表中的记录,并且想要避免并发问题,请按以下步骤操作.
If you need the records in a table and you want to avoid concurrency issues, here's how to do it.
首先你创建一个表来存储你的记录
First you create a table in which to store your records
CREATE TABLE `incr` (
`Id` int(11) NOT NULL auto_increment,
PRIMARY KEY (`Id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
第二次创建一个这样的存储过程:
Secondly create a stored procedure like this:
DELIMITER ;;
CREATE PROCEDURE dowhile()
BEGIN
DECLARE v1 INT DEFAULT 5;
WHILE v1 > 0 DO
INSERT incr VALUES (NULL);
SET v1 = v1 - 1;
END WHILE;
END;;
DELIMITER ;
最后调用 SP:
CALL dowhile();
SELECT * FROM incr;
结果
Id
1
2
3
4
5
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