mysql - codeigniter - 如何重置填充表上的自动增量？

Question

我正在使用 MySQL。我试过这个:

SET @num := 0; UPDATE rancangan_bulanan SET id = @num := (@num+1);

但是使用 $this->db->query( "SET @num := 0; UPDATE rancangan_bulanan SET id = @num := (@num+1); 没有给出所需的结果结果。

它显示:

Error Number: 1064

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 'UPDATE rancangan_bulanan SET id = @num := (@num+1)' at line 1

SET @num := 0; UPDATE rancangan_bulanan SET id = @num := (@num+1);

Filename: C:/xampp/htdocs/belajar/rkape/system/database/DB_driver.php

Line Number: 691

有人可以帮助我吗？

Answer 1

我认为您错过了ALTER TABLE your_table AUTO_INCRMENT =1;

SET  @num := 0; 

UPDATE rancangan_bulanan SET id = @num := (@num+1); 

ALTER TABLE rancangan_bulanan AUTO_INCREMENT =1;

或者如果你想将计数器重置为1，你可以使用:

ALTER TABLE rancangan_bulanan AUTO_INCREMENT = 1

检查这个答案:How to reset AUTO_INCREMENT in MySQL?

如果您想要重新评估所有行中的 ID，您可以使用:

ALTER TABLE rancangan_bulanan DROP id

ALTER TABLE rancangan_bulanan ADD id INT NOT NULL AUTO_INCREMENT FIRST, ADD PRIMARY KEY (id), AUTO_INCREMENT=1

Take care!!! This will delete all ids and reassing it, if you have external relations, this will break it!

希望对你有帮助!