mysql 自增键的上限后异常处理

一般情况下对于自增键  会使用 int ，自增键上限 ：2的32次方 -1（4294967295）

达到自增上限后，数据就无法继续插入，报“ERROR 1062 (23000): Duplicate entry '4294967295' for key 'PRIMARY'” 错误

mysql [localhost:5724] {root} (test) > insert into t values(null);
ERROR 1062 (23000): Duplicate entry '4294967295' for key 'PRIMARY'

mysql [localhost:5724] {root} (test) > show create table t \G
*************************** 1. row ***************************
       Table: t
Create Table: CREATE TABLE `t` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4294967295 DEFAULT CHARSET=latin1
1 row in set (0.07 sec)

解决办法：修改自增键数据类型为：bigint 占8个字节，自增上限 为2的64-1 

mysql [localhost:5724] {root} (test) >  alter table t modify column id bigint unsigned NOT NULL AUTO_INCREMENT;
Query OK, 1 row affected (0.54 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql [localhost:5724] {root} (test) > show create table t \G
*************************** 1. row ***************************
       Table: t
Create Table: CREATE TABLE `t` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4294967296 DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

 
mysql [localhost:5724] {root} (test) > insert into t values(null);
Query OK, 1 row affected (0.06 sec)

mysql [localhost:5724] {root} (test) > show create table t \G
*************************** 1. row ***************************
       Table: t
Create Table: CREATE TABLE `t` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4294967297 DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

标签：AUTO,上限,自增键,5724,INCREMENT,mysql,id,row
来源： https://blog.csdn.net/royjj/article/details/101438195