ERROR 1062 (23000): Duplicate entry '0' for key 'PRIMARY'
1) 운영 체제
cat/etc/issue CentOS release 6.6 (Final) Kernel\r on an\m
cat/proc/version Linux version 2.6.32-504.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) #1 SMP Wed Oct 15 04: 27:16 UTC 2014 2) mysql 데이터베이스 버전
R&D 테스트 환경 5.1.73
비즈니스 환경 5.6.26
2. 질문
연구 개발한 형제가 오늘 와서 나에게 5.1.73의 테스트 환경에서 아래의 문장을 반복해서 집행할 수 있다고 반영하였다
###여기서 meclassid열은 자증열입니다
그러나 상업적 환경(5.6.26)에서 실행할 때 두 번째 실행하면 다음과 같은 오류를 보고한다(솔직히 말하면 나는 이런 쓰기 방법을 처음 본다. 일반적으로 auto increment열을 지정하지 않거나null값으로 지정한다)
ERROR 1062 (23000): Duplicate entry '0' for key 'PRIMARY'
t_meclass 테이블은 다음과 같이 정의됩니다.
CREATE TABLE `t_meclass` (
`meclass_id` bigint(20) not NULL AUTO_INCREMENT COMMENT ' ',
`meclass_name` varchar(100) DEFAULT NULL COMMENT ' ',
`meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ',
`property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ',
`create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ',
`last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ',
`state` bigint(20) NOT NULL DEFAULT '0',
`type` bigint(20) NOT NULL DEFAULT '0',
PRIMARY KEY (`meclass_id`)
) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; 5.6.26에서 다음을 반복합니다.
mysql> insert into t_meclass set meclass_id = default ,meclass_name='XXXX APP( 1100)',meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0;
Query OK, 1 row affected (0.01 sec)
mysql> select * from t_meclass;
+------------+----------------------------+--------------+----------+-------------+------------------+-------+-------+
| meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type |
+------------+----------------------------+--------------+----------+-------------+------------------+-------+-------+
| 0 | XXXX APP( 1100) | | 53453792 | 1446625414 | 1446625414 | 0 | 20000 |
+------------+----------------------------+--------------+----------+-------------+------------------+-------+-------+
1 row in set (0.00 sec)
mysql> insert into t_meclass set meclass_id = default ,meclass_name='XXXX APP( 1100)',meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0;
ERROR 1062 (23000): Duplicate entry '0' for key 'PRIMARY'
mysql> 3. 솔루션
mysql(5.6.26) 공식 문서에서 autoincrement 섹션에서 다음 문제와 관련된 부분을 캡처합니다.
NO_AUTO_VALUE_ON_ZERO
NO_AUTO_VALUE_ON_ZERO affects handling of AUTO_INCREMENT columns. Normally, you generate the next sequence number for the column by inserting either NULL or 0 into it. NO_AUTO_VALUE_ON_ZERO suppresses this behavior for 0 so that only NULL generates the next sequence number.<pre name="code" class="html"><span style="color:#ff6666;">>>NO_AUTO_VALUE_ON_ZERO AUTO_INCREMENT 。 null 0 ， 。 sql_mode NO_AUTO_VALUE_ON_ZERO， 0 ， 0， null 。</span>##通过上面官方文档描述可以，在sql_mode中去掉NO_AUTO_VALUE_NO_ZERO应该就没有问题了，后来再商用环境上，调整sql_mode后问题解决(其实最根本的解决方法，还是需要研发修改他们的代码)
好了看完了官方文档 再来看看我们研发遇到的问题：
1)查看重复执行报错的 5.6.26数据库的sql_mode
mysql> show variables like 'sql_mode'; +---------------+--------------------------------------------------------------------------------------+ | Variable_name | Value | +---------------+--------------------------------------------------------------------------------------+ | sql_mode | NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | +---------------+--------------------------------------------------------------------------------------+
2) 우리는 sql 을 보았다mode에 NO 이 포함되어 있음AUTO_VALUE_ON_ZERO, 이것은 auto로 간주됨increment 열이 0 값을 만났을 때 자동 증가 시퀀스 값이 생성되지 않고 0 값이 삽입됩니다
3) 그 문제는 우리가default값을 삽입했는데 어떻게 0값이 되었는가?이 문제에 관하여 나는 다음과 같은 실험을 했다.
1.sql_mode='NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION 때mysql> show variables like 'sql_mode'; +---------------+--------------------------------------------------------------------------------------+ | Variable_name | Value | +---------------+--------------------------------------------------------------------------------------+ | sql_mode | NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | +---------------+--------------------------------------------------------------------------------------+ 1 row in set (0.01 sec) mysql> drop table test3; Query OK, 0 rows affected (0.01 sec) mysql> CREATE TABLE `test3` ( -> `meclass_id` bigint(20) not NULL COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0', -> PRIMARY KEY (`meclass_id`) -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.00 sec) mysql> insert into test3 set meclass_id = default ,meclass_name=default ,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; ERROR 1364 (HY000): Field 'meclass_id' doesn't have a default value <span style="color:#ff0000;">>> sql_mode STRICT_TRANS_TABLES ， not null， default， </span> mysql> drop table test3; Query OK, 0 rows affected (0.00 sec) mysql> CREATE TABLE `test3` ( -> `meclass_id` bigint(20) COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0', -> PRIMARY KEY (`meclass_id`) -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.05 sec) mysql> insert into test3 set meclass_id = default ,meclass_name=default ,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected (0.00 sec) <span style="color:#ff0000;">>> sql_mode STRICT_TRANS_TABLES ， not null ， default， ，meclass_id( ) 0，meclass_name null</span> mysql> select * from test3; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | 0 | NULL | | 53453792 | 1446630357 | 1446630357 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec) mysql> drop table test3; Query OK, 0 rows affected (0.07 sec) mysql> CREATE TABLE `test3` ( -> `meclass_id` bigint(20) COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0' -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.00 sec) mysql> insert into test3 set meclass_id = default ,meclass_name=default ,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected (0.03 sec) <span style="color: rgb(255, 0, 0); font-family: Arial, Helvetica, sans-serif;">>> sql_mode STRICT_TRANS_TABLES ， not null ， default， ，meclass_id( ) null，meclass_name null.( meclass_id )</span> mysql> select * from test3; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | NULL | NULL | | 53453792 | 1446630887 | 1446630887 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec) mysql> drop table test3; Query OK, 0 rows affected (0.01 sec) mysql> CREATE TABLE `test3` ( -> `meclass_id` bigint(20) not NULL AUTO_INCREMENT COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0', -> PRIMARY KEY (`meclass_id`) -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.02 sec) mysql> insert into test3 set meclass_id = default ,meclass_name=default ,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected (0.01 sec) <span style="color: rgb(255, 0, 0); font-family: Arial, Helvetica, sans-serif;">>> sql_mode STRICT_TRANS_TABLES ， not null ， AUTO_INCREMENT， default， ，meclass_id( ) null，meclass_name null.( meclass_id auto_increment not null ， default )</span> mysql> select * from test3; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | 0 | NULL | | 53453792 | 1446631037 | 1446631037 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec) mysql> insert into test3 set meclass_id = default ,meclass_name=default ,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; ERROR 1062 (23000): Duplicate entry '0' for key 'PRIMARY' <span style="color:#ff0000;">>> 0， </span> mysql>
sqlmode=이 비어 있을 때 다음 테스트를 수행합니다.mysql> show variables like 'sql_mode'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | sql_mode | | <span style="color:#ff0000;">>>sql_mode </span> +---------------+-------+ 1 row in set (0.00 sec) mysql> drop table test5; Query OK, 0 rows affected (0.01 sec) mysql> CREATE TABLE `test5` ( -> `meclass_id` bigint(20) not null COMMENT ' ', -> `meclass_name` varchar(100) not NULL COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0', -> PRIMARY KEY (`meclass_id`) -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.00 sec) mysql> insert into test5 set meclass_id = default ,meclass_name=default,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected, 2 warnings (0.00 sec) <span style="color:#ff0000;">>> sql_mode ， not null， default， default warning， meclass_id 0，meclass_name </span> mysql> show warnings; +---------+------+---------------------------------------------------+ | Level | Code | Message | +---------+------+---------------------------------------------------+ | Warning | 1364 | Field 'meclass_id' doesn't have a default value | | Warning | 1364 | Field 'meclass_name' doesn't have a default value | +---------+------+---------------------------------------------------+ 2 rows in set (0.00 sec) mysql> select * from test5; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | 0 | | | 53453792 | 1446633043 | 1446633043 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec) mysql> CREATE TABLE `test5` ( -> `meclass_id` bigint(20) COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0' -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.06 sec) mysql> insert into test5 set meclass_id = default ,meclass_name=default,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected (0.00 sec) <span style="color:#ff0000;">>>sql_mode ， not null ， default ， default， ， meclass_id null，meclass_name null( ， not null， meclass_name )## not null null</span> mysql> mysql> select * from test5; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | NULL | NULL | | 53453792 | 1446633290 | 1446633290 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec) mysql> drop table test5; Query OK, 0 rows affected (0.00 sec) mysql> CREATE TABLE `test5` ( -> `meclass_id` bigint(20) not NULL AUTO_INCREMENT COMMENT ' ', -> `meclass_name` varchar(100) COMMENT ' ', -> `meclass_desc` varchar(255) DEFAULT NULL COMMENT ' ', -> `property` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `create_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `last_update_time` bigint(20) NOT NULL DEFAULT '0' COMMENT ' ', -> `state` bigint(20) NOT NULL DEFAULT '0', -> `type` bigint(20) NOT NULL DEFAULT '0', -> PRIMARY KEY (`meclass_id`) -> ) ENGINE=InnoDB AUTO_INCREMENT=303903 DEFAULT CHARSET=utf8 COMMENT=' '; Query OK, 0 rows affected (0.05 sec) mysql> insert into test5 set meclass_id = default ,meclass_name=default,meclass_desc='',property=53453792,type=20000,create_time= unix_timestamp(now()),last_update_time=unix_timestamp(now()),state=0; Query OK, 1 row affected (0.00 sec) <span style="color:#ff0000;">>>sql_mode 0 ， not null auto_increment， default， ，meclass_id auto_increment ，meclass_name null</span> mysql> mysql> select * from test5; +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | meclass_id | meclass_name | meclass_desc | property | create_time | last_update_time | state | type | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ | 303903 | NULL | | 53453792 | 1446633360 | 1446633360 | 0 | 20000 | +------------+--------------+--------------+----------+-------------+------------------+-------+-------+ 1 row in set (0.00 sec)
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