MySQL[Err]1055

  • 上次MySQL5.7.19主从建立完成之后,所有的测试都是在MySQL命令行下进行的,最近用Navicat Premium进行MySQL的连接,然后在插入数据的时候MySQL突然报错了,可是我的数据插入成功了,感觉很奇怪!!

    报错内容如下:
[SQL]INSERT INTO biao(ziduan2) VALUES(8888888);
受影响的行: 1
时间: 0.012s [Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
  • 在知乎上找到了一个答案,貌似可以解决问题
在my.cnf 里面设置sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'在sql_mode 中去掉only_full_group_by 解决问题!

PS:可是依然不知道sql_mode是什么?

这里我们先看一下MySQL5.6和MySQL5.7默认的sql模式

# MySQL 5.6 Default SQL_MODE;
mysql> select @@sql_mode;
+--------------------------------------------+
| @@sql_mode |
+--------------------------------------------+
| STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
+--------------------------------------------+
1 row in set (0.00 sec) # MySQL 5.7 Default SQL_MODE;
mysql> select @@sql_mode;
+-------------------------------------------------------------------------------------------------------------------------------------------+
| @@sql_mode |
+-------------------------------------------------------------------------------------------------------------------------------------------+
| ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
+-------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql的sql_mode合理设置

  • mysql的sql_mode合理设置

sql_mode是个很容易被忽视的变量,默认值是空值,在这种设置下是可以允许一些非法操作的,比如允许一些非法数据的插入。在生产环境必须将这个值设置为严格模式,所以开发、测试环境的数据库也必须要设置,这样在开发测试阶段就可以发现问题

sql_mode常用值如下:

  • ONLY_FULL_GROUP_BY

对于GROUP BY聚合操作,如果在SELECT中的列,没有在GROUP BY中出现,那么这个SQL是不合法的,因为列不在GROUP BY从句中。

在严格模式下,不要让GROUP BY部分中的查询指向未选择的列,否则报错。

  • NO_AUTO_VALUE_ON_ZERO

该值影响自增长列的插入。默认设置下,插入0或NULL代表生成下一个自增长值。如果用户 希望插入的值为0,而该列又是自增长的,那么这个选项就有用了。

  • STRICT_TRANS_TABLES

在该模式下,如果一个值不能插入到一个事务表中,则中断当前的操作,对非事务表不做限制

  • NO_ZERO_IN_DATE

在严格模式下,不允许日期和月份为零

  • NO_ZERO_DATE

设置该值,mysql数据库不允许插入零日期,插入零日期会抛出错误而不是警告。

  • ERROR_FOR_DIVISION_BY_ZERO

在INSERT或UPDATE过程中,如果数据被零除,则产生错误而非警告。如 果未给出该模式,那么数据被零除时MySQL返回NULL

  • NO_AUTO_CREATE_USER

禁止GRANT创建密码为空的用户

  • NO_ENGINE_SUBSTITUTION

如果需要的存储引擎被禁用或未编译,那么抛出错误。不设置此值时,用默认的存储引擎替代,并抛出一个异常

  • PIPES_AS_CONCAT

将"||"视为字符串的连接操作符而非或运算符,这和Oracle数据库是一样的,也和字符串的拼接函数Concat相类似

  • ANSI_QUOTES

启用ANSI_QUOTES后,不能用双引号来引用字符串,因为它被解释为识别符

ORACLE的sql_mode设置等同:PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS, NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, NO_AUTO_CREATE_USER.

如果使用mysql,为了继续保留大家使用oracle的习惯,可以对mysql的sql_mode设置如下:

在my.cnf添加如下配置
[mysqld]
sql_mode='ONLY_FULL_GROUP_BY,NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,PIPES_AS_CONCAT,ANSI_QUOTES'

PS:参考自:http://www.cnblogs.com/grimm/p/5752259.html,http://www.ywnds.com/?p=8865

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