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MySQL sql_mode修改不生效的原因及解决

前言

近期多次聊到sql_mode的话题,也是多次遇到相关问题,今天就趁热打铁,再给大家带来一个sql_mode的案例分享。

场景模拟

基于业务敏感性的考虑,下面涉及的表、存储过程等均非真实数据,但并不影响排查过程。

(1)客户侧开发童鞋创建了一个存储过程,该存储过程没有严格遵守group by标准语法

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session 1:

mysql> delimiter //

 

mysql> create procedure test_for_group_by()

    -> begin

    -> select k,pad,count(*) from test.test group by k;

    -> end //

Query OK, 0 rows affected (0.01 sec)

 

mysql> delimiter ;

(2)客户侧开发童鞋调用该存储过程,报错ERROR 1140;因为当时存储过程比较复杂,改造起来比较麻烦,所以客户侧选择修改sql_mode

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session 1:

mysql> call test_for_group_by();

ERROR 1140 (42000): In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'test.test.k'; this is incompatible with sql_mode=only_full_group_by

(3)客户侧修改完sql_mode,再次执行,发现仍然报错ERROR 1140

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session 2:

mysql> set global sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

Query OK, 0 rows affected (0.00 sec)

 

session 1:

mysql> call test_for_group_by();

ERROR 1140 (42000): In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'test.test.k'; this is incompatible with sql_mode=only_full_group_by

(4)此时想到,修改系统变量,只对新建连接有效,对已有连接不起作用;于是,让客户侧重新建立连接,确认系统变量已生效,再次调用存储过程,但仍然报错ERROR 1140,重复尝试几次都是这个结果

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session 3:

mysql> show variables like 'sql_mode';

+---------------+------------------------------------------------------------------------------------------------------------------------+

| Variable_name | Value                                                                                                                  |

+---------------+------------------------------------------------------------------------------------------------------------------------+

| sql_mode      | 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 (0.01 sec)

 

mysql> call test_for_group_by();

ERROR 1140 (42000): In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'test.test.k'; this is incompatible with sql_mode=only_full_group_by

(5)进一步排查,让客户侧在该会话,执行非标准的group by语句,发现可以正常执行

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session 3:

mysql> select user,host,count(*) From mysql.user group by user;

+---------------+-----------+----------+

| user          | host      | count(*) |

+---------------+-----------+----------+

| mysql.session | localhost |        1 |

| mysql.sys     | localhost |        1 |

| root          | localhost |        1 |

| rpl_user      | %         |        1 |

| test          | %         |        1 |

+---------------+-----------+----------+

5 rows in set (0.00 sec)

(6)继续排查发现,该存储过程的sql_mode,还是包括ONLY_FULL_GROUP_BY,因此执行报错

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session 2:

mysql> select routine_catalog,routine_schema,routine_name,routine_type,created,last_altered,sql_mode from routines where routine_name='test_for_group_by';

+-----------------+----------------+-------------------+--------------+---------------------+---------------------+-------------------------------------------------------------------------------------------------------------------------------------------+

| routine_catalog | routine_schema | routine_name      | routine_type | created             | last_altered        | sql_mode                                                                                                                                  |

+-----------------+----------------+-------------------+--------------+---------------------+---------------------+-------------------------------------------------------------------------------------------------------------------------------------------+

| def             | test           | test_for_group_by | PROCEDURE    | 2020-12-24 12:12:10 | 2020-12-24 12:12:10 | 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)

(7)这里我们也可以知道,系统变量修改只对新建对象有效,对已有对象不生效;解决办法很简单,重建该存储过程即可

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session 3:

mysql> drop procedure test_for_group_by;

Query OK, 0 rows affected (0.01 sec)

 

mysql> delimiter //

 

mysql> create procedure test_for_group_by()

    -> begin

    -> select k,pad,count(*) from test.test group by k;

    -> end //

Query OK, 0 rows affected (0.01 sec)

 

mysql> delimiter ;

 

mysql> call test_for_group_by();

+--------+-------------------------------------------------------------+----------+

| k      | pad                                                         | count(*) |

+--------+-------------------------------------------------------------+----------+

| 393975 | 35227182905-15234265621-59793845249-15413569710-23749555118 |        1 |

| 495688 | 09512147864-77936258834-40901700703-13541171421-15205431759 |        1 |

| 497896 | 13152283289-69561545685-52868757241-04245213425-69280254356 |        1 |

| 498573 | 43131080328-59298106536-35954612339-97546855884-75769514803 |        1 |

| 500775 | 27590239742-20204899609-34345212327-79811525340-24267764271 |        1 |

| 501885 | 63188288836-92351140030-06390587585-66802097351-49282961843 |        1 |

| 503330 | 01495266405-82925129145-92643983850-90243995398-18709399387 |        1 |

| 503666 | 40929980986-33813039690-13155419391-97985458477-39771362212 |        1 |

| 504353 | 00505722282-72931248925-57037623248-81117963809-88658076981 |        1 |

| 514246 | 21979564480-87492594656-60524686334-78820761788-57684966682 |        1 |

+--------+-------------------------------------------------------------+----------+

10 rows in set (0.00 sec)

 

Query OK, 0 rows affected (0.00 sec)

总结

通过这个案例,我们可以知道,修改sql_mode系统变量,只对新建连接和新建对象(主要包括函数和存储过程)有效,对已有连接和已有对象不生效。

以上就是MySQL sql_mode修改不生效的原因及解决的详细内容


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