Mac 运行项目 Mysql8.0及以上 only_full_group_by报错解决方案 (windows同理)

邴子实
2023-12-01

Mysql8.0及以上 only_full_group_by报错解决方案

问题原因

在mysql8.0及以上的版本中,数据库sql_mode默认设置了only_full_group_by

方法一(适合mysql长期不重启、电脑不关机用户)

终端

进入mysql
终端输入 :    /usr/local/MySQL/bin/mysql -u root -p
然后输入密码进入mysql
输入:SELECT @@sql_mode;  
可以看到如下显示结果:
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_ENGINE_SUBSTITUTION |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
通过以下脚本关闭 :
SET SESSION sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY,',''));

再次查询 @@sql_mode 返回中应该已经没有该模式了。

mysql> SELECT @@sql_mode;
+----------------------------------------------------------------------------------------------------+
| @@sql_mode                                                                                         |
+----------------------------------------------------------------------------------------------------+
| STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION |
+----------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

navicat

选择对应数据库,同上执行下面两句,可以查看和配置sql_mode
SELECT @@sql_mode;  
SET SESSION sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY,',''));

弊端

mysql重启后失效,需要重新配置。

方法二:通过修改my.cnf配置文件

首先MAC下默认没有my.cnf配置文件,需要自己创建

首先进入etc 文件夹
cd /etc
然后通过 sudo vi my.cnf(一般需要管理权限执行,不然会报:"my.cnf" E212: Can't open file for writing)
创建并编写文件,然后按 i,进行编写
并将下述内容复制到文件中
# Example MySQL config file for small systems.  
#  
# This is for a system with little memory (<= 64M) where MySQL is only used  
# from time to time and it's important that the mysqld daemon  
# doesn't use much resources.  
#  
# MySQL programs look for option files in a set of  
# locations which depend on the deployment platform.  
# You can copy this option file to one of those  
# locations. For information about these locations, see:  
# http://dev.mysql.com/doc/mysql/en/option-files.html  
#  
# In this file, you can use all long options that a program supports.  
# If you want to know which options a program supports, run the program  
# with the "--help" option.  

# The following options will be passed to all MySQL clients  
[client]  
default-character-set=utf8  
#password   = your_password  
port        = 3306 
socket      = /tmp/mysql.sock  

# Here follows entries for some specific programs  

# The MySQL server   
[mysqld]  
default-storage-engine=INNODB  
character-set-server=utf8  
collation-server=utf8_general_ci  
port        = 3306 
socket      = /tmp/mysql.sock  
skip-external-locking  
key_buffer_size = 16K  
max_allowed_packet = 1M  
table_open_cache = 4 
sort_buffer_size = 64K  
read_buffer_size = 256K  
read_rnd_buffer_size = 256K  
net_buffer_length = 2K  
thread_stack = 128K  

# Don't listen on a TCP/IP port at all. This can be a security enhancement,  
# if all processes that need to connect to mysqld run on the same host.  
# All interaction with mysqld must be made via Unix sockets or named pipes.  
# Note that using this option without enabling named pipes on Windows  
# (using the "enable-named-pipe" option) will render mysqld useless!  
#   
#skip-networking  
server-id   = 1 

# Uncomment the following if you want to log updates  
#log-bin=mysql-bin  

# binary logging format - mixed recommended  
#binlog_format=mixed  

# Causes updates to non-transactional engines using statement format to be  
# written directly to binary log. Before using this option make sure that  
# there are no dependencies between transactional and non-transactional  
# tables such as in the statement INSERT INTO t_myisam SELECT * FROM  
# t_innodb; otherwise, slaves may diverge from the master.  
#binlog_direct_non_transactional_updates=TRUE  

# Uncomment the following if you are using InnoDB tables  
#innodb_data_home_dir = /usr/local/mysql/data  
#innodb_data_file_path = ibdata1:10M:autoextend  
#innodb_log_group_home_dir = /usr/local/mysql/data  
# You can set .._buffer_pool_size up to 50 - 80 %  
# of RAM but beware of setting memory usage too high  
#innodb_buffer_pool_size = 16M  
#innodb_additional_mem_pool_size = 2M  
# Set .._log_file_size to 25 % of buffer pool size  
#innodb_log_file_size = 5M  
#innodb_log_buffer_size = 8M  
#innodb_flush_log_at_trx_commit = 1 
#innodb_lock_wait_timeout = 50 

[mysqldump]  
quick  
max_allowed_packet = 16M  

[mysql]  
no-auto-rehash  
# Remove the next comment character if you are not familiar with SQL  
#safe-updates  

[myisamchk]  
key_buffer_size = 8M  
sort_buffer_size = 8M  

[mysqlhotcopy]  
interactive-timeout 

[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

使用:wq!命令保存退出文件
修改下my.cnf的文件权限

sudo chmod 664 /etc/my.cnf 

最后重启Mysql,配置文件就可以生效了

方法三:通过改代码实现

可以通过 ANY_VALUE() 来改造查询语句以避免报错。

使用 ANY_VALUE() 包裹的值不会被检查,跳过该错误。所以这样是可以的:
如下所示

SELECT gender, 
-       last_name(改前)
+       ANY_VALUE(last_name) (改后)
FROM   employees 
GROUP  BY gender 

参考:
https://www.cnblogs.com/Wayou/p/mysql_group_by_issue.html
https://blog.csdn.net/weixin_38106322/article/details/105345643

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