In my case, the file did not exist. In MySQL Workbench I went to OPTIONS FILE and found some default values. I clicked apply. It asked for permission. It then created the my.cnf file under /etc. However, it is very important to keep in mind that the first time you click "apply", you do not make any changes to the default configuration. Once the file has been created, you can make changes which will be applied when you click "apply". Otherwise you will not be shown the apply button when you make changes.

您可以打开一个终端并键入locate my.cnf

rDefault选项按照给定的顺序从以下文件中读取: /etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf

我不知道你使用的是哪个版本的MySQL，但以下是Mac OS X 5.5版本my.cnf文件的可能位置(从这里取):

/etc/my.cnf /etc/mysql/my.cnf SYSCONFDIR / my.cnf $ MYSQL_HOME / my.cnf Defaults-extra-file(使用——Defaults-extra-file =path指定的文件，如果有的话) ~ / .my.cnf

macOS High Sierra 版本10.13.6

mysql Ver 14.14 Distrib 5.7.22，用于osx10.13 (x86_64)使用EditLine包装器 版权所有(c) 2000,2018, Oracle和/或其关联公司。版权所有

默认选项按给定顺序从以下文件中读取:

/etc/my.cnf 
/etc/mysql/my.cnf 
/usr/local/etc/my.cnf 
~/.my.cnf

对于MAMP 3.5 Mac El Capitan，创建一个单独的空配置文件，并为mysql编写额外的设置

sudo vim /Applications/MAMP/Library/my.cnf

像这样相加

[mysqld]
max_allowed_packet = 256M