How to set sql_mode in my.cnf in MySQL 8?

问题

I'm running MySQL 8.0.11 community version. I need to set sql_mode to exclude ONLY_FULL_GROUP_BY in my.cnf so that it's restart safe. I tried the following variants:

sql_mode= STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
sql_mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
sql-mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
sql-mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

They all fail in the same manner whether the variable is named 'sql_mode' or 'sql-mode':

mysqld --verbose --help | grep "sql[-_]mode"
2018-06-19T15:22:51.667734Z 0 [ERROR] [MY-011071] [Server] /usr/sbin/mysqld: Error while setting value 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' to 'sql_mode'
    --sql-mode=name     Syntax: sql-mode=mode[,mode[,mode...]]. See the manual
2018-06-19T15:22:51.675498Z 0 [ERROR] [MY-010119] [Server] Aborting

sql-mode

It would seem that mysqld process my.cnf and converts 'sql_mode' or 'sql-mode' to 'sql_mode', which then it rejects!

The question is how to get around this?

回答1:

The SQL mode NO_AUTO_CREATE_USER was removed in MySQL 8.0, and it's no longer recognized.

https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html#mysql-nutshell-deprecations says:

The following features related to account management are removed:

Using GRANT to create users. Instead, use CREATE USER. Following this practice makes the NO_AUTO_CREATE_USER SQL mode immaterial for GRANT statements, so it too is removed.

Change your sql_mode to "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION". I tested this on my sandbox instance of 8.0.11 and it worked.

Either spelling of sql-mode or sql_mode are both fine.

Using quotes or omitting quotes are both fine.

回答2:

Assuming that "restart safe" just means permanent, the syntax is:

sql-mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

From Setting the SQL Mode:

To set the SQL mode at server startup, use the --sql-mode="modes" option on the command line, or sql-mode="modes" in an option file such as my.cnf (Unix operating systems) or my.ini (Windows). modes is a list of different modes separated by commas.

If it doesn't work for your, perhaps you're placing it under the wrong section. For server settings that needs to be [mysqld], as in:

[mysqld]
sql-mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

回答3:

I've not found a way around the problem using my.cnf. To be mysqld restart safe, I need to avoid having to do:

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

The only way I found to get around this is to set an environment variable:

sudo systemctl set-environment MYSQLD_OPTS="--sql-mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION"
sudo systemctl restart mysqld

Better solutions welcomed.

来源：https://stackoverflow.com/questions/54007824/how-to-set-sql-mode-in-my-cnf-in-mysql-8

标签

mysql

mysql-8.0

sql-mode