问题
I'm running as mysql root user on my system.
I can select load_file('/etc/passwd'); no problem
But when I try to select load_file('/var/lib/mysql/mysql'); I get NULL as a result why? this file is good, I can cat it as root and view the mysql user data, why cant mysql load_file it? Its permissions are the default:
-rw-rw---- 1 mysql mysql 444 2009-08-04 19:08 user.MYD
It's owner is by default the user mysql and has read permission, so why doesn't mysql like to load_file it? Is mysql somehow blocking access to this file and if so how can I bypass that? Doing stuff like mysql/../mysql in the path doesn't work, and using hex encoding didn't work either?
回答1:
In order for load file to work make sure that all permissions are granted for the MySQL owner and group.
chown mysql:mysql /var/lib/mysql/foo/*
chmod go+rw /var/lib/mysql/foo/*
来源：https://stackoverflow.com/questions/1814297/cant-load-file-data-in-the-mysql-directory