To have launchd start mysql at login:mysql
ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgentssql
Then to load mysql now:server
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plisthomebrew
Or, if you don't want/need launchctl, you can just run:ant
mysql.server starttar