I installed MySQL via MacPorts. What is the command I need to stop the server (I need to test how my application behave when MySQL is dead)?
sudo /opt/local/etc/LaunchDaemons/org.macports.mysql5/mysql5.wrapper stop
You can also use start and restart here. I found this by looking at the contents of /Library/LaunchDaemons/org.macports.mysql.plist.
For those who used homebrew to install MySQL use the following commands below to start, stop, or restart MySQL
Brew start
/usr/local/bin/mysql.server start
Brew restart
/usr/local/bin/mysql.server restart
Brew stop
/usr/local/bin/mysql.server stop