The Title is "Are you prepared for the attack of the MySQL worm?"
With all of the real security issues that exist on the Internet I dislike seeing people dream this stuff up.
The author mentions have a piece of SQL inject itself into an event (which you don't need, this could be done with a stored procedure and a sleep() call), and a Federated table.
Let us talk about why this is a non issue:
One other question you should ask, why hasn't this happened before?
Postgres has their DBI based federation, SQL Server has its own ODBC federated, and Oracle has its database link technology. Federating connections is nothing new. Using UDFs, which most vendors have, can be used to create more interesting problems.
Worry about cross scripting attacks, spend time making sure you lock down the ports you make available to the world... teach people to use good passwords and to not click on executables in their email!
I am more concerned about blue tooth viruses infecting the cars around me :)