This looks very much like an attack last week on the Conservative Foundation fund raising site that took place on October 10 2012. This was a similar attack in that it targeted a PHP which used some external MySQL data source to publish dynamic content. The attacks are also similar in that the page carries a claim of responsibility to Own3r, though on October 10th I was told by some people involved with Anonymous that Own3r was not involved.
So we have had, in 2 weeks, 2 PHP sites that used dynamic MySQL data attacked to show messages from Anonymous, both carrying a claim of responsibility by Own3r. So these seem to be a speciality of someone of a group of people hacking MySQL sites under the name of Own3r.