Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page. X
Toolkit applications DO work with SQL databases. It is not a matter if Creo is compatible with MySql, everything is handled by the custom toolkit.
The failure is caused by something else. Check your message log and/or trail file. Sometimes you get some kind of indication about what is wrong