Is DoSQL 2.0 compatible with FileMaker Server 12 ?

DoSQL 2.0 works fine with FileMaker Server 12 (Advanced).

Check the installer file or the help for installing instructions:
http://wiki.myfmbutler.com/index.php/DoSQL_2#Installing_DoSQL_on_Fi...

Executing the core DoSQL functions on a FileMaker Server using server side scripts or web publishing, requires a DoSQL Site or Developer license.