Paolo,
Visual Dialplan does not have integrated func_odbc function but you may still invoke the same by using “Custom code” component. As for the Integration Server and MySQL addon, I know that with Apstel Integration Server you can access all databases such as MS SQL, MySQL, Postgres… and in case you wish to access to MySQL database only, than you will need to use Asterisk-addons package and MySQL VDP components.
Raman