Generally with DBs for which Tableau does not have a connector, there are two routes. First, you can try and figure out what type of DB is behind the system. Often times, the backing database is something like SQL Server or Oracle and you may be able to connect directly to that.
Second, sometimes vendors will actually have ODBC drivers which you can try to use to connect to the system. It is recommended that you utilize Tableau Data Extracts if you go the ODBC route as the drivers often do not have all the query features implemented that Tableau can use.
Thanks for the reply.
This is a great help for me.