How to use multiplexer?

Hi guys! I'm trying to connect to a database - which I already did by using an ODBC driver. Now, I have an XML file that has some parameters that need to pass through a multiplexer in order to access the functions I need. I have no idea how to do it. I saw that I have to set up an environment so I used

>> setenv('NAME','ADDRESS')

>> getenv('NAME')

ans = 'ADDRESS'

But that's all I have. How can I connect the environment address and the xml files?

Sorry, does this make sense? I'm very new to database stuff when it comes to Matlab so I really have no idea about this.

Thank you!