How To Connect to another Database inside a plpgsql function

Hi Guys!

 

I have 2 database namely "DB1" and "DB2".

 

In DB1 I created a plgpsql function fnTest().

 

My problem is inside fnTest() I need to check some tables in DB2! I've no idea how to do this. Usually when I make a function I only access tables/views/functions in the same database. I really don't know if this is possible.

 

BTW, I googled my problem but did not see any topics on this.

 

Need your expertise on this one guys...TIA!