Read and show data from db tables that I've added to CMS

[noidea]

Is there a easy way of doing this? I need some dynamic data for showing all those things I've written in a db on a page with cms. At the moment as I can see web pages are also read from db but is there some module or I need to write down some changes so I can add to those web pages some my "macros" to read db and add that info in a web page?