Logged in User specific Data

I'm Yogesh just now started to use Mendix 2 months back, I have a doubt that needs to get data of a particular login user (eg:- If Entity [A] contains the 10 users and Entity [B] contains the product name and quantity. Everyone should log in through their credentials and have to buy something. In this case, whoever logged in, should get the history of their purchase alone). As a fresher, I expecting a detailed explanation please.   Thank you.
1 answers

You will need to look at using XPath to constrain the data to specific users. 

It’s quite a big area, so I’d recommend you look at the Mendix Academy where they go into this in depth. Section 9 of the Crash Course is a good start, in particular 9.7.