oop - OOMD - Is there a need of showing database connection in UML Class diagram? (A simple login diagram) -

i want design class diagram of simple login operation. use case is:

1. user enters id , pin
2. system checks login info.

so, decided create controller user (userhandler) , user class (user). userhandler takes id , pin , checks valid method ( isuservalid() ).

in opinion, class should not include database records 1 of them. mean there should not list of users check whether login info correct or not. simple operation requirement of connecting database.

question how can show isuservalid() method connecting database? there need of showing connection?

or should create userlist in userhandler , keep users in list?

appriciated.

you create authorization class takes user name/password authorize. authorization class users database. model association multiplicity.