Import .db file and work from that database

[tiagoggdev]

Hi, first sorry for my english, I need help
I have a .db file in my directory and I need import this db for i need import get and update data from my tables.
Basically I don't need to create my database with code but rather adapt the code for an already created database, something like that a database first model.

I didn't find any information in the documentation on how to import a database file, somebody can tell me if its can do it?