Copying data from DB source

[Foo Lard]

Hi all,

I currently have a number of tasks that copies data from Oracle, does some transformation/enrichment and then writes it to MariaDB.

While I can use Luigi MySqlTarget to write to DB and extend the Task abstract class to perform the enrichment, what's the recommended way to query data from a DB?  

Do I perform the data querying in the run() method in my custom class or is there a more preferred way?

Thanks.