[fw-db] how to use zend db with joins

Just a general question on how to best utilise zend db. I have a few tables
which I want to display with join statements and update afterwards. Not a
very complicated schema but quite some fields which I want to select
individually. To my limited understanding of DB I have the following
options:

- instantiate an adapter and just go from there using db->query() etc.
- use db select
- instantiate a db table for each of my tables and use joins (or db select?)
from there.

>From what I've read in the manual it seems like only use an adapter gives
the least overhead. Db select is only for complicated queries and anyway you
cannot update with joins. Instantiate db tables for each table also sounds
like some overhead and I do not see the advantages.

Anyone any thoughts on this?

And another thing: do I need to instantiate an adapter but have the
resource.db.params in my application.ini . In that case, is the adapter
already instantiated and if so how do I reference it. If not, using the
db_factory? But it asks for parameters.
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