Pier Luigi Fiorini schrieb:
Hello,
I'm developing a Zope application that uses a PostgreSQL connection and several ZSQL objects. People should log in using a Postgres user and ZSQL object should be executed by the user that's logged in. Multiple people can be logged at the same time. Unfortunately it is not possible because the same Postgres connection is used by all the ZSQL object. Is there a way to change the user executing a ZSQL query?


Well good news and bad news...
Good news first:

yes it can be done

Bad news:

you would have to code it ;)

You could base on the database adapter you currently
have but organize your connection pool on a per
user basis - so you need a connection with
a user-folder as well (Interesting
if you could subclass Userfolder and PsycopgDA...)
so when a user logs in you look in the connection
pool and/or authorize the user and use an idle/new
connection for this user when ZSQL methods are called.

Interesting project but not so easy.

Also in worst case you could end up having

zope-threads X users connection to your database.

And connection setup is somewhat expensive,
so if your pool is too small performance will suffer.

Regards
Tino
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