Just for the records, I found a blog post how to use row level security in 
postgres with one application db-user:

https://blog.2ndquadrant.com/application-users-vs-row-level-security/

Here is the essential code:

SET my.username = 'tomas'

CREATE POLICY chat_policy ON chat
    USING (current_setting('my.username') IN (message_from, message_to))
    WITH CHECK (message_from = current_setting('my.username'))

Regards,
  Thomas Güttler



Am Dienstag, 11. Juli 2017 11:40:53 UTC+2 schrieb guettli:
>
> I guess most applications have exactly one database user.
>
> Why not use one database for each application user?
>
> Example: User "foo" in my web application has a corresponding database 
> user "foo".
>
> This way you could use row level security from the database.
>
> PostgreSQL has a lot of interesting features: 
> https://www.postgresql.org/docs/devel/static/ddl-rowsecurity.html
>
> Use case: Show me all items which user "foo" is allowed to see.
>

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