Re: Permissions

Milen Dzhumerov <gamehack(at)gmail(dot)com> writes:
> I've been trying to figure a few things lately but I could not so I'm
> asking on the list. I need to programmatically (through JDBC):

> 1. Figure out if the currently logged in user can create a schema
> 2. Figure out if a role has USAGE privileges on a schema
> 3. Figure out if a role has CREATE privileges on a schema
> 4. Figure out if a user can create a table in a schema

> I've been reading the online docs but I could nowhere see any examples
> of finding out that information through the information_schema schema. I
> was advised not to poke around with the pg_* schemas since they can
> change frequently.

Check out the has_foo_privilege family of functions:
http://www.postgresql.org/docs/8.1/static/functions-info.html

> I can retrieve all the necessary permissions for tables from the
> information_schema.table_privileges table with no problems but I'm
> puzzled about database & schema privileges.

I think that those privileges are PG extensions to the standard, which
is why the standard information_schema views don't know about them ...

regards, tom lane