From: Tom Lane <tgl@sss.pgh.pa.us>
To: richard coleman <rcoleman.ascentgl@gmail.com>
cc: pgsql-admin@lists.postgresql.org
Subject: Re: how to list privileges on the database object itself via SQL?
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Comments: In-reply-to richard coleman <rcoleman.ascentgl@gmail.com>
	message dated "Wed, 26 Apr 2023 13:50:18 -0400"
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Date: Wed, 26 Apr 2023 14:05:01 -0400
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richard coleman <rcoleman.ascentgl@gmail.com> writes:
> Thanks for that.  It still seems rather weird that there isn't a more
> straightforward way to get access to that information.

You could just read the system catalog documentation:

https://www.postgresql.org/docs/current/catalogs.html

psql's queries are mostly useful as a shortcut to finding out
where to look.

> Also the SQL generated by psql -E doesn't seem to work on earlier versions
> of PostgreSQL:

Yeah, you'd need to try it against a server of the vintage you
care about.  (Also read the documentation of the correct version.)

> Are you saying that the only place this information is stored
> is in an array in the datacl column of the pg_catalog.pg_database table?

Precisely.

> If that's the case then I am going to be forced to either write code to
> parse out that array, or write a looping union of multiple
> "has_database_privilege()" calls.

You were already pointed at aclexplode(), which might help.

select datname, a.* from pg_database, aclexplode(datacl) a;

			regards, tom lane