Accessing other databases with DBLink when leaving user/password empty

[Hermann Muster <Hermann.Muster@xxxxxx>]

Hi,

I have the following problem when trying to access other PostgreSQL 
databases with DBLink. I followed the instructions on 
http://www.postgresonline.com/journal/index.php?/archives/44-Using-DbLink-to-access-other-PostgreSQL-Databases-and-Servers.html. 


My query to get access to another database on the same server looks like 
this:

	select dblink_connect('1512','host=127.0.0.1 port=5432
	dbname=Test user=postgres password=postgres');

	select * from dblink('1512','select "Vorname", "Name" from
	"PERSONEN"')
	AS (Vorname text, Name text);

The question is if it is possible to leave the 'user' and 'password' 
empty, so that these are taken from the account I'm currently using, as 
described below (taken from the above article).

	[...]
	Below is an example of querying a database on the same server 	
	and cluster using DbLink. Note if no username and password is
	specified, then DbLink connects with whatever account you are
	currently using.

It is not possible to connect to the other database when they are empty 
and it seems that DBLink can't get them from the currently used account. 
Can you please help me with that? Thank you.

Regards,
H. Muster