CREATE SERVER myremotedb FOREIGN DATA WRAPPER
    dblink_fdw OPTIONS (host 'myremotedb.123456.eu-west-1.rds.amazonaws.com', port '5432', dbname 'my_db');

CREATE USER MAPPING FOR treex SERVER myremotedb OPTIONS (user 'foouser', password '1234');

GRANT USAGE ON FOREIGN SERVER myremotedb TO foouser;

SELECT dblink_connect('myremotedb', 'host=myremotedb.123456.eu-west-1.rds.amazonaws.com , port=5432 , user=foouser , password=1234 , dbname=mwu');

select * from dblink('myremotedb', 'SELECT * FROM my_data') AS T(id integer, name text);