Re: [JDBC] Questions on use

On 12/28/2016 10:41 AM, Rich Shepard wrote:
>   There's no problem from the command line,
>
> $ psql -h localhost emapw
> psql (9.6.1)
> Type "help" for help.
>
> emapw=#
>
> even without specifying the host.

with psql, no -h  and -h localhost are two different connection types.
if you don't specify a -h, it uses a 'unix domain socket', this uses the
pg_hba.conf lines that start with `local`...   if you DO specify -h
localhost, it uses a tcp/ip socket to localhost (typically 127.0.0.1 or
::1), these match the pg_hba.conf lines that start with `host` and
encompass one or the other of those networks.   note that even if your
system isn't using ipv6 for its network connections, it very well could
be using the ipv6 localhost ::1 (shorthand for
0000:0000:0000:0000:0000:0000:0000:0001)...


--
john r pierce, recycling bits in santa cruz