memory location, not data question

[tom poe]

Hi:  I can connect to PostgreSQL, which is good.  Now, how do I clear this up?
tompoe@aether:~/perlStuff > dbistart
DBI::st=HASH(0x81e31bc)
tompoe@aether:~/perlStuff > 

Not sure what the topic is to look up this output.  The code is:
#! /usr/bin/perl5.6.0 -w
# Programming the Perl DBI
# ch05/prepare/ex1: Simply creates a database handle and a statement
#handle
use strict;
use DBI;

### The database handle
my $dbh = DBI->connect('dbi:Pg:dbname=tomdb');

### The statement handle
my $sth = $dbh->prepare( "SELECT name FROM friend" );
print "$sth\n";

$dbh->disconnect();

exit;

Any help appreciated.  Thanks, Tom