Mojo::Pg

A tiny wrapper around DBD::Pg that makes PostgreSQL a lot of fun to use with the Mojolicious real-time web framework.

use Mojolicious::Lite;
use Mojo::Pg;
use 5.20.0;
use experimental 'signatures';

helper pg => sub { state $pg = Mojo::Pg->new('postgresql://postgres@/test') };

# Prepare a table during startup
app->pg->db->do(
  'create table if not exists visitors (
     at timestamp,
     ip varchar(255)
   )'
);

get '/' => sub ($c) {

  my $db = $c->pg->db;
  my $ip = $c->tx->remote_address;

  # Store information about current visitor blocking
  $db->query('insert into visitors values (now(), ?)', $ip);

  # Retrieve information about previous visitors non-blocking
  $db->query('select * from visitors limit 50' => sub ($db, $err, $results) {

    return $c->reply->exception($err) if $err;

    $c->render(json => [$results->hashes->each]);
  });
};

app->start;

Installation

All you need is a oneliner, it takes less than a minute.

$ curl -L cpanmin.us | perl - -n Mojo::Pg

We recommend the use of a Perlbrew environment.