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# Mojo::Pg [](https://github.com/mojolicious/mojo-pg/actions)
A tiny wrapper around [DBD::Pg](https://metacpan.org/pod/DBD::Pg) that makes [PostgreSQL](https://www.postgresql.org)
a lot of fun to use with the [Mojolicious](https://mojolicious.org) real-time web framework.
```perl
use Mojolicious::Lite -signatures;
use Mojo::Pg;
helper pg => sub { state $pg = Mojo::Pg->new('postgresql://postgres@/test') };
# Use migrations to create a table during startup
app->pg->migrations->from_data->migrate;
get '/' => sub ($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->to_array);
});
};
app->start;
__DATA__
@@ migrations
-- 1 up
CREATE TABLE visitors (at TIMESTAMP WITH TIME ZONE, ip TEXT);
-- 1 down
DROP TABLE visitors;
```
## Installation
All you need is a one-liner, it takes less than a minute.
$ curl -L https://cpanmin.us | perl - -M https://cpan.metacpan.org -n Mojo::Pg
We recommend the use of a [Perlbrew](http://perlbrew.pl) environment.
## Want to know more?
Take a look at our excellent
[documentation](https://mojolicious.org/perldoc/Mojo/Pg)!
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