I've mentioned last week that i was working on a little something to make
using PostgreSQL with Mojolicious more fun.
https://github.com/kraih/mojo-pg
It's still very much experimental, and support for migrations is missing.
The idea is to embrace SQL, and make asynchronous queries super simple.
I'm intentionally using the word "asynchronous" here, because it is based
on DBD::Pg, so all I/O operations are blocking, but it allows us to let the
event loop do other work (like handling other HTTP requests) while we wait
for long running queries. Since database connections usually have a very
low latency, the performance with blocking I/O and asynchronous queries can
be quite excellent.
It also has some other fun properties that i'm currently experimenting with.
# Sequential but asynchronous
my $db = $pg->db;
$db->query('select * from table1' => sub {...});
$db->query('select * from table2' => sub {...});
A DBD::Pg connection can only handle one query at a time, this includes
asynchronous ones, so the example above would normally crash and burn. But
Mojo::Pg currently puts the second query into a waiting list and will
perform it on the same connection once the first query has been finished.
The example below on the other hand uses two DBD::Pg connections to
actually perform the queries concurrently.
# Concurrent and asynchronous
$pg->db->query('select * from table1' => sub {...});
$pg->db->query('select * from table2' => sub {...});
Of course i couldn't resist mojo-ifying the API a bit, so there's
Mojo::Collection objects too. :)
$pg->db->query('select foo, baz from table3 where foo = ?',
'bar')->hashes->map(sub { $->{baz} })->join->say;
I'm quite happy with the results so far, but it's still just an experiment
for now.
--
sebastian
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