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Mojo-Pg-Che-0.852
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Mojo::Pg::Che

¡ ¡ ¡ ALL GLORY TO GLORIA ! ! !

NAME

Mojo::Pg::Che - mix of parent Mojo::Pg and DBI.pm

DESCRIPTION

See Mojo::Pg

VERSION

Version 0.852

SYNOPSIS

use Mojo::Pg::Che;

my $pg = Mojo::Pg::Che->connect("dbname=test;", "postgres", 'pg-pwd', \%attrs);
# or
my $pg = Mojo::Pg::Che->new
  ->dsn("DBI:Pg:dbname=test;")
  ->username("postgres")
  ->password('pg--pw')
  ->options(\%attrs);

# or
my $pg = Mojo::Pg->new('pg://postgres@/test');

# Bloking query
my $result = $pg->query('select ...', undef, @bind);

# Non-blocking query
my $result = $pg->query('select ...', {Async => 1, ...}, @bind);

# Cached query
my $result = $pg->query('select ...', {Cached => 1, ...}, @bind);

# prepare sth
my $sth = $pg->prepare('select ...');

# cached async sth
my $sth = $pg->prepare_cached('select ...', {Async => 1,},);

# Non-blocking query for async sth
$pg->query($sth, undef, @bind, sub {my ($db, $err, $result) = @_; ...});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;


# Result non-blocking query for async sth
my $ref_cb = $pg->query($sth, {Async => 1,}, @bind,);
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
# Mojo::Pg::Results style
my res = $$ref_cb->()->hash;
# same DBI style
my $res  = $$ref_cb->()->fetchrow_hashref;

# Mojo::Pg style
my $now = $pg->db->query('select now() as now')->hash->{now};
$pg->db->query('select pg_sleep(?::int), now() as now', undef, 2, $cb);

# DBI style
my $now = $pg->selectrow_hashref('select now() as now')->{now};
my $now = $pg->db->selectrow_hashref('select now() as now')->{now};

my $now = $pg->selectrow_array('select now() as now');

Transaction syntax

eval {
  my $tx = $pg->begin;
  $tx->query('insert into foo (name) values (?)', 'bar');
  $tx->do('insert into foo (name) values (?)', 'baz');
  $tx->commit;
};
die $@ if $@;

my $db = $pg->db;
$db->begin;
$db->do('insert into foo (name) values (?)', 'bazzzz');
$db->rollback;
$db->begin;
$db->query('insert into foo (name) values (?)', 'barrr');
$db->commit;

Non-blocking query cases

Depends on $attr->{Async} and callback:

1. $attr->{Async} set to 1. None $cb pass. Callback will create inside methods ->query() ->select...() and will returns ref on that callback. You need start Mojo::IOLoop:

# async sth
my $sth = $pg->prepare('select ...', {Async => 1,},);
# Result non-blocking query for async sth
my $res_cb = $pg->query($sth, {Async => 1,}, @bind,);
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
# Mojo::Pg::Results style
my res = $$res_cb->()->hash;

2. $attr->{Async} not set. $cb defined. Results pass to $cb. You need start Mojo::IOLoop:

my @results;
my $cb = sub {
  my ($db, $err, $results) = @_;
  die $err if $err;
  push @results, $results;
};
$pg->query('select ?::date as d, pg_sleep(?::int)', undef, ("2016-06-$_", 1), $cb)
  for 17..23;
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
like($_->hash->{d}, qr/2016-06-\d+/, 'correct async query')
  for @results;

3. $attr->{Async} set to 1. $cb defined. Results pass to $cb. You need start Mojo::IOLoop.

METHODS

All methods from parent module Mojo::Pg are inherits and implements the following new ones.

connect

DBI-style of new object instance. See DBI#connect

db

Overriden method of Mojo::Pg#db. Because can first input param - DBI database handler (when prepared statement used).

prepare

Prepare and return DBI statement handler for query string.

prepare_cached

Prepare and return DBI cached statement handler for query string.

query

Like Mojo::Pg::Database#query but input params - Mojo::Pg::Che#Params-for-quering-methods

Blocking query without attr Async or callback.

Non-blocking query with attr Async or callback.

select

Same method query.

selectrow_array

DBI style quering. See DBI#selectrow_array. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

selectrow_arrayref

DBI style quering. See DBI#selectrow_arrayref. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

selectrow_hashref

DBI style quering. See DBI#selectrow_hashref. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

selectall_arrayref

DBI style quering. See DBI#selectall_arrayref. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

selectall_hashref

DBI style quering. See DBI#selectall_hashref. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

selectcol_arrayref

DBI style quering. See DBI#selectcol_arrayref. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

do

DBI style quering. See DBI#do. Blocking | non-blocking. Input params - Mojo::Pg::Che#Params-for-quering-methods.

begin

Start transaction and return new Mojo::Pg::Che::Database object which attr {tx} is a Mojo::Pg::Transaction object. Sinonyms are: ->tx and ->begin_work.

Params for quering methods

The methods query, select..., do has next ordered input params:

  • String query | statement handler object

  • Hashref attrs (optional)

  • Array of bind values (optional)

  • Last param - callback/coderef for non-blocking (optional)

SEE ALSO

Mojo::Pg

DBI

AUTHOR

Михаил Че (Mikhail Che), <mche[-at-]cpan.org>

BUGS / CONTRIBUTING

Please report any bugs or feature requests at https://github.com/mche/Mojo-Pg-Che/issues. Pull requests also welcome.

COPYRIGHT

Copyright 2016 Mikhail Che.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.