/usr/share/perl5/Mojo/Pg/Database.pm is in libmojo-pg-perl 4.04-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use Mojo::Base 'Mojo::EventEmitter';
use Carp qw(croak shortmess);
use DBD::Pg ':async';
use Mojo::IOLoop;
use Mojo::JSON 'to_json';
use Mojo::Pg::Results;
use Mojo::Pg::Transaction;
use Mojo::Promise;
use Mojo::Util 'monkey_patch';
use Scalar::Util 'weaken';
has [qw(dbh pg)];
has results_class => 'Mojo::Pg::Results';
for my $name (qw(delete insert select update)) {
monkey_patch __PACKAGE__, $name, sub {
my ($self, @cb) = (shift, ref $_[-1] eq 'CODE' ? pop : ());
return $self->query($self->pg->abstract->$name(@_), @cb);
};
monkey_patch __PACKAGE__, "${name}_p", sub {
my $self = shift;
return $self->query_p($self->pg->abstract->$name(@_));
};
}
sub DESTROY {
my $self = shift;
my $waiting = $self->{waiting};
$waiting->{cb}($self, 'Premature connection close', undef) if $waiting->{cb};
return unless (my $pg = $self->pg) && (my $dbh = $self->dbh);
$pg->_enqueue($dbh) unless $dbh->{private_mojo_no_reuse};
}
sub begin {
my $self = shift;
my $tx = Mojo::Pg::Transaction->new(db => $self);
weaken $tx->{db};
return $tx;
}
sub disconnect {
my $self = shift;
$self->_unwatch;
$self->dbh->disconnect;
}
sub dollar_only { ++$_[0]{dollar_only} and return $_[0] }
sub is_listening { !!keys %{shift->{listen} || {}} }
sub listen {
my ($self, $name) = @_;
my $dbh = $self->dbh;
$dbh->do('listen ' . $dbh->quote_identifier($name))
unless $self->{listen}{$name}++;
$self->_watch;
return $self;
}
sub notify {
my ($self, $name, $payload) = @_;
my $dbh = $self->dbh;
my $notify = 'notify ' . $dbh->quote_identifier($name);
$notify .= ', ' . $dbh->quote($payload) if defined $payload;
$dbh->do($notify);
$self->_notifications;
return $self;
}
sub pid { shift->dbh->{pg_pid} }
sub ping { shift->dbh->ping }
sub query {
my ($self, $query) = (shift, shift);
my $cb = ref $_[-1] eq 'CODE' ? pop : undef;
croak 'Non-blocking query already in progress' if $self->{waiting};
my %attrs;
$attrs{pg_placeholder_dollaronly} = 1 if delete $self->{dollar_only};
$attrs{pg_async} = PG_ASYNC if $cb;
my $sth = $self->dbh->prepare_cached($query, \%attrs, 3);
local $sth->{HandleError} = sub { $_[0] = shortmess $_[0]; 0 };
for (my $i = 0; $#_ >= $i; $i++) {
my ($param, $attrs) = ($_[$i], {});
if (ref $param eq 'HASH') {
if (exists $param->{json}) { $param = to_json $param->{json} }
elsif (exists $param->{type} && exists $param->{value}) {
($attrs->{pg_type}, $param) = @{$param}{qw(type value)};
}
}
$sth->bind_param($i + 1, $param, $attrs);
}
$sth->execute;
# Blocking
unless ($cb) {
$self->_notifications;
return $self->results_class->new(db => $self, sth => $sth);
}
# Non-blocking
$self->{waiting} = {cb => $cb, sth => $sth};
$self->_watch;
}
sub query_p {
my $self = shift;
my $promise = Mojo::Promise->new;
$self->query(
@_ => sub { $_[1] ? $promise->reject($_[1]) : $promise->resolve($_[2]) });
return $promise;
}
sub tables {
my @tables = shift->dbh->tables('', '', '', '');
return [grep { $_ !~ /^(?:pg_catalog|information_schema)\./ } @tables];
}
sub unlisten {
my ($self, $name) = @_;
my $dbh = $self->dbh;
$dbh->do('unlisten ' . $dbh->quote_identifier($name));
$name eq '*' ? delete $self->{listen} : delete $self->{listen}{$name};
$self->_unwatch unless $self->{waiting} || $self->is_listening;
return $self;
}
sub _notifications {
my $self = shift;
my $dbh = $self->dbh;
while (my $n = $dbh->pg_notifies) { $self->emit(notification => @$n) }
}
sub _unwatch {
my $self = shift;
return unless delete $self->{watching};
Mojo::IOLoop->singleton->reactor->remove($self->{handle});
$self->emit('close') if $self->is_listening;
}
sub _watch {
my $self = shift;
return if $self->{watching} || $self->{watching}++;
my $dbh = $self->dbh;
unless ($self->{handle}) {
open $self->{handle}, '<&', $dbh->{pg_socket} or die "Can't dup: $!";
}
Mojo::IOLoop->singleton->reactor->io(
$self->{handle} => sub {
my $reactor = shift;
$self->_unwatch if !eval { $self->_notifications; 1 };
return unless $self->{waiting} && $dbh->pg_ready;
my ($sth, $cb) = @{delete $self->{waiting}}{qw(sth cb)};
# Do not raise exceptions inside the event loop
my $result = do { local $dbh->{RaiseError} = 0; $dbh->pg_result };
my $err = defined $result ? undef : $dbh->errstr;
$self->$cb($err, $self->results_class->new(db => $self, sth => $sth));
$self->_unwatch unless $self->{waiting} || $self->is_listening;
}
)->watch($self->{handle}, 1, 0);
}
1;
=encoding utf8
=head1 NAME
Mojo::Pg::Database - Database
=head1 SYNOPSIS
use Mojo::Pg::Database;
my $db = Mojo::Pg::Database->new(pg => $pg, dbh => $dbh);
$db->query('select * from foo')
->hashes->map(sub { $_->{bar} })->join("\n")->say;
=head1 DESCRIPTION
L<Mojo::Pg::Database> is a container for L<DBD::Pg> database handles used by
L<Mojo::Pg>.
=head1 EVENTS
L<Mojo::Pg::Database> inherits all events from L<Mojo::EventEmitter> and can
emit the following new ones.
=head2 close
$db->on(close => sub {
my $db = shift;
...
});
Emitted when the database connection gets closed while waiting for
notifications.
=head2 notification
$db->on(notification => sub {
my ($db, $name, $pid, $payload) = @_;
...
});
Emitted when a notification has been received.
=head1 ATTRIBUTES
L<Mojo::Pg::Database> implements the following attributes.
=head2 dbh
my $dbh = $db->dbh;
$db = $db->dbh($dbh);
L<DBD::Pg> database handle used for all queries.
# Use DBI utility methods
my $quoted = $db->dbh->quote_identifier('foo.bar');
=head2 pg
my $pg = $db->pg;
$db = $db->pg(Mojo::Pg->new);
L<Mojo::Pg> object this database belongs to.
=head2 results_class
my $class = $db->results_class;
$db = $db->results_class('MyApp::Results');
Class to be used by L</"query">, defaults to L<Mojo::Pg::Results>. Note that
this class needs to have already been loaded before L</"query"> is called.
=head1 METHODS
L<Mojo::Pg::Database> inherits all methods from L<Mojo::EventEmitter> and
implements the following new ones.
=head2 begin
my $tx = $db->begin;
Begin transaction and return L<Mojo::Pg::Transaction> object, which will
automatically roll back the transaction unless
L<Mojo::Pg::Transaction/"commit"> has been called before it is destroyed.
# Insert rows in a transaction
eval {
my $tx = $db->begin;
$db->insert('frameworks', {name => 'Catalyst'});
$db->insert('frameworks', {name => 'Mojolicious'});
$tx->commit;
};
say $@ if $@;
=head2 delete
my $results = $db->delete($table, \%where, \%options);
Generate a C<DELETE> statement with L<Mojo::Pg/"abstract"> (usually an
L<SQL::Abstract> object) and execute it with L</"query">. You can also append a
callback to perform operations non-blocking.
$db->delete(some_table => sub {
my ($db, $err, $results) = @_;
...
});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Use all the same argument variations you would pass to the C<delete> method of
L<SQL::Abstract>.
# "delete from some_table"
$db->delete('some_table');
# "delete from some_table where foo = 'bar'"
$db->delete('some_table', {foo => 'bar'});
# "delete from some_table where foo like '%test%'"
$db->delete('some_table', {foo => {-like => '%test%'}});
# "delete from some_table where foo = 'bar' returning id"
$db->delete('some_table', {foo => 'bar'}, {returning => 'id'});
=head2 delete_p
my $promise = $db->delete_p($table, \%where, \%options);
Same as L</"delete">, but performs all operations non-blocking and returns a
L<Mojo::Promise> object instead of accepting a callback.
$db->delete_p('some_table')->then(sub {
my $results = shift;
...
})->catch(sub {
my $err = shift;
...
})->wait;
=head2 disconnect
$db->disconnect;
Disconnect L</"dbh"> and prevent it from getting reused.
=head2 dollar_only
$db = $db->dollar_only;
Activate C<pg_placeholder_dollaronly> for next L</"query"> call and allow C<?>
to be used as an operator.
# Check for a key in a JSON document
$db->dollar_only->query('select * from foo where bar ? $1', 'baz')
->expand->hashes->map(sub { $_->{bar}{baz} })->join("\n")->say;
=head2 insert
my $results = $db->insert($table, \@values || \%fieldvals, \%options);
Generate an C<INSERT> statement with L<Mojo::Pg/"abstract"> (usually an
L<SQL::Abstract> object) and execute it with L</"query">. You can also append a
callback to perform operations non-blocking.
$db->insert(some_table => {foo => 'bar'} => sub {
my ($db, $err, $results) = @_;
...
});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Use all the same argument variations you would pass to the C<insert> method of
L<SQL::Abstract>.
# "insert into some_table (foo, baz) values ('bar', 'yada')"
$db->insert('some_table', {foo => 'bar', baz => 'yada'});
# "insert into some_table (foo) values ({1,2,3})"
$db->insert('some_table', {foo => [1, 2, 3]});
# "insert into some_table (foo) values ('bar') returning id"
$db->insert('some_table', {foo => 'bar'}, {returning => 'id'});
# "insert into some_table (foo) values ('bar') returning id, foo"
$db->insert('some_table', {foo => 'bar'}, {returning => ['id', 'foo']});
=head2 insert_p
my $promise = $db->insert_p($table, \@values || \%fieldvals, \%options);
Same as L</"insert">, but performs all operations non-blocking and returns a
L<Mojo::Promise> object instead of accepting a callback.
$db->insert_p(some_table => {foo => 'bar'})->then(sub {
my $results = shift;
...
})->catch(sub {
my $err = shift;
...
})->wait;
=head2 is_listening
my $bool = $db->is_listening;
Check if L</"dbh"> is listening for notifications.
=head2 listen
$db = $db->listen('foo');
Subscribe to a channel and receive L</"notification"> events when the
L<Mojo::IOLoop> event loop is running.
=head2 notify
$db = $db->notify('foo');
$db = $db->notify(foo => 'bar');
Notify a channel.
=head2 pid
my $pid = $db->pid;
Return the process id of the backend server process.
=head2 ping
my $bool = $db->ping;
Check database connection.
=head2 query
my $results = $db->query('select * from foo');
my $results = $db->query('insert into foo values (?, ?, ?)', @values);
my $results = $db->query('select ?::json as foo', {json => {bar => 'baz'}});
Execute a blocking L<SQL|http://www.postgresql.org/docs/current/static/sql.html>
statement and return a results object based on L</"results_class"> (which is
usually L<Mojo::Pg::Results>) with the query results. The L<DBD::Pg> statement
handle will be automatically reused when it is not active anymore, to increase
the performance of future queries. You can also append a callback to perform
operations non-blocking.
$db->query('insert into foo values (?, ?, ?)' => @values => sub {
my ($db, $err, $results) = @_;
...
});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Hash reference arguments containing a value named C<json>, will be encoded to
JSON text with L<Mojo::JSON/"to_json">. To accomplish the reverse, you can use
the method L<Mojo::Pg::Results/"expand">, which automatically decodes all fields
of the types C<json> and C<jsonb> with L<Mojo::JSON/"from_json"> to Perl values.
# "I ♥ Mojolicious!"
$db->query('select ?::jsonb as foo', {json => {bar => 'I ♥ Mojolicious!'}})
->expand->hash->{foo}{bar};
Hash reference arguments containing values named C<type> and C<value>, can be
used to bind specific L<DBD::Pg> data types to placeholders.
# Insert binary data
use DBD::Pg ':pg_types';
$db->query('insert into bar values (?)', {type => PG_BYTEA, value => $bytes});
=head2 query_p
my $promise = $db->query_p('select * from foo');
Same as L</"query">, but performs all operations non-blocking and returns a
L<Mojo::Promise> object instead of accepting a callback.
$db->query_p('insert into foo values (?, ?, ?)' => @values)->then(sub {
my $results = shift;
...
})->catch(sub {
my $err = shift;
...
})->wait;
=head2 select
my $results = $db->select($source, $fields, $where, $order);
Generate a C<SELECT> statement with L<Mojo::Pg/"abstract"> (usually an
L<SQL::Abstract> object) and execute it with L</"query">. You can also append a
callback to perform operations non-blocking.
$db->select(some_table => ['foo'] => {bar => 'yada'} => sub {
my ($db, $err, $results) = @_;
...
});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Use all the same argument variations you would pass to the C<select> method of
L<SQL::Abstract>.
# "select * from some_table"
$db->select('some_table');
# "select id, foo from some_table"
$db->select('some_table', ['id', 'foo']);
# "select * from some_table where foo = 'bar'"
$db->select('some_table', undef, {foo => 'bar'});
# "select * from some_table where foo = 'bar' order by id desc"
$db->select('some_table', undef, {foo => 'bar'}, {-desc => 'id'});
# "select * from some_table where foo like '%test%'"
$db->select('some_table', undef, {foo => {-like => '%test%'}});
=head2 select_p
my $promise = $db->select_p($source, $fields, $where, $order);
Same as L</"select">, but performs all operations non-blocking and returns a
L<Mojo::Promise> object instead of accepting a callback.
$db->select_p(some_table => ['foo'] => {bar => 'yada'})->then(sub {
my $results = shift;
...
})->catch(sub {
my $err = shift;
...
})->wait;
=head2 tables
my $tables = $db->tables;
Return table and view names for this database, that are visible to the current
user and not internal, as an array reference.
# Names of all tables
say for @{$db->tables};
=head2 unlisten
$db = $db->unlisten('foo');
$db = $db->unlisten('*');
Unsubscribe from a channel, C<*> can be used to unsubscribe from all channels.
=head2 update
my $results = $db->update($table, \%fieldvals, \%where, \%options);
Generate an C<UPDATE> statement with L<Mojo::Pg/"abstract"> (usually an
L<SQL::Abstract> object) and execute it with L</"query">. You can also append a
callback to perform operations non-blocking.
$db->update(some_table => {foo => 'baz'} => {foo => 'bar'} => sub {
my ($db, $err, $results) = @_;
...
});
Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
Use all the same argument variations you would pass to the C<update> method of
L<SQL::Abstract>.
# "update some_table set foo = 'bar' where id = 23"
$db->update('some_table', {foo => 'bar'}, {id => 23});
# "update some_table set foo = {1,2,3} where id = 23"
$db->update('some_table', {foo => [1, 2, 3]}, {id => 23});
# "update some_table set foo = 'bar' where foo like '%test%'"
$db->update('some_table', {foo => 'bar'}, {foo => {-like => '%test%'}});
# "update some_table set foo = 'bar' where id = 23 returning id"
$db->update('some_table', {foo => 'bar'}, {id => 23}, {returning => 'id'});
=head2 update_p
my $promise = $db->update_p($table, \%fieldvals, \%where, \%options);
Same as L</"update">, but performs all operations non-blocking and returns a
L<Mojo::Promise> object instead of accepting a
callback.
$db->update_p(some_table => {foo => 'baz'} => {foo => 'bar'})->then(sub {
my $results = shift;
...
})->catch(sub {
my $err = shift;
...
})->wait;
=head1 SEE ALSO
L<Mojo::Pg>, L<Mojolicious::Guides>, L<http://mojolicious.org>.
=cut
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