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package DBIx::Class::Storage::DBI::Cursor;
use base qw/DBIx::Class::Cursor/;
use strict;
use warnings;
=head1 NAME
DBIx::Class::Storage::DBI::Cursor - Object representing a query cursor on a
resultset.
=head1 SYNOPSIS
my $cursor = $schema->resultset('CD')->cursor();
my $first_cd = $cursor->next;
=head1 DESCRIPTION
A Cursor represents a query cursor on a L<DBIx::Class::ResultSet> object. It
allows for traversing the result set with L</next>, retrieving all results with
L</all> and resetting the cursor with L</reset>.
Usually, you would use the cursor methods built into L<DBIx::Class::ResultSet>
to traverse it. See L<DBIx::Class::ResultSet/next>,
L<DBIx::Class::ResultSet/reset> and L<DBIx::Class::ResultSet/all> for more
information.
=head1 METHODS
=head2 new
Returns a new L<DBIx::Class::Storage::DBI::Cursor> object.
=cut
sub new {
my ($class, $storage, $args, $attrs) = @_;
#use Data::Dumper; warn Dumper(@_);
$class = ref $class if ref $class;
my $new = {
storage => $storage,
args => $args,
pos => 0,
attrs => $attrs,
pid => $$,
};
$new->{tid} = threads->tid if $INC{'threads.pm'};
return bless ($new, $class);
}
=head2 next
=over 4
=item Arguments: none
=item Return Value: \@row_columns
=back
Advances the cursor to the next row and returns an arrayref of column values.
=cut
sub next {
my ($self) = @_;
$self->_check_forks_threads;
if ($self->{attrs}{rows} && $self->{pos} >= $self->{attrs}{rows}) {
$self->{sth}->finish if $self->{sth}->{Active};
delete $self->{sth};
$self->{done} = 1;
}
return if $self->{done};
unless ($self->{sth}) {
$self->{sth} = ($self->{storage}->_select(@{$self->{args}}))[1];
if ($self->{attrs}{software_limit}) {
if (my $offset = $self->{attrs}{offset}) {
$self->{sth}->fetch for 1 .. $offset;
}
}
}
my @row = $self->{sth}->fetchrow_array;
if (@row) {
$self->{pos}++;
} else {
delete $self->{sth};
$self->{done} = 1;
}
return @row;
}
=head2 all
=over 4
=item Arguments: none
=item Return Value: \@row_columns+
=back
Returns a list of arrayrefs of column values for all rows in the
L<DBIx::Class::ResultSet>.
=cut
sub all {
my ($self) = @_;
$self->_check_forks_threads;
return $self->SUPER::all if $self->{attrs}{rows};
$self->{sth}->finish if $self->{sth}->{Active};
delete $self->{sth};
my ($rv, $sth) = $self->{storage}->_select(@{$self->{args}});
return @{$sth->fetchall_arrayref};
}
=head2 reset
Resets the cursor to the beginning of the L<DBIx::Class::ResultSet>.
=cut
sub reset {
my ($self) = @_;
$self->_check_forks_threads;
$self->{sth}->finish if $self->{sth}->{Active};
$self->_soft_reset;
}
sub _soft_reset {
my ($self) = @_;
delete $self->{sth};
$self->{pos} = 0;
delete $self->{done};
return $self;
}
sub _check_forks_threads {
my ($self) = @_;
if($INC{'threads.pm'} && $self->{tid} != threads->tid) {
$self->_soft_reset;
$self->{tid} = threads->tid;
}
if($self->{pid} != $$) {
$self->_soft_reset;
$self->{pid} = $$;
}
}
sub DESTROY {
my ($self) = @_;
$self->_check_forks_threads;
$self->{sth}->finish if $self->{sth} && $self->{sth}->{Active};
}
1;
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