release 0.08123

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Cursor.pm

diff --git a/lib/DBIx/Class/Cursor.pm b/lib/DBIx/Class/Cursor.pm
index 52aa9e8..14816ab 100644 (file)
--- a/lib/DBIx/Class/Cursor.pm
+++ b/lib/DBIx/Class/Cursor.pm
@@ -2,98 +2,78 @@ package DBIx::Class::Cursor;
 
 use strict;
 use warnings;
-use overload
-        '0+'     => 'count',
-        fallback => 1;
+
+use base qw/DBIx::Class/;
+
+=head1 NAME
+
+DBIx::Class::Cursor - Abstract 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
+
+Virtual method. Returns a new L<DBIx::Class::Cursor> object.
+
+=cut
 
 sub new {
-  my ($it_class, $db_class, $sth, $args, $cols, $attrs) = @_;
-  #use Data::Dumper; warn Dumper(@_);
-  $it_class = ref $it_class if ref $it_class;
-  unless ($sth) {
-    $sth = $db_class->_get_sth('select', $cols,
-                             $db_class->_table_name, $attrs->{where});
-  }
-  my $new = {
-    class => $db_class,
-    sth => $sth,
-    cols => $cols,
-    args => $args,
-    pos => 0,
-    attrs => $attrs };
-  return bless ($new, $it_class);
+  die "Virtual method!";
 }
 
-sub slice {
-  my ($self, $min, $max) = @_;
-  my $attrs = { %{ $self->{attrs} || {} } };
-  $self->{class}->throw("Can't slice without where") unless $attrs->{where};
-  $attrs->{offset} = $min;
-  $attrs->{rows} = ($max ? ($max - $min + 1) : 1);
-  my $slice = $self->new($self->{class}, undef, $self->{args},
-                           $self->{cols}, $attrs);
-  return (wantarray ? $slice->all : $slice);
-}
+=head2 next
+
+Virtual method. Advances the cursor to the next row. Returns an array of
+column values (the result of L<DBI/fetchrow_array> method).
+
+=cut
 
 sub next {
-  my ($self) = @_;
-  return if $self->{attrs}{rows}
-    && $self->{pos} >= $self->{attrs}{rows}; # + $self->{attrs}{offset});
-  unless ($self->{live_sth}) {
-    $self->{sth}->execute(@{$self->{args} || []});
-    if (my $offset = $self->{attrs}{offset}) {
-      $self->{sth}->fetchrow_array for 1 .. $offset;
-    }
-    $self->{live_sth} = 1;
-  }
-  my @row = $self->{sth}->fetchrow_array;
-  return unless (@row);
-  $self->{pos}++;
-  return $self->{class}->_row_to_object($self->{cols}, \@row);
+  die "Virtual method!";
 }
 
-sub count {
-  my ($self) = @_;
-  return $self->{attrs}{rows} if $self->{attrs}{rows};
-  if (my $cond = $self->{attrs}->{where}) {
-    my $class = $self->{class};
-    my $sth = $class->_get_sth( 'select', [ 'COUNT(*)' ],
-                                  $class->_table_name, $cond);
-    my ($count) = $class->_get_dbh->selectrow_array(
-                                      $sth, undef, @{$self->{args} || []});
-    return $count;
-  } else {
-    return scalar $_[0]->all; # So inefficient
-  }
+=head2 reset
+
+Virtual method. Resets the cursor to the beginning.
+
+=cut
+
+sub reset {
+  die "Virtual method!";
 }
 
+=head2 all
+
+Virtual method. Returns all rows in the L<DBIx::Class::ResultSet>.
+
+=cut
+
 sub all {
   my ($self) = @_;
   $self->reset;
   my @all;
-  while (my $obj = $self->next) {
-    push(@all, $obj);
+  while (my @row = $self->next) {
+    push(@all, \@row);
   }
   $self->reset;
   return @all;
 }
 
-sub reset {
-  my ($self) = @_;
-  $self->{sth}->finish if $self->{sth}->{Active};
-  $self->{pos} = 0;
-  $self->{live_sth} = 0;
-  return $self;
-}
-
-sub first {
-  return $_[0]->reset->next;
-}
-
-sub delete_all {
-  my ($self) = @_;
-  $_->delete for $self->all;
-  return 1;
-}
-
 1;