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Iterator.pm
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Iterator.pm
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# Copyright (C) Matthew R. Laird
# Author [email protected]
# This file is part of MicrobeDB
#MicrobeDB is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#MicrobeDB is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.
#You should have received a copy of the GNU General Public License
#along with MicrobeDB. If not, see <http://www.gnu.org/licenses/>.
package MicrobeDB::Iterator;
# This class contains an iterator object for use with
# MicrobeDB::Search. Some search results are too large
# to return as a single object so the iterator class
# gives access to the results row-by-row.
#inherit common methods and fields from the MicroDB class
use base ("MicrobeDB::MicrobeDB");
use strict;
use warnings;
use Carp;
my @FIELDS;
BEGIN {
@FIELDS = qw(
ret_obj
dbh_obj
);
}
use fields @FIELDS;
sub new {
my ($class, %arg) = @_;
# bless and restruct the object
my $self = fields::new($class);
foreach my $attr ( keys(%arg) ) {
#set the attribute in the object
$self->$attr( $arg{$attr} );
}
return $self;
}
# Return the next object from the database
sub nextRecord {
my ($self) = @_;
#Extract the results back into objects
{
#temporarily turn off strict
no strict "refs";
if ( my $curr_row = $self->{dbh_obj}->fetchrow_hashref ) {
#Create a object of the return type from the hash
my $obj = $self->{ret_obj}->new(%$curr_row);
return $obj;
}
}
return undef;
}
sub rows {
my ($self) = @_;
return $self->{dbh_obj}->rows;
}