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package Rose::DB::Object::Iterator; |
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3
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61
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444
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use strict; |
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130
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1748
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use Carp(); |
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61
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879
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61
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use Rose::Object; |
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4493
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our @ISA = qw(Rose::Object); |
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our $VERSION = '0.759'; |
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use Rose::Object::MakeMethods::Generic |
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( |
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61
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scalar => |
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[ |
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'error', |
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'_count', |
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'_next_code', |
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'_finish_code', |
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'_destroy_code', |
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], |
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'boolean' => 'active', |
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61
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1087
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); |
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61
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9002
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sub next |
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{ |
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0
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1
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my($self) = shift; |
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0
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my $ret = $self->_next_code->($self, @_); |
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0
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$self->active(0) unless($ret); |
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0
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return $ret; |
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} |
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sub finish |
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{ |
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my($self) = shift; |
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0
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$self->active(0); |
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0
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$self->_next_code(sub { 0 }); |
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0
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0
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return $self->_finish_code->($self, @_); |
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} |
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sub DESTROY |
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{ |
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0
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my($self) = shift; |
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0
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0
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if($self->active) |
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0
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{ |
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0
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$self->finish; |
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} |
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elsif(my $code = $self->_destroy_code) |
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{ |
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0
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$code->($self); |
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} |
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} |
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56
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0
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0
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1
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sub total { shift->{'_count'} } |
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58
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1; |
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60
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__END__ |
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61
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62
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=head1 NAME |
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63
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64
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Rose::DB::Object::Iterator - Iterate over a series of Rose::DB::Objects. |
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65
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66
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=head1 SYNOPSIS |
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67
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68
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$iterator = Rose::DB::Object::Manager->get_objects_iterator(...); |
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69
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70
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while($object = $iterator->next) |
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71
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{ |
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72
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# do stuff with $object... |
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73
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74
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if(...) # bail out early |
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75
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{ |
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76
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$iterator->finish; |
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77
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last; |
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78
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} |
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79
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} |
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80
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81
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if($iterator->error) |
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82
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{ |
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83
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print "There was an error: ", $iterator->error; |
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84
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} |
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85
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else |
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86
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{ |
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87
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print "Total: ", $iterator->total; |
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88
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} |
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89
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90
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=head1 DESCRIPTION |
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91
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92
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L<Rose::DB::Object::Iterator> is an iterator object that traverses a database query, returning L<Rose::DB::Object>-derived objects for each row. L<Rose::DB::Object::Iterator> objects are created by calls to the L<get_objects_iterator|Rose::DB::Object::Manager/get_objects_iterator> method of L<Rose::DB::Object::Manager> or one of its subclasses. |
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93
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94
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=head1 OBJECT METHODS |
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95
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96
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=over 4 |
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97
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98
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=item B<error> |
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99
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100
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Returns the text message associated with the last error, or false if there was no error. |
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101
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102
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=item B<finish> |
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103
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104
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Prematurely stop the iteration (i.e., before iterating over all of the available objects). |
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105
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106
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=item B<next> |
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107
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108
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Return the next L<Rose::DB::Object>-derived object. Returns false (but defined) if there are no more objects to iterate over, or undef if there was an error. |
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109
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110
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=item B<total> |
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111
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112
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Returns the total number of objects iterated over so far. |
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113
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114
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=back |
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115
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116
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=head1 AUTHOR |
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117
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118
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John C. Siracusa (siracusa@gmail.com) |
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119
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120
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=head1 LICENSE |
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121
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122
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Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is |
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123
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free software; you can redistribute it and/or modify it under the same terms |
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124
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as Perl itself. |