1Class::DBI::Cascade::NoUnsee(r3)Contributed Perl DocumenCtlaatsiso:n:DBI::Cascade::None(3)
2
3
4

NAME

6       Class::DBI::Cascade::None - Do nothing upon deletion
7

DESCRIPTION

9       This is a Cascading Delete strategy that will do nothing, leaving
10       orphaned records behind.
11
12       It is the base class for most ofther Cascade strategies, and so
13       provides several important methods:
14

CONSTRUCTOR

16   new
17               my $strategy = Cascade::Class->new($Relationship);
18
19       This must be instantiated with a Class::DBI::Relationship object.
20

METHODS

22   foreign_for
23               my $iterator = $strategy->foreign_for($obj);
24
25       This will return all the objects which are foreign to $obj across the
26       relationship. It's a normal Class::DBI search you can get the results
27       either as a list or as an iterator.
28
29   cascade
30               $strategy->cascade($obj);
31
32       Cascade across the related objects to $obj.
33

WRITING NEW STRATEGIES

35       Creating a Cascade strategy should be fairly simple. You usually just
36       need to inherit from here, and then supply a cascade() method that does
37       the required thing with the results from foreign_for().
38
39       So, for example, Cascade::Delete is implemented simply as:
40
41               package Class::DBI::Cascade::Delete;
42
43               use base 'Class::DBI::Cascade::None';
44
45               sub cascade {
46                       my ($self, $obj) = @_;
47                       $self->foreign_for($obj)->delete_all;
48               }
49
50
51
52perl v5.28.0                      2005-09-14      Class::DBI::Cascade::None(3)
Impressum