1 package SQL::Translator::Schema::Trigger;
7 SQL::Translator::Schema::Trigger - SQL::Translator trigger object
11 use SQL::Translator::Schema::Trigger;
12 my $trigger = SQL::Translator::Schema::Trigger->new(
14 perform_action_when => 'before', # or after
15 database_events => [qw/update insert/], # also update, update_on, delete
16 fields => [], # if event is "update"
17 on_table => 'foo', # table name
18 action => '...', # text of trigger
19 schema => $schema, # Schema object
24 C<SQL::Translator::Schema::Trigger> is the trigger object.
31 use SQL::Translator::Utils 'parse_list_arg';
33 use base 'SQL::Translator::Schema::Object';
37 use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT);
41 __PACKAGE__->_attributes( qw/
42 name schema perform_action_when database_events database_event
43 fields table on_table action order
52 my $schema = SQL::Translator::Schema::Trigger->new;
56 sub perform_action_when {
60 =head2 perform_action_when
62 Gets or sets whether the event happens "before" or "after" the
65 $trigger->perform_action_when('after');
71 if ( my $arg = shift ) {
74 if ( $arg =~ m/^(before|after)$/i ) {
75 $self->{'perform_action_when'} = $arg;
79 $self->error("Invalid argument '$arg' to perform_action_when");
83 return $self->{'perform_action_when'};
92 Obsolete please use database_events!
98 return $self->database_events( @_ );
101 sub database_events {
105 =head2 database_events
107 Gets or sets the events that triggers the trigger.
109 my $ok = $trigger->database_events('insert');
114 my @args = ref $_[0] eq 'ARRAY' ? @{ $_[0] } : @_;
117 @args = map { s/\s+/ /g; lc $_ } @args;
118 my %valid = map { $_, 1 } qw[ insert update update_on delete ];
119 my @invalid = grep { !defined $valid{ $_ } } @args;
123 sprintf("Invalid events '%s' in database_events",
129 $self->{'database_events'} = [ @args ];
133 ? @{ $self->{'database_events'} || [] }
134 : $self->{'database_events'};
143 Gets and set which fields to monitor for C<database_event>.
146 $view->fields('id', 'name');
147 $view->fields( 'id, name' );
148 $view->fields( [ 'id', 'name' ] );
149 $view->fields( qw[ id name ] );
151 my @fields = $view->fields;
156 my $fields = parse_list_arg( @_ );
159 my ( %unique, @unique );
160 for my $f ( @$fields ) {
161 next if $unique{ $f };
166 $self->{'fields'} = \@unique;
169 return wantarray ? @{ $self->{'fields'} || [] } : $self->{'fields'};
178 Gets or set the table on which the trigger works, as a L<SQL::Translator::Schema::Table> object.
179 $trigger->table($triggered_table);
183 my ($self, $arg) = @_;
185 $self->error("Table attribute of a ".__PACKAGE__.
186 " must be a SQL::Translator::Schema::Table")
187 unless ref $arg and $arg->isa('SQL::Translator::Schema::Table');
188 $self->{table} = $arg;
190 return $self->{table};
199 Gets or set the table name on which the trigger works, as a string.
200 $trigger->on_table('foo');
204 my ($self, $arg) = @_;
206 my $table = $self->schema->get_table($arg);
207 die "Table named $arg doesn't exist"
209 $self->table($table);
211 return $self->table->name;
220 Gets or set the action of the trigger.
234 my $arg = shift || '';
235 $self->{'action'} = $arg if $arg;
236 return $self->{'action'};
245 Determine whether the trigger is valid or not.
247 my $ok = $trigger->is_valid;
254 qw[ name perform_action_when database_events on_table action ]
256 return $self->error("Invalid: missing '$attr'") unless $self->$attr();
259 return $self->error("Missing fields for UPDATE ON") if
260 $self->database_event eq 'update_on' && !$self->fields;
271 Get or set the trigger's name.
273 my $name = $trigger->name('foo');
278 $self->{'name'} = shift if @_;
279 return $self->{'name'} || '';
288 Get or set the trigger's order.
290 my $order = $trigger->order(3);
294 my ( $self, $arg ) = @_;
296 if ( defined $arg && $arg =~ /^\d+$/ ) {
297 $self->{'order'} = $arg;
300 return $self->{'order'} || 0;
309 Get or set the trigger's schema object.
311 $trigger->schema( $schema );
312 my $schema = $trigger->schema;
317 if ( my $arg = shift ) {
318 return $self->error('Not a schema object') unless
319 UNIVERSAL::isa( $arg, 'SQL::Translator::Schema' );
320 $self->{'schema'} = $arg;
323 return $self->{'schema'};
330 =head2 compare_arrays
336 my ($first, $second) = @_;
337 no warnings; # silence spurious -w undef complaints
339 return 0 unless (ref $first eq 'ARRAY' and ref $second eq 'ARRAY' ) ;
341 return 0 unless @$first == @$second;
343 my @first = sort @$first;
345 my @second = sort @$second;
347 for (my $i = 0; $i < scalar @first; $i++) {
348 return 0 if @first[$i] ne @second[$i];
360 Determines if this trigger is the same as another
362 my $is_identical = $trigger1->equals( $trigger2 );
368 my $case_insensitive = shift;
370 return 0 unless $self->SUPER::equals($other);
373 for my $name ( $self->name, $other->name ) {
374 $name = lc $name if $case_insensitive;
378 if ( keys %names > 1 ) {
379 return $self->error('Names not equal');
382 if ( !$self->perform_action_when eq $other->perform_action_when ) {
383 return $self->error('perform_action_when differs');
387 !compare_arrays( [$self->database_events], [$other->database_events] )
389 return $self->error('database_events differ');
392 if ( $self->on_table ne $other->on_table ) {
393 return $self->error('on_table differs');
396 if ( $self->action ne $other->action ) {
397 return $self->error('action differs');
401 !$self->_compare_objects( scalar $self->extra, scalar $other->extra )
403 return $self->error('extras differ');
411 undef $self->{'schema'}; # destroy cyclical reference
421 Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>.