1 package SQL::Translator::Schema::Trigger;
3 # ----------------------------------------------------------------------
4 # $Id: Trigger.pm 1444 2009-02-07 15:53:56Z ashberlin $
5 # ----------------------------------------------------------------------
6 # Copyright (C) 2002-2009 SQLFairy Authors
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License as
10 # published by the Free Software Foundation; version 2.
12 # This program is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 # General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 # -------------------------------------------------------------------
27 SQL::Translator::Schema::Trigger - SQL::Translator trigger object
31 use SQL::Translator::Schema::Trigger;
32 my $trigger = SQL::Translator::Schema::Trigger->new(
34 perform_action_when => 'before', # or after
35 database_event => 'insert', # Obsolete please use database_events!
36 database_events => [qw/update instert/], # or update, update_on, delete
37 fields => [], # fields if event is "update"
38 on_table => 'foo', # table name
39 action => '...', # text of trigger
40 schema => $schema, # Schema object
45 C<SQL::Translator::Schema::Trigger> is the trigger object.
52 use SQL::Translator::Utils 'parse_list_arg';
54 use base 'SQL::Translator::Schema::Object';
58 use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT);
62 # ----------------------------------------------------------------------
64 __PACKAGE__->_attributes( qw/
65 name schema perform_action_when database_event database_events fields table on_table action
75 my $schema = SQL::Translator::Schema::Trigger->new;
79 # ----------------------------------------------------------------------
80 sub perform_action_when {
84 =head2 perform_action_when
86 Gets or sets whether the event happens "before" or "after" the
89 $trigger->perform_action_when('after');
95 if ( my $arg = shift ) {
98 if ( $arg =~ m/^(before|after)$/i ) {
99 $self->{'perform_action_when'} = $arg;
103 $self->error("Invalid argument '$arg' to perform_action_when");
107 return $self->{'perform_action_when'};
110 # ----------------------------------------------------------------------
115 =head2 database_event
117 Obosolete please use database_events!
124 if ( my $arg = shift ) {
125 $self->database_events( [$arg] );
128 return $self->error("Please use database_events the trigger has more then one events!")
129 if (scalar @{$self->{'database_events'}} > 1);
131 carp 'database_event is obsolete please use database_events';
132 return (@{ $self->{'database_events'} })[0];
134 # ----------------------------------------------------------------------
135 sub database_events {
139 =head2 database_events
141 Gets or sets the events that triggers the trigger.
143 my $ok = $trigger->database_events('insert');
149 if ( my $arg = shift ) {
150 if (ref $arg eq "ARRAY"){
154 return $self->error("Invalid event '$_' in database_events") unless ( $_ =~ /^(insert|update|update_on|delete)$/ );
156 @{ $self->{'database_events'} } = @$arg;
159 return $self->error("Invalid argument to database_events");
164 return $self->{'database_events'};
167 # ----------------------------------------------------------------------
174 Gets and set which fields to monitor for C<database_event>.
177 $view->fields('id', 'name');
178 $view->fields( 'id, name' );
179 $view->fields( [ 'id', 'name' ] );
180 $view->fields( qw[ id name ] );
182 my @fields = $view->fields;
187 my $fields = parse_list_arg( @_ );
190 my ( %unique, @unique );
191 for my $f ( @$fields ) {
192 next if $unique{ $f };
197 $self->{'fields'} = \@unique;
200 return wantarray ? @{ $self->{'fields'} || [] } : $self->{'fields'};
203 # ----------------------------------------------------------------------
210 Gets or set the table on which the trigger works, as a L<SQL::Translator::Schema::Table> object.
211 $trigger->table($triggered_table);
215 my ($self, $arg) = @_;
217 $self->error("Table attribute of a ".__PACKAGE__.
218 " must be a SQL::Translator::Schema::Table")
219 unless ref $arg and $arg->isa('SQL::Translator::Schema::Table');
220 $self->{table} = $arg;
222 return $self->{table};
225 # ----------------------------------------------------------------------
232 Gets or set the table name on which the trigger works, as a string.
233 $trigger->on_table('foo');
237 my ($self, $arg) = @_;
239 my $table = $self->schema->get_table($arg);
240 die "Table named $arg doesn't exist"
242 $self->table($table);
244 return $self->table->name;
247 # ----------------------------------------------------------------------
254 Gets or set the actions of the trigger.
268 my $arg = shift || '';
269 $self->{'action'} = $arg if $arg;
270 return $self->{'action'};
273 # ----------------------------------------------------------------------
280 Determine whether the trigger is valid or not.
282 my $ok = $trigger->is_valid;
289 qw[ name perform_action_when database_event on_table action ]
291 return $self->error("No $attr") unless $self->$attr();
294 return $self->error("Missing fields for UPDATE ON") if
295 $self->database_event eq 'update_on' && !$self->fields;
300 # ----------------------------------------------------------------------
307 Get or set the trigger's name.
309 my $name = $trigger->name('foo');
314 $self->{'name'} = shift if @_;
315 return $self->{'name'} || '';
318 # ----------------------------------------------------------------------
325 Get or set the trigger's order.
327 my $order = $trigger->order(3);
331 my ( $self, $arg ) = @_;
333 if ( defined $arg && $arg =~ /^\d+$/ ) {
334 $self->{'order'} = $arg;
337 return $self->{'order'} || 0;
340 # ----------------------------------------------------------------------
347 Get or set the trigger's schema object.
349 $trigger->schema( $schema );
350 my $schema = $trigger->schema;
355 if ( my $arg = shift ) {
356 return $self->error('Not a schema object') unless
357 UNIVERSAL::isa( $arg, 'SQL::Translator::Schema' );
358 $self->{'schema'} = $arg;
361 return $self->{'schema'};
364 # ----------------------------------------------------------------------
369 =head2 compare_arrays
375 my ($first, $second) = @_;
376 no warnings; # silence spurious -w undef complaints
378 return 0 unless (ref $first eq 'ARRAY' and ref $second eq 'ARRAY' ) ;
379 return 0 unless @$first == @$second;
380 my @first = sort @$first;
381 my @second = sort @$second;
382 for (my $i = 0; $i < scalar @first; $i++) {
383 return 0 if @first[$i] ne @second[$i];
388 # ----------------------------------------------------------------------
395 Determines if this trigger is the same as another
397 my $isIdentical = $trigger1->equals( $trigger2 );
403 my $case_insensitive = shift;
405 return 0 unless $self->SUPER::equals($other);
406 return 0 unless $case_insensitive ? uc($self->name) eq uc($other->name) : $self->name eq $other->name;
407 #return 0 unless $self->is_valid eq $other->is_valid;
408 return 0 unless $self->perform_action_when eq $other->perform_action_when;
409 return 0 unless compare_arrays($self->database_events,$other->database_events) ;
410 return 0 unless $self->on_table eq $other->on_table;
411 return 0 unless $self->action eq $other->action;
412 return 0 unless $self->_compare_objects(scalar $self->extra, scalar $other->extra);
416 # ----------------------------------------------------------------------
419 undef $self->{'schema'}; # destroy cyclical reference
424 # ----------------------------------------------------------------------
430 Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.