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1 | package SQL::Translator::Schema::Trigger; |
2 | |
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3 | =pod |
4 | |
5 | =head1 NAME |
6 | |
7 | SQL::Translator::Schema::Trigger - SQL::Translator trigger object |
8 | |
9 | =head1 SYNOPSIS |
10 | |
11 | use SQL::Translator::Schema::Trigger; |
12 | my $trigger = SQL::Translator::Schema::Trigger->new( |
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13 | name => 'foo', |
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 |
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20 | scope => 'row', # or statement |
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21 | ); |
22 | |
23 | =head1 DESCRIPTION |
24 | |
25 | C<SQL::Translator::Schema::Trigger> is the trigger object. |
26 | |
27 | =head1 METHODS |
28 | |
29 | =cut |
30 | |
90097ddd |
31 | use Moo; |
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32 | use SQL::Translator::Utils qw(parse_list_arg ex2err throw uniq); |
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33 | use SQL::Translator::Types qw(schema_obj enum); |
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34 | use Sub::Quote qw(quote_sub); |
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35 | |
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36 | extends 'SQL::Translator::Schema::Object'; |
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37 | |
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38 | our $VERSION = '1.62'; |
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39 | |
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40 | =head2 new |
41 | |
42 | Object constructor. |
43 | |
44 | my $schema = SQL::Translator::Schema::Trigger->new; |
45 | |
46 | =cut |
47 | |
da0136cd |
48 | around BUILDARGS => sub { |
49 | my ($orig, $self, @args) = @_; |
50 | my $args = $self->$orig(@args); |
51 | if (exists $args->{on_table}) { |
52 | my $arg = delete $args->{on_table}; |
53 | my $table = $args->{schema}->get_table($arg) |
54 | or die "Table named $arg doesn't exist"; |
55 | $args->{table} = $table; |
56 | } |
57 | if (exists $args->{database_event}) { |
58 | $args->{database_events} = delete $args->{database_event}; |
59 | } |
60 | return $args; |
61 | }; |
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62 | |
63 | =head2 perform_action_when |
64 | |
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65 | Gets or sets whether the event happens "before" or "after" the |
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66 | C<database_event>. |
67 | |
68 | $trigger->perform_action_when('after'); |
69 | |
70 | =cut |
71 | |
da0136cd |
72 | has perform_action_when => ( |
73 | is => 'rw', |
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74 | coerce => quote_sub(q{ defined $_[0] ? lc $_[0] : $_[0] }), |
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75 | isa => enum([qw(before after)], { |
76 | msg => "Invalid argument '%s' to perform_action_when", |
77 | allow_undef => 1, |
78 | }), |
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79 | ); |
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80 | |
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81 | around perform_action_when => \&ex2err; |
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82 | |
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83 | sub database_event { |
84 | |
85 | =pod |
86 | |
87 | =head2 database_event |
88 | |
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89 | Obsolete please use database_events! |
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90 | |
91 | =cut |
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92 | |
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93 | my $self = shift; |
94 | |
95 | return $self->database_events( @_ ); |
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96 | } |
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97 | |
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98 | =head2 database_events |
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99 | |
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100 | Gets or sets the events that triggers the trigger. |
101 | |
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102 | my $ok = $trigger->database_events('insert'); |
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103 | |
104 | =cut |
105 | |
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106 | has database_events => ( |
107 | is => 'rw', |
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108 | coerce => quote_sub(q{ [ map { lc } ref $_[0] eq 'ARRAY' ? @{$_[0]} : ($_[0]) ] }), |
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109 | isa => sub { |
110 | my @args = @{$_[0]}; |
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111 | my %valid = map { $_, 1 } qw[ insert update update_on delete ]; |
112 | my @invalid = grep { !defined $valid{ $_ } } @args; |
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113 | |
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114 | if ( @invalid ) { |
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115 | throw( |
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116 | sprintf("Invalid events '%s' in database_events", |
117 | join(', ', @invalid) |
118 | ) |
119 | ); |
120 | } |
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121 | }, |
122 | ); |
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123 | |
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124 | around database_events => sub { |
125 | my ($orig,$self) = (shift, shift); |
126 | |
127 | if (@_) { |
128 | ex2err($orig, $self, ref $_[0] eq 'ARRAY' ? $_[0] : \@_) |
129 | or return; |
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130 | } |
131 | |
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132 | return wantarray |
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133 | ? @{ $self->$orig || [] } |
134 | : $self->$orig; |
135 | }; |
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136 | |
137 | =head2 fields |
138 | |
139 | Gets and set which fields to monitor for C<database_event>. |
140 | |
141 | $view->fields('id'); |
142 | $view->fields('id', 'name'); |
143 | $view->fields( 'id, name' ); |
144 | $view->fields( [ 'id', 'name' ] ); |
145 | $view->fields( qw[ id name ] ); |
146 | |
147 | my @fields = $view->fields; |
148 | |
149 | =cut |
150 | |
da0136cd |
151 | has fields => ( |
152 | is => 'rw', |
153 | coerce => sub { |
154 | my @fields = uniq @{parse_list_arg($_[0])}; |
155 | @fields ? \@fields : undef; |
156 | }, |
157 | ); |
158 | |
159 | around fields => sub { |
160 | my $orig = shift; |
161 | my $self = shift; |
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162 | my $fields = parse_list_arg( @_ ); |
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163 | $self->$orig($fields) if @$fields; |
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164 | |
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165 | return wantarray ? @{ $self->$orig || [] } : $self->$orig; |
166 | }; |
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167 | |
168 | =head2 table |
169 | |
170 | Gets or set the table on which the trigger works, as a L<SQL::Translator::Schema::Table> object. |
171 | $trigger->table($triggered_table); |
172 | |
173 | =cut |
174 | |
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175 | has table => ( is => 'rw', isa => schema_obj('Table'), weak_ref => 1 ); |
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176 | |
177 | around table => \&ex2err; |
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178 | |
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179 | sub on_table { |
180 | |
181 | =pod |
182 | |
183 | =head2 on_table |
184 | |
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185 | Gets or set the table name on which the trigger works, as a string. |
186 | $trigger->on_table('foo'); |
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187 | |
188 | =cut |
189 | |
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190 | my ($self, $arg) = @_; |
191 | if ( @_ == 2 ) { |
192 | my $table = $self->schema->get_table($arg); |
193 | die "Table named $arg doesn't exist" |
194 | if !$table; |
195 | $self->table($table); |
196 | } |
197 | return $self->table->name; |
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198 | } |
199 | |
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200 | =head2 action |
201 | |
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202 | Gets or set the action of the trigger. |
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203 | |
cb490ce5 |
204 | $trigger->action( |
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205 | q[ |
206 | BEGIN |
207 | select ...; |
208 | update ...; |
209 | END |
210 | ] |
211 | ); |
212 | |
213 | =cut |
214 | |
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215 | has action => ( is => 'rw', default => quote_sub(q{ '' }) ); |
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216 | |
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217 | sub is_valid { |
218 | |
219 | =pod |
220 | |
221 | =head2 is_valid |
222 | |
223 | Determine whether the trigger is valid or not. |
224 | |
225 | my $ok = $trigger->is_valid; |
226 | |
227 | =cut |
228 | |
229 | my $self = shift; |
230 | |
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231 | for my $attr ( |
232 | qw[ name perform_action_when database_events on_table action ] |
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233 | ) { |
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234 | return $self->error("Invalid: missing '$attr'") unless $self->$attr(); |
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235 | } |
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236 | |
237 | return $self->error("Missing fields for UPDATE ON") if |
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238 | $self->database_event eq 'update_on' && !$self->fields; |
239 | |
240 | return 1; |
241 | } |
242 | |
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243 | =head2 name |
244 | |
245 | Get or set the trigger's name. |
246 | |
247 | my $name = $trigger->name('foo'); |
248 | |
249 | =cut |
250 | |
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251 | has name => ( is => 'rw', default => quote_sub(q{ '' }) ); |
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252 | |
253 | =head2 order |
254 | |
255 | Get or set the trigger's order. |
256 | |
257 | my $order = $trigger->order(3); |
258 | |
259 | =cut |
260 | |
68d75205 |
261 | has order => ( is => 'rw', default => quote_sub(q{ 0 }) ); |
da0136cd |
262 | |
263 | around order => sub { |
264 | my ( $orig, $self, $arg ) = @_; |
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265 | |
266 | if ( defined $arg && $arg =~ /^\d+$/ ) { |
da0136cd |
267 | return $self->$orig($arg); |
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268 | } |
269 | |
da0136cd |
270 | return $self->$orig; |
271 | }; |
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272 | |
273 | =head2 scope |
274 | |
275 | Get or set the trigger's scope (row or statement). |
276 | |
277 | my $scope = $trigger->scope('statement'); |
278 | |
279 | =cut |
280 | |
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281 | has scope => ( |
282 | is => 'rw', |
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283 | isa => enum([qw(row statement)], { |
284 | msg => "Invalid scope '%s'", icase => 1, allow_undef => 1, |
285 | }), |
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286 | ); |
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287 | |
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288 | around scope => \&ex2err; |
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289 | |
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290 | |
291 | =head2 schema |
292 | |
293 | Get or set the trigger's schema object. |
294 | |
295 | $trigger->schema( $schema ); |
296 | my $schema = $trigger->schema; |
297 | |
298 | =cut |
299 | |
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300 | has schema => (is => 'rw', isa => schema_obj('Schema'), weak_ref => 1 ); |
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301 | |
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302 | around schema => \&ex2err; |
39ad1787 |
303 | |
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304 | sub compare_arrays { |
305 | |
306 | =pod |
307 | |
308 | =head2 compare_arrays |
309 | |
310 | Compare two arrays. |
311 | |
312 | =cut |
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313 | |
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314 | my ($first, $second) = @_; |
315 | no warnings; # silence spurious -w undef complaints |
316 | |
317 | return 0 unless (ref $first eq 'ARRAY' and ref $second eq 'ARRAY' ) ; |
318 | |
319 | return 0 unless @$first == @$second; |
320 | |
321 | my @first = sort @$first; |
322 | |
323 | my @second = sort @$second; |
324 | |
325 | for (my $i = 0; $i < scalar @first; $i++) { |
326 | return 0 if @first[$i] ne @second[$i]; |
327 | } |
328 | |
329 | return 1; |
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330 | } |
331 | |
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332 | =head2 equals |
333 | |
334 | Determines if this trigger is the same as another |
335 | |
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336 | my $is_identical = $trigger1->equals( $trigger2 ); |
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337 | |
338 | =cut |
339 | |
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340 | around equals => sub { |
341 | my $orig = shift; |
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342 | my $self = shift; |
343 | my $other = shift; |
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344 | my $case_insensitive = shift; |
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345 | |
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346 | return 0 unless $self->$orig($other); |
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347 | |
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348 | my %names; |
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349 | for my $name ( $self->name, $other->name ) { |
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350 | $name = lc $name if $case_insensitive; |
351 | $names{ $name }++; |
352 | } |
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353 | |
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354 | if ( keys %names > 1 ) { |
355 | return $self->error('Names not equal'); |
356 | } |
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357 | |
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358 | if ( !$self->perform_action_when eq $other->perform_action_when ) { |
359 | return $self->error('perform_action_when differs'); |
360 | } |
361 | |
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362 | if ( |
363 | !compare_arrays( [$self->database_events], [$other->database_events] ) |
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364 | ) { |
365 | return $self->error('database_events differ'); |
366 | } |
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367 | |
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368 | if ( $self->on_table ne $other->on_table ) { |
369 | return $self->error('on_table differs'); |
370 | } |
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371 | |
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372 | if ( $self->action ne $other->action ) { |
373 | return $self->error('action differs'); |
374 | } |
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375 | |
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376 | if ( |
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377 | !$self->_compare_objects( scalar $self->extra, scalar $other->extra ) |
378 | ) { |
379 | return $self->error('extras differ'); |
380 | } |
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381 | |
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382 | return 1; |
da0136cd |
383 | }; |
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384 | |
da0136cd |
385 | # Must come after all 'has' declarations |
386 | around new => \&ex2err; |
387 | |
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388 | 1; |
389 | |
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390 | =pod |
391 | |
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392 | =head1 AUTHORS |
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393 | |
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394 | Anonymous, |
395 | Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>. |
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396 | |
397 | =cut |