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1 | package SQL::Translator::Schema::Constraint; |
2 | |
3 | # ---------------------------------------------------------------------- |
478f608d |
4 | # Copyright (C) 2002-2009 SQLFairy Authors |
3c5de62a |
5 | # |
6 | # This program is free software; you can redistribute it and/or |
7 | # modify it under the terms of the GNU General Public License as |
8 | # published by the Free Software Foundation; version 2. |
9 | # |
10 | # This program is distributed in the hope that it will be useful, but |
11 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | # General Public License for more details. |
14 | # |
15 | # You should have received a copy of the GNU General Public License |
16 | # along with this program; if not, write to the Free Software |
17 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
18 | # 02111-1307 USA |
19 | # ------------------------------------------------------------------- |
20 | |
21 | =pod |
22 | |
23 | =head1 NAME |
24 | |
25 | SQL::Translator::Schema::Constraint - SQL::Translator constraint object |
26 | |
27 | =head1 SYNOPSIS |
28 | |
29 | use SQL::Translator::Schema::Constraint; |
30 | my $constraint = SQL::Translator::Schema::Constraint->new( |
31 | name => 'foo', |
32 | fields => [ id ], |
43b9dc7a |
33 | type => PRIMARY_KEY, |
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34 | ); |
35 | |
36 | =head1 DESCRIPTION |
37 | |
38 | C<SQL::Translator::Schema::Constraint> is the constraint object. |
39 | |
40 | =head1 METHODS |
41 | |
42 | =cut |
43 | |
44 | use strict; |
43b9dc7a |
45 | use SQL::Translator::Schema::Constants; |
752608d5 |
46 | use SQL::Translator::Utils 'parse_list_arg'; |
3c5de62a |
47 | |
b6a880d1 |
48 | use base 'SQL::Translator::Schema::Object'; |
49 | |
da06ac74 |
50 | use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT); |
51 | |
ba506e52 |
52 | $VERSION = '1.60'; |
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53 | |
695c2da2 |
54 | my %VALID_CONSTRAINT_TYPE = ( |
43b9dc7a |
55 | PRIMARY_KEY, 1, |
56 | UNIQUE, 1, |
57 | CHECK_C, 1, |
58 | FOREIGN_KEY, 1, |
695c2da2 |
59 | NOT_NULL, 1, |
60 | ); |
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61 | |
62 | # ---------------------------------------------------------------------- |
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63 | |
9371be50 |
64 | __PACKAGE__->_attributes( qw/ |
65 | table name type fields reference_fields reference_table |
66 | match_type on_delete on_update expression deferrable |
67 | /); |
68 | |
69 | # Override to remove empty arrays from args. |
70 | # t/14postgres-parser breaks without this. |
71 | sub init { |
72 | |
3c5de62a |
73 | =pod |
74 | |
75 | =head2 new |
76 | |
77 | Object constructor. |
78 | |
79 | my $schema = SQL::Translator::Schema::Constraint->new( |
dedb8f3b |
80 | table => $table, # table to which it belongs |
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81 | type => 'foreign_key', # type of table constraint |
dedb8f3b |
82 | name => 'fk_phone_id', # name of the constraint |
83 | fields => 'phone_id', # field in the referring table |
65157eda |
84 | reference_fields => 'phone_id', # referenced field |
85 | reference_table => 'phone', # referenced table |
3c5de62a |
86 | match_type => 'full', # how to match |
2d034ab4 |
87 | on_delete => 'cascade', # what to do on deletes |
88 | on_update => '', # what to do on updates |
3c5de62a |
89 | ); |
90 | |
91 | =cut |
92 | |
9371be50 |
93 | my $self = shift; |
94 | foreach ( values %{$_[0]} ) { $_ = undef if ref($_) eq "ARRAY" && ! @$_; } |
95 | $self->SUPER::init(@_); |
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96 | } |
97 | |
98 | # ---------------------------------------------------------------------- |
43b9dc7a |
99 | sub deferrable { |
100 | |
101 | =pod |
102 | |
103 | =head2 deferrable |
104 | |
2d034ab4 |
105 | Get or set whether the constraint is deferrable. If not defined, |
43b9dc7a |
106 | then returns "1." The argument is evaluated by Perl for True or |
107 | False, so the following are eqivalent: |
108 | |
109 | $deferrable = $field->deferrable(0); |
110 | $deferrable = $field->deferrable(''); |
111 | $deferrable = $field->deferrable('0'); |
112 | |
113 | =cut |
114 | |
115 | my ( $self, $arg ) = @_; |
116 | |
117 | if ( defined $arg ) { |
118 | $self->{'deferrable'} = $arg ? 1 : 0; |
119 | } |
120 | |
121 | return defined $self->{'deferrable'} ? $self->{'deferrable'} : 1; |
122 | } |
123 | |
124 | # ---------------------------------------------------------------------- |
125 | sub expression { |
126 | |
127 | =pod |
128 | |
129 | =head2 expression |
130 | |
131 | Gets and set the expression used in a CHECK constraint. |
132 | |
133 | my $expression = $constraint->expression('...'); |
134 | |
135 | =cut |
136 | |
137 | my $self = shift; |
138 | |
139 | if ( my $arg = shift ) { |
140 | # check arg here? |
141 | $self->{'expression'} = $arg; |
142 | } |
143 | |
144 | return $self->{'expression'} || ''; |
145 | } |
146 | |
147 | # ---------------------------------------------------------------------- |
148 | sub is_valid { |
149 | |
150 | =pod |
151 | |
152 | =head2 is_valid |
153 | |
154 | Determine whether the constraint is valid or not. |
155 | |
156 | my $ok = $constraint->is_valid; |
157 | |
158 | =cut |
159 | |
160 | my $self = shift; |
161 | my $type = $self->type or return $self->error('No type'); |
162 | my $table = $self->table or return $self->error('No table'); |
163 | my @fields = $self->fields or return $self->error('No fields'); |
164 | my $table_name = $table->name or return $self->error('No table name'); |
165 | |
166 | for my $f ( @fields ) { |
167 | next if $table->get_field( $f ); |
168 | return $self->error( |
169 | "Constraint references non-existent field '$f' ", |
170 | "in table '$table_name'" |
171 | ); |
172 | } |
173 | |
174 | my $schema = $table->schema or return $self->error( |
175 | 'Table ', $table->name, ' has no schema object' |
176 | ); |
177 | |
178 | if ( $type eq FOREIGN_KEY ) { |
179 | return $self->error('Only one field allowed for foreign key') |
180 | if scalar @fields > 1; |
181 | |
182 | my $ref_table_name = $self->reference_table or |
183 | return $self->error('No reference table'); |
184 | |
185 | my $ref_table = $schema->get_table( $ref_table_name ) or |
186 | return $self->error("No table named '$ref_table_name' in schema"); |
187 | |
188 | my @ref_fields = $self->reference_fields or return; |
189 | |
190 | return $self->error('Only one field allowed for foreign key reference') |
191 | if scalar @ref_fields > 1; |
192 | |
193 | for my $ref_field ( @ref_fields ) { |
194 | next if $ref_table->get_field( $ref_field ); |
195 | return $self->error( |
196 | "Constraint from field(s) ", |
197 | join(', ', map {qq['$table_name.$_']} @fields), |
198 | " to non-existent field '$ref_table_name.$ref_field'" |
199 | ); |
200 | } |
201 | } |
202 | elsif ( $type eq CHECK_C ) { |
203 | return $self->error('No expression for CHECK') unless |
204 | $self->expression; |
205 | } |
206 | |
207 | return 1; |
208 | } |
209 | |
210 | # ---------------------------------------------------------------------- |
3c5de62a |
211 | sub fields { |
212 | |
213 | =pod |
214 | |
215 | =head2 fields |
216 | |
43b9dc7a |
217 | Gets and set the fields the constraint is on. Accepts a string, list or |
218 | arrayref; returns an array or array reference. Will unique the field |
219 | names and keep them in order by the first occurrence of a field name. |
220 | |
ac095e5e |
221 | The fields are returned as Field objects if they exist or as plain |
222 | names if not. (If you just want the names and want to avoid the Field's overload |
223 | magic use L<field_names>). |
224 | |
225 | Returns undef or an empty list if the constraint has no fields set. |
226 | |
43b9dc7a |
227 | $constraint->fields('id'); |
228 | $constraint->fields('id', 'name'); |
229 | $constraint->fields( 'id, name' ); |
230 | $constraint->fields( [ 'id', 'name' ] ); |
231 | $constraint->fields( qw[ id name ] ); |
3c5de62a |
232 | |
43b9dc7a |
233 | my @fields = $constraint->fields; |
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234 | |
235 | =cut |
236 | |
237 | my $self = shift; |
752608d5 |
238 | my $fields = parse_list_arg( @_ ); |
3c5de62a |
239 | |
240 | if ( @$fields ) { |
43b9dc7a |
241 | my ( %unique, @unique ); |
242 | for my $f ( @$fields ) { |
243 | next if $unique{ $f }; |
244 | $unique{ $f } = 1; |
245 | push @unique, $f; |
246 | } |
247 | |
248 | $self->{'fields'} = \@unique; |
3c5de62a |
249 | } |
250 | |
53ded04a |
251 | if ( @{ $self->{'fields'} || [] } ) { |
ac095e5e |
252 | # We have to return fields that don't exist on the table as names in |
253 | # case those fields havn't been created yet. |
254 | my @ret = map { |
255 | $self->table->get_field($_) || $_ } @{ $self->{'fields'} }; |
256 | return wantarray ? @ret : \@ret; |
53ded04a |
257 | } |
258 | else { |
259 | return wantarray ? () : undef; |
260 | } |
3c5de62a |
261 | } |
262 | |
ebe49790 |
263 | # ---------------------------------------------------------------------- |
ac095e5e |
264 | sub field_names { |
265 | |
266 | =head2 field_names |
267 | |
268 | Read-only method to return a list or array ref of the field names. Returns undef |
269 | or an empty list if the constraint has no fields set. Usefull if you want to |
270 | avoid the overload magic of the Field objects returned by the fields method. |
271 | |
272 | my @names = $constraint->field_names; |
273 | |
274 | =cut |
275 | |
276 | my $self = shift; |
4598b71c |
277 | return wantarray ? @{ $self->{'fields'} || [] } : ($self->{'fields'} || ''); |
ac095e5e |
278 | } |
279 | |
3c5de62a |
280 | # ---------------------------------------------------------------------- |
752608d5 |
281 | sub match_type { |
282 | |
283 | =pod |
284 | |
285 | =head2 match_type |
286 | |
287 | Get or set the constraint's match_type. Only valid values are "full" |
288 | or "partial." |
289 | |
290 | my $match_type = $constraint->match_type('FULL'); |
291 | |
292 | =cut |
293 | |
c3b0b535 |
294 | my ( $self, $arg ) = @_; |
752608d5 |
295 | |
c3b0b535 |
296 | if ( $arg ) { |
297 | $arg = lc $arg; |
752608d5 |
298 | return $self->error("Invalid match type: $arg") |
299 | unless $arg eq 'full' || $arg eq 'partial'; |
300 | $self->{'match_type'} = $arg; |
301 | } |
302 | |
303 | return $self->{'match_type'} || ''; |
304 | } |
305 | |
306 | # ---------------------------------------------------------------------- |
3c5de62a |
307 | sub name { |
308 | |
309 | =pod |
310 | |
311 | =head2 name |
312 | |
313 | Get or set the constraint's name. |
314 | |
315 | my $name = $constraint->name('foo'); |
316 | |
317 | =cut |
318 | |
319 | my $self = shift; |
695c2da2 |
320 | my $arg = shift || ''; |
321 | $self->{'name'} = $arg if $arg; |
3c5de62a |
322 | return $self->{'name'} || ''; |
323 | } |
324 | |
325 | # ---------------------------------------------------------------------- |
dedb8f3b |
326 | sub options { |
327 | |
328 | =pod |
329 | |
330 | =head2 options |
331 | |
332 | Gets or adds to the constraints's options (e.g., "INITIALLY IMMEDIATE"). |
333 | Returns an array or array reference. |
334 | |
335 | $constraint->options('NORELY'); |
336 | my @options = $constraint->options; |
337 | |
338 | =cut |
339 | |
340 | my $self = shift; |
341 | my $options = parse_list_arg( @_ ); |
342 | |
343 | push @{ $self->{'options'} }, @$options; |
344 | |
345 | if ( ref $self->{'options'} ) { |
346 | return wantarray ? @{ $self->{'options'} || [] } : $self->{'options'}; |
347 | } |
348 | else { |
349 | return wantarray ? () : []; |
350 | } |
351 | } |
352 | |
353 | |
354 | # ---------------------------------------------------------------------- |
43b9dc7a |
355 | sub on_delete { |
356 | |
357 | =pod |
358 | |
359 | =head2 on_delete |
360 | |
361 | Get or set the constraint's "on delete" action. |
362 | |
363 | my $action = $constraint->on_delete('cascade'); |
364 | |
365 | =cut |
366 | |
367 | my $self = shift; |
368 | |
369 | if ( my $arg = shift ) { |
370 | # validate $arg? |
371 | $self->{'on_delete'} = $arg; |
372 | } |
373 | |
374 | return $self->{'on_delete'} || ''; |
375 | } |
376 | |
377 | # ---------------------------------------------------------------------- |
378 | sub on_update { |
379 | |
380 | =pod |
381 | |
382 | =head2 on_update |
383 | |
384 | Get or set the constraint's "on update" action. |
385 | |
386 | my $action = $constraint->on_update('no action'); |
387 | |
388 | =cut |
389 | |
390 | my $self = shift; |
391 | |
392 | if ( my $arg = shift ) { |
393 | # validate $arg? |
394 | $self->{'on_update'} = $arg; |
395 | } |
396 | |
397 | return $self->{'on_update'} || ''; |
398 | } |
399 | |
400 | # ---------------------------------------------------------------------- |
401 | sub reference_fields { |
402 | |
403 | =pod |
404 | |
405 | =head2 reference_fields |
406 | |
407 | Gets and set the fields in the referred table. Accepts a string, list or |
408 | arrayref; returns an array or array reference. |
409 | |
410 | $constraint->reference_fields('id'); |
411 | $constraint->reference_fields('id', 'name'); |
412 | $constraint->reference_fields( 'id, name' ); |
413 | $constraint->reference_fields( [ 'id', 'name' ] ); |
414 | $constraint->reference_fields( qw[ id name ] ); |
415 | |
416 | my @reference_fields = $constraint->reference_fields; |
417 | |
418 | =cut |
419 | |
420 | my $self = shift; |
752608d5 |
421 | my $fields = parse_list_arg( @_ ); |
43b9dc7a |
422 | |
423 | if ( @$fields ) { |
424 | $self->{'reference_fields'} = $fields; |
425 | } |
426 | |
2d034ab4 |
427 | # Nothing set so try and derive it from the other constraint data |
43b9dc7a |
428 | unless ( ref $self->{'reference_fields'} ) { |
2d034ab4 |
429 | my $table = $self->table or return $self->error('No table'); |
430 | my $schema = $table->schema or return $self->error('No schema'); |
431 | if ( my $ref_table_name = $self->reference_table ) { |
432 | my $ref_table = $schema->get_table( $ref_table_name ) or |
433 | return $self->error("Can't find table '$ref_table_name'"); |
434 | |
435 | if ( my $constraint = $ref_table->primary_key ) { |
436 | $self->{'reference_fields'} = [ $constraint->fields ]; |
437 | } |
438 | else { |
439 | $self->error( |
440 | 'No reference fields defined and cannot find primary key in ', |
441 | "reference table '$ref_table_name'" |
442 | ); |
443 | } |
43b9dc7a |
444 | } |
2d034ab4 |
445 | # No ref table so we are not that sort of constraint, hence no ref |
446 | # fields. So we let the return below return an empty list. |
43b9dc7a |
447 | } |
448 | |
449 | if ( ref $self->{'reference_fields'} ) { |
450 | return wantarray |
2d034ab4 |
451 | ? @{ $self->{'reference_fields'} } |
43b9dc7a |
452 | : $self->{'reference_fields'}; |
453 | } |
454 | else { |
455 | return wantarray ? () : []; |
456 | } |
457 | } |
458 | |
459 | # ---------------------------------------------------------------------- |
460 | sub reference_table { |
461 | |
462 | =pod |
463 | |
464 | =head2 reference_table |
465 | |
466 | Get or set the table referred to by the constraint. |
467 | |
468 | my $reference_table = $constraint->reference_table('foo'); |
469 | |
470 | =cut |
471 | |
472 | my $self = shift; |
473 | $self->{'reference_table'} = shift if @_; |
474 | return $self->{'reference_table'} || ''; |
475 | } |
476 | |
3c5de62a |
477 | # ---------------------------------------------------------------------- |
43b9dc7a |
478 | sub table { |
3c5de62a |
479 | |
480 | =pod |
481 | |
43b9dc7a |
482 | =head2 table |
3c5de62a |
483 | |
2d034ab4 |
484 | Get or set the constraint's table object. |
3c5de62a |
485 | |
43b9dc7a |
486 | my $table = $field->table; |
3c5de62a |
487 | |
488 | =cut |
489 | |
490 | my $self = shift; |
43b9dc7a |
491 | if ( my $arg = shift ) { |
492 | return $self->error('Not a table object') unless |
493 | UNIVERSAL::isa( $arg, 'SQL::Translator::Schema::Table' ); |
494 | $self->{'table'} = $arg; |
495 | } |
496 | |
497 | return $self->{'table'}; |
498 | } |
499 | |
500 | # ---------------------------------------------------------------------- |
dedb8f3b |
501 | sub type { |
43b9dc7a |
502 | |
503 | =pod |
504 | |
dedb8f3b |
505 | =head2 type |
43b9dc7a |
506 | |
dedb8f3b |
507 | Get or set the constraint's type. |
43b9dc7a |
508 | |
dedb8f3b |
509 | my $type = $constraint->type( PRIMARY_KEY ); |
43b9dc7a |
510 | |
511 | =cut |
512 | |
c3b0b535 |
513 | my ( $self, $type ) = @_; |
43b9dc7a |
514 | |
c3b0b535 |
515 | if ( $type ) { |
516 | $type = uc $type; |
dedb8f3b |
517 | $type =~ s/_/ /g; |
518 | return $self->error("Invalid constraint type: $type") |
695c2da2 |
519 | unless $VALID_CONSTRAINT_TYPE{ $type }; |
dedb8f3b |
520 | $self->{'type'} = $type; |
43b9dc7a |
521 | } |
3c5de62a |
522 | |
dedb8f3b |
523 | return $self->{'type'} || ''; |
524 | } |
abf315bb |
525 | |
526 | # ---------------------------------------------------------------------- |
527 | sub equals { |
528 | |
529 | =pod |
530 | |
531 | =head2 equals |
532 | |
533 | Determines if this constraint is the same as another |
534 | |
535 | my $isIdentical = $constraint1->equals( $constraint2 ); |
536 | |
537 | =cut |
538 | |
539 | my $self = shift; |
540 | my $other = shift; |
541 | my $case_insensitive = shift; |
d990d84b |
542 | my $ignore_constraint_names = shift; |
abf315bb |
543 | |
544 | return 0 unless $self->SUPER::equals($other); |
b8d24485 |
545 | return 0 unless $self->type eq $other->type; |
d990d84b |
546 | unless ($ignore_constraint_names) { |
547 | return 0 unless $case_insensitive ? uc($self->name) eq uc($other->name) : $self->name eq $other->name; |
548 | } |
abf315bb |
549 | return 0 unless $self->deferrable eq $other->deferrable; |
4598b71c |
550 | #return 0 unless $self->is_valid eq $other->is_valid; |
abf315bb |
551 | return 0 unless $case_insensitive ? uc($self->table->name) eq uc($other->table->name) |
552 | : $self->table->name eq $other->table->name; |
553 | return 0 unless $self->expression eq $other->expression; |
6a0f3000 |
554 | |
555 | # Check fields, regardless of order |
556 | my %otherFields = (); # create a hash of the other fields |
557 | foreach my $otherField ($other->fields) { |
558 | $otherField = uc($otherField) if $case_insensitive; |
559 | $otherFields{$otherField} = 1; |
560 | } |
561 | foreach my $selfField ($self->fields) { # check for self fields in hash |
562 | $selfField = uc($selfField) if $case_insensitive; |
563 | return 0 unless $otherFields{$selfField}; |
564 | delete $otherFields{$selfField}; |
565 | } |
566 | # Check all other fields were accounted for |
567 | return 0 unless keys %otherFields == 0; |
568 | |
569 | # Check reference fields, regardless of order |
570 | my %otherRefFields = (); # create a hash of the other reference fields |
571 | foreach my $otherRefField ($other->reference_fields) { |
572 | $otherRefField = uc($otherRefField) if $case_insensitive; |
573 | $otherRefFields{$otherRefField} = 1; |
574 | } |
575 | foreach my $selfRefField ($self->reference_fields) { # check for self reference fields in hash |
576 | $selfRefField = uc($selfRefField) if $case_insensitive; |
577 | return 0 unless $otherRefFields{$selfRefField}; |
578 | delete $otherRefFields{$selfRefField}; |
579 | } |
580 | # Check all other reference fields were accounted for |
581 | return 0 unless keys %otherRefFields == 0; |
582 | |
b8d24485 |
583 | return 0 unless $case_insensitive ? uc($self->reference_table) eq uc($other->reference_table) : $self->reference_table eq $other->reference_table; |
abf315bb |
584 | return 0 unless $self->match_type eq $other->match_type; |
585 | return 0 unless $self->on_delete eq $other->on_delete; |
586 | return 0 unless $self->on_update eq $other->on_update; |
4598b71c |
587 | return 0 unless $self->_compare_objects(scalar $self->options, scalar $other->options); |
588 | return 0 unless $self->_compare_objects(scalar $self->extra, scalar $other->extra); |
abf315bb |
589 | return 1; |
590 | } |
591 | |
752608d5 |
592 | # ---------------------------------------------------------------------- |
593 | sub DESTROY { |
594 | my $self = shift; |
595 | undef $self->{'table'}; # destroy cyclical reference |
596 | } |
597 | |
3c5de62a |
598 | 1; |
599 | |
600 | # ---------------------------------------------------------------------- |
601 | |
602 | =pod |
603 | |
604 | =head1 AUTHOR |
605 | |
c3b0b535 |
606 | Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>. |
3c5de62a |
607 | |
608 | =cut |