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1 | package SQL::Translator::Schema::Field; |
2 | |
3 | # ---------------------------------------------------------------------- |
aadf4042 |
4 | # $Id: Field.pm,v 1.8 2003-06-09 02:10:59 kycl4rk Exp $ |
3c5de62a |
5 | # ---------------------------------------------------------------------- |
6 | # Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org> |
7 | # |
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. |
11 | # |
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. |
16 | # |
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 |
20 | # 02111-1307 USA |
21 | # ------------------------------------------------------------------- |
22 | |
23 | =pod |
24 | |
25 | =head1 NAME |
26 | |
27 | SQL::Translator::Schema::Field - SQL::Translator field object |
28 | |
29 | =head1 SYNOPSIS |
30 | |
31 | use SQL::Translator::Schema::Field; |
32 | my $field = SQL::Translator::Schema::Field->new( |
33 | name => 'foo', |
34 | sql => 'select * from foo', |
35 | ); |
36 | |
37 | =head1 DESCRIPTION |
38 | |
39 | C<SQL::Translator::Schema::Field> is the field object. |
40 | |
41 | =head1 METHODS |
42 | |
43 | =cut |
44 | |
45 | use strict; |
46 | use Class::Base; |
43b9dc7a |
47 | use SQL::Translator::Schema::Constants; |
ec2ab48d |
48 | use SQL::Translator::Utils 'parse_list_arg'; |
3c5de62a |
49 | |
50 | use base 'Class::Base'; |
51 | use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT); |
52 | |
53 | $VERSION = 1.00; |
54 | |
55 | # ---------------------------------------------------------------------- |
56 | sub init { |
57 | |
58 | =pod |
59 | |
60 | =head2 new |
61 | |
62 | Object constructor. |
63 | |
64 | my $schema = SQL::Translator::Schema::Field->new; |
65 | |
66 | =cut |
67 | |
68 | my ( $self, $config ) = @_; |
43b9dc7a |
69 | |
ec2ab48d |
70 | for my $arg ( |
71 | qw[ |
72 | table name data_type size is_primary_key is_nullable |
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73 | is_auto_increment default_value comments |
ec2ab48d |
74 | ] |
75 | ) { |
43b9dc7a |
76 | next unless defined $config->{ $arg }; |
c941e9bf |
77 | defined $self->$arg( $config->{ $arg } ) or return; |
43b9dc7a |
78 | } |
c941e9bf |
79 | |
3c5de62a |
80 | return $self; |
81 | } |
82 | |
83 | # ---------------------------------------------------------------------- |
5ac417ad |
84 | sub comments { |
85 | |
86 | =pod |
87 | |
88 | =head2 comments |
89 | |
90 | Get or set the comments on a field. May be called several times to |
91 | set and it will accumulate the comments. Called in an array context, |
92 | returns each comment individually; called in a scalar context, returns |
93 | all the comments joined on newlines. |
94 | |
95 | $field->comments('foo'); |
96 | $field->comments('bar'); |
97 | print join( ', ', $field->comments ); # prints "foo, bar" |
98 | |
99 | =cut |
100 | |
101 | my $self = shift; |
aadf4042 |
102 | |
103 | for my $arg ( @_ ) { |
104 | $arg = $arg->[0] if ref $arg; |
105 | push @{ $self->{'comments'} }, $arg; |
106 | } |
5ac417ad |
107 | |
108 | return wantarray |
109 | ? @{ $self->{'comments'} || [] } |
110 | : join( "\n", @{ $self->{'comments'} || [] } ); |
111 | } |
112 | |
113 | |
114 | # ---------------------------------------------------------------------- |
3c5de62a |
115 | sub data_type { |
116 | |
117 | =pod |
118 | |
119 | =head2 data_type |
120 | |
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121 | Get or set the field's data type. |
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122 | |
123 | my $data_type = $field->data_type('integer'); |
124 | |
125 | =cut |
126 | |
127 | my $self = shift; |
128 | $self->{'data_type'} = shift if @_; |
129 | return $self->{'data_type'} || ''; |
130 | } |
131 | |
132 | # ---------------------------------------------------------------------- |
43b9dc7a |
133 | sub default_value { |
134 | |
135 | =pod |
136 | |
137 | =head2 default_value |
138 | |
139 | Get or set the field's default value. Will return undef if not defined |
140 | and could return the empty string (it's a valid default value), so don't |
141 | assume an error like other methods. |
142 | |
143 | my $default = $field->default_value('foo'); |
144 | |
145 | =cut |
146 | |
147 | my ( $self, $arg ) = @_; |
148 | $self->{'default_value'} = $arg if defined $arg; |
149 | return $self->{'default_value'}; |
150 | } |
151 | |
152 | # ---------------------------------------------------------------------- |
9966eebc |
153 | sub extra { |
154 | |
155 | =pod |
156 | |
157 | =head2 extra |
158 | |
159 | Get or set the field's "extra" attibutes (e.g., "ZEROFILL" for MySQL). |
160 | Accepts a hash(ref) of name/value pairs to store; returns a hash. |
161 | |
162 | $field->extra( qualifier => 'ZEROFILL' ); |
163 | my %extra = $field->extra; |
164 | |
165 | =cut |
166 | |
167 | my $self = shift; |
168 | my $args = ref $_[0] eq 'HASH' ? shift : { @_ }; |
169 | |
170 | while ( my ( $key, $value ) = each %$args ) { |
171 | $self->{'extra'}{ $key } = $value; |
172 | } |
173 | |
174 | return %{ $self->{'extra'} || {} }; |
175 | } |
176 | |
177 | # ---------------------------------------------------------------------- |
178 | sub foreign_key_reference { |
179 | |
180 | =pod |
181 | |
182 | =head2 foreign_key_reference |
183 | |
184 | Get or set the field's foreign key reference; |
185 | |
186 | my $constraint = $field->foreign_key_reference( $constraint ); |
187 | |
188 | =cut |
189 | |
190 | my $self = shift; |
191 | |
192 | if ( my $arg = shift ) { |
193 | my $class = 'SQL::Translator::Schema::Constraint'; |
194 | if ( UNIVERSAL::isa( $arg, $class ) ) { |
195 | return $self->error( |
196 | 'Foreign key reference for ', $self->name, 'already defined' |
197 | ) if $self->{'foreign_key_reference'}; |
198 | |
199 | $self->{'foreign_key_reference'} = $arg; |
200 | } |
201 | else { |
202 | return $self->error( |
203 | "Argument to foreign_key_reference is not an $class object" |
204 | ); |
205 | } |
206 | } |
207 | |
208 | return $self->{'foreign_key_reference'}; |
209 | } |
210 | |
211 | # ---------------------------------------------------------------------- |
43b9dc7a |
212 | sub is_auto_increment { |
213 | |
214 | =pod |
215 | |
216 | =head2 is_auto_increment |
217 | |
218 | Get or set the field's C<is_auto_increment> attribute. |
219 | |
220 | my $is_pk = $field->is_auto_increment(1); |
221 | |
222 | =cut |
223 | |
224 | my ( $self, $arg ) = @_; |
225 | |
226 | if ( defined $arg ) { |
227 | $self->{'is_auto_increment'} = $arg ? 1 : 0; |
228 | } |
229 | |
230 | unless ( defined $self->{'is_auto_increment'} ) { |
231 | if ( my $table = $self->table ) { |
232 | if ( my $schema = $table->schema ) { |
233 | if ( |
234 | $schema->database eq 'PostgreSQL' && |
235 | $self->data_type eq 'serial' |
236 | ) { |
237 | $self->{'is_auto_increment'} = 1; |
238 | } |
239 | } |
240 | } |
241 | } |
242 | |
243 | return $self->{'is_auto_increment'} || 0; |
244 | } |
245 | |
246 | # ---------------------------------------------------------------------- |
9966eebc |
247 | sub is_foreign_key { |
248 | |
249 | =pod |
250 | |
251 | =head2 is_foreign_key |
252 | |
253 | Returns whether or not the field is a foreign key. |
254 | |
255 | my $is_fk = $field->is_foreign_key; |
256 | |
257 | =cut |
258 | |
259 | my ( $self, $arg ) = @_; |
260 | |
261 | unless ( defined $self->{'is_foreign_key'} ) { |
262 | if ( my $table = $self->table ) { |
263 | for my $c ( $table->get_constraints ) { |
264 | if ( $c->type eq FOREIGN_KEY ) { |
265 | my %fields = map { $_, 1 } $c->fields; |
266 | if ( $fields{ $self->name } ) { |
267 | $self->{'is_foreign_key'} = 1; |
268 | $self->foreign_key_reference( $c ); |
269 | last; |
270 | } |
271 | } |
272 | } |
273 | } |
274 | } |
275 | |
276 | return $self->{'is_foreign_key'} || 0; |
277 | } |
278 | |
279 | |
280 | # ---------------------------------------------------------------------- |
ec2ab48d |
281 | sub is_nullable { |
282 | |
283 | =pod |
284 | |
285 | =head2 is_nullable |
286 | |
287 | Get or set the whether the field can be null. If not defined, then |
288 | returns "1" (assumes the field can be null). The argument is evaluated |
289 | by Perl for True or False, so the following are eqivalent: |
290 | |
291 | $is_nullable = $field->is_nullable(0); |
292 | $is_nullable = $field->is_nullable(''); |
293 | $is_nullable = $field->is_nullable('0'); |
294 | |
295 | While this is technically a field constraint, it's probably easier to |
296 | represent this as an attribute of the field. In order keep things |
297 | consistent, any other constraint on the field (unique, primary, and |
298 | foreign keys; checks) are represented as table constraints. |
299 | |
300 | =cut |
301 | |
302 | my ( $self, $arg ) = @_; |
303 | |
304 | if ( defined $arg ) { |
305 | $self->{'is_nullable'} = $arg ? 1 : 0; |
306 | } |
307 | |
308 | return defined $self->{'is_nullable'} ? $self->{'is_nullable'} : 1; |
309 | } |
310 | |
311 | # ---------------------------------------------------------------------- |
3c5de62a |
312 | sub is_primary_key { |
313 | |
314 | =pod |
315 | |
316 | =head2 is_primary_key |
317 | |
ec2ab48d |
318 | Get or set the field's C<is_primary_key> attribute. Does not create |
319 | a table constraint (should it?). |
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320 | |
321 | my $is_pk = $field->is_primary_key(1); |
322 | |
323 | =cut |
324 | |
325 | my ( $self, $arg ) = @_; |
326 | |
327 | if ( defined $arg ) { |
328 | $self->{'is_primary_key'} = $arg ? 1 : 0; |
329 | } |
330 | |
43b9dc7a |
331 | unless ( defined $self->{'is_primary_key'} ) { |
332 | if ( my $table = $self->table ) { |
333 | if ( my $pk = $table->primary_key ) { |
334 | my %fields = map { $_, 1 } $pk->fields; |
335 | $self->{'is_primary_key'} = $fields{ $self->name } || 0; |
336 | } |
337 | else { |
338 | $self->{'is_primary_key'} = 0; |
339 | } |
340 | } |
341 | } |
342 | |
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343 | return $self->{'is_primary_key'} || 0; |
344 | } |
345 | |
346 | # ---------------------------------------------------------------------- |
ec2ab48d |
347 | sub is_valid { |
348 | |
349 | =pod |
350 | |
351 | =head2 is_valid |
352 | |
353 | Determine whether the field is valid or not. |
354 | |
355 | my $ok = $field->is_valid; |
356 | |
357 | =cut |
358 | |
359 | my $self = shift; |
360 | return $self->error('No name') unless $self->name; |
361 | return $self->error('No data type') unless $self->data_type; |
362 | return $self->error('No table object') unless $self->table; |
363 | return 1; |
364 | } |
365 | |
366 | # ---------------------------------------------------------------------- |
3c5de62a |
367 | sub name { |
368 | |
369 | =pod |
370 | |
371 | =head2 name |
372 | |
373 | Get or set the field's name. |
374 | |
375 | my $name = $field->name('foo'); |
376 | |
377 | =cut |
378 | |
379 | my $self = shift; |
43b9dc7a |
380 | |
381 | if ( my $arg = shift ) { |
382 | if ( my $table = $self->table ) { |
383 | return $self->error( qq[Can't use field name "$arg": table exists] ) |
384 | if $table->get_field( $arg ); |
385 | } |
386 | |
387 | $self->{'name'} = $arg; |
388 | } |
389 | |
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390 | return $self->{'name'} || ''; |
391 | } |
392 | |
393 | # ---------------------------------------------------------------------- |
ec2ab48d |
394 | sub order { |
3c5de62a |
395 | |
396 | =pod |
397 | |
ec2ab48d |
398 | =head2 order |
3c5de62a |
399 | |
ec2ab48d |
400 | Get or set the field's order. |
3c5de62a |
401 | |
ec2ab48d |
402 | my $order = $field->order(3); |
3c5de62a |
403 | |
404 | =cut |
405 | |
406 | my ( $self, $arg ) = @_; |
407 | |
ec2ab48d |
408 | if ( defined $arg && $arg =~ /^\d+$/ ) { |
409 | $self->{'order'} = $arg; |
3c5de62a |
410 | } |
411 | |
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412 | return $self->{'order'} || 0; |
43b9dc7a |
413 | } |
414 | |
415 | # ---------------------------------------------------------------------- |
416 | sub size { |
417 | |
418 | =pod |
419 | |
420 | =head2 size |
421 | |
422 | Get or set the field's size. Accepts a string, array or arrayref of |
423 | numbers and returns a string. |
424 | |
425 | $field->size( 30 ); |
426 | $field->size( [ 255 ] ); |
427 | $size = $field->size( 10, 2 ); |
428 | print $size; # prints "10,2" |
429 | |
430 | $size = $field->size( '10, 2' ); |
431 | print $size; # prints "10,2" |
432 | |
433 | =cut |
434 | |
435 | my $self = shift; |
ec2ab48d |
436 | my $numbers = parse_list_arg( @_ ); |
43b9dc7a |
437 | |
438 | if ( @$numbers ) { |
439 | my @new; |
440 | for my $num ( @$numbers ) { |
441 | if ( defined $num && $num =~ m/^\d+(?:\.\d+)?$/ ) { |
442 | push @new, $num; |
443 | } |
444 | } |
445 | $self->{'size'} = \@new if @new; # only set if all OK |
446 | } |
447 | |
ec2ab48d |
448 | return wantarray |
aadf4042 |
449 | ? @{ $self->{'size'} || [0] } |
ec2ab48d |
450 | : join( ',', @{ $self->{'size'} || [0] } ) |
451 | ; |
43b9dc7a |
452 | } |
453 | |
454 | # ---------------------------------------------------------------------- |
455 | sub table { |
456 | |
457 | =pod |
458 | |
459 | =head2 table |
460 | |
461 | Get or set the field's table object. |
462 | |
463 | my $table = $field->table; |
464 | |
465 | =cut |
466 | |
467 | my $self = shift; |
468 | if ( my $arg = shift ) { |
469 | return $self->error('Not a table object') unless |
470 | UNIVERSAL::isa( $arg, 'SQL::Translator::Schema::Table' ); |
471 | $self->{'table'} = $arg; |
472 | } |
473 | |
474 | return $self->{'table'}; |
3c5de62a |
475 | } |
476 | |
ec2ab48d |
477 | # ---------------------------------------------------------------------- |
478 | sub DESTROY { |
9966eebc |
479 | # |
480 | # Destroy cyclical references. |
481 | # |
ec2ab48d |
482 | my $self = shift; |
9966eebc |
483 | undef $self->{'table'}; |
484 | undef $self->{'foreign_key_reference'}; |
ec2ab48d |
485 | } |
486 | |
3c5de62a |
487 | 1; |
488 | |
489 | # ---------------------------------------------------------------------- |
490 | |
491 | =pod |
492 | |
493 | =head1 AUTHOR |
494 | |
495 | Ken Y. Clark E<lt>kclark@cpan.orgE<gt> |
496 | |
497 | =cut |