1 package SQL::Translator::Schema::Table;
3 # ----------------------------------------------------------------------
4 # $Id: Table.pm,v 1.18 2003-08-29 14:54:01 kycl4rk Exp $
5 # ----------------------------------------------------------------------
6 # Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>
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::Table - SQL::Translator table object
31 use SQL::Translator::Schema::Table;
32 my $table = SQL::Translator::Schema::Table->new( name => 'foo' );
36 C<SQL::Translator::Schema::Table> is the table object.
44 use SQL::Translator::Utils 'parse_list_arg';
45 use SQL::Translator::Schema::Constants;
46 use SQL::Translator::Schema::Constraint;
47 use SQL::Translator::Schema::Field;
48 use SQL::Translator::Schema::Index;
51 use base 'Class::Base';
52 use vars qw( $VERSION $FIELD_ORDER );
54 $VERSION = sprintf "%d.%02d", q$Revision: 1.18 $ =~ /(\d+)\.(\d+)/;
56 # ----------------------------------------------------------------------
65 my $table = SQL::Translator::Schema::Table->new(
72 my ( $self, $config ) = @_;
74 for my $arg ( qw[ schema name comments ] ) {
75 next unless defined $config->{ $arg };
76 defined $self->$arg( $config->{ $arg } ) or return;
82 # ----------------------------------------------------------------------
89 Add a constraint to the table. Returns the newly created
90 C<SQL::Translator::Schema::Constraint> object.
92 my $c1 = $table->add_constraint(
95 fields => [ 'foo_id' ],
98 my $c2 = SQL::Translator::Schema::Constraint->new( name => 'uniq' );
99 $c2 = $table->add_constraint( $constraint );
104 my $constraint_class = 'SQL::Translator::Schema::Constraint';
107 if ( UNIVERSAL::isa( $_[0], $constraint_class ) ) {
109 $constraint->table( $self );
113 $args{'table'} = $self;
114 $constraint = $constraint_class->new( \%args ) or
115 return $self->error( $constraint_class->error );
119 # If we're trying to add a PK when one is already defined,
120 # then just add the fields to the existing definition.
123 my $pk = $self->primary_key;
124 if ( $pk && $constraint->type eq PRIMARY_KEY ) {
125 $self->primary_key( $constraint->fields );
129 elsif ( $constraint->type eq PRIMARY_KEY ) {
130 for my $fname ( $constraint->fields ) {
131 if ( my $f = $self->get_field( $fname ) ) {
132 $f->is_primary_key( 1 );
137 # See if another constraint of the same type
138 # covers the same fields.
140 elsif ( $constraint->type ne CHECK_C ) {
141 my @field_names = $constraint->fields;
143 grep { $_->type eq $constraint->type }
144 $self->get_constraints
146 my %fields = map { $_, 1 } $c->fields;
147 for my $field_name ( @field_names ) {
148 if ( $fields{ $field_name } ) {
159 push @{ $self->{'constraints'} }, $constraint;
165 # ----------------------------------------------------------------------
172 Add an index to the table. Returns the newly created
173 C<SQL::Translator::Schema::Index> object.
175 my $i1 = $table->add_index(
177 fields => [ 'name' ],
181 my $i2 = SQL::Translator::Schema::Index->new( name => 'id' );
182 $i2 = $table->add_index( $index );
187 my $index_class = 'SQL::Translator::Schema::Index';
190 if ( UNIVERSAL::isa( $_[0], $index_class ) ) {
192 $index->table( $self );
196 $args{'table'} = $self;
197 $index = $index_class->new( \%args ) or return
198 $self->error( $index_class->error );
201 push @{ $self->{'indices'} }, $index;
205 # ----------------------------------------------------------------------
212 Add an field to the table. Returns the newly created
213 C<SQL::Translator::Schema::Field> object. The "name" parameter is
214 required. If you try to create a field with the same name as an
215 existing field, you will get an error and the field will not be created.
217 my $f1 = $table->add_field(
219 data_type => 'integer',
223 my $f2 = SQL::Translator::Schema::Field->new(
227 $f2 = $table->add_field( $field2 ) or die $table->error;
232 my $field_class = 'SQL::Translator::Schema::Field';
235 if ( UNIVERSAL::isa( $_[0], $field_class ) ) {
237 $field->table( $self );
241 $args{'table'} = $self;
242 $field = $field_class->new( \%args ) or return
243 $self->error( $field_class->error );
246 $field->order( ++$FIELD_ORDER );
247 my $field_name = $field->name or return $self->error('No name');
249 if ( exists $self->{'fields'}{ $field_name } ) {
250 return $self->error(qq[Can't create field: "$field_name" exists]);
253 $self->{'fields'}{ $field_name } = $field;
259 # ----------------------------------------------------------------------
266 Get or set the comments on a table. May be called several times to
267 set and it will accumulate the comments. Called in an array context,
268 returns each comment individually; called in a scalar context, returns
269 all the comments joined on newlines.
271 $table->comments('foo');
272 $table->comments('bar');
273 print join( ', ', $table->comments ); # prints "foo, bar"
278 my @comments = ref $_[0] ? @{ $_[0] } : @_;
280 for my $arg ( @comments ) {
281 $arg = $arg->[0] if ref $arg;
282 push @{ $self->{'comments'} }, $arg if defined $arg && $arg;
285 if ( @{ $self->{'comments'} || [] } ) {
287 ? @{ $self->{'comments'} }
288 : join( "\n", @{ $self->{'comments'} } )
292 return wantarray ? () : undef;
296 # ----------------------------------------------------------------------
297 sub get_constraints {
301 =head2 get_constraints
303 Returns all the constraint objects as an array or array reference.
305 my @constraints = $table->get_constraints;
311 if ( ref $self->{'constraints'} ) {
313 ? @{ $self->{'constraints'} } : $self->{'constraints'};
316 $self->error('No constraints');
317 return wantarray ? () : undef;
321 # ----------------------------------------------------------------------
328 Returns all the index objects as an array or array reference.
330 my @indices = $table->get_indices;
336 if ( ref $self->{'indices'} ) {
338 ? @{ $self->{'indices'} }
339 : $self->{'indices'};
342 $self->error('No indices');
343 return wantarray ? () : undef;
347 # ----------------------------------------------------------------------
354 Returns a field by the name provided.
356 my $field = $table->get_field('foo');
361 my $field_name = shift or return $self->error('No field name');
362 return $self->error( qq[Field "$field_name" does not exist] ) unless
363 exists $self->{'fields'}{ $field_name };
364 return $self->{'fields'}{ $field_name };
367 # ----------------------------------------------------------------------
374 Returns all the field objects as an array or array reference.
376 my @fields = $table->get_fields;
383 sort { $a->[0] <=> $b->[0] }
384 map { [ $_->order, $_ ] }
385 values %{ $self->{'fields'} || {} };
388 return wantarray ? @fields : \@fields;
391 $self->error('No fields');
392 return wantarray ? () : undef;
396 # ----------------------------------------------------------------------
403 Determine whether the view is valid or not.
405 my $ok = $view->is_valid;
410 return $self->error('No name') unless $self->name;
411 return $self->error('No fields') unless $self->get_fields;
414 $self->get_fields, $self->get_indices, $self->get_constraints
416 return $object->error unless $object->is_valid;
422 # ----------------------------------------------------------------------
432 return $self->{'is_data'} if defined $self->{'is_data'};
434 $self->{'is_data'} = 0;
436 foreach my $field ( $self->get_fields ) {
437 if ( !$field->is_primary_key and !$field->is_foreign_key ) {
438 $self->{'is_data'} = 1;
439 return $self->{'is_data'};
443 return $self->{'is_data'};
446 # ----------------------------------------------------------------------
453 Determine whether the table can link two arg tables via many-to-many.
455 my $ok = $table->can_link($table1,$table2);
459 my ( $self, $table1, $table2 ) = @_;
461 return $self->{'can_link'}{ $table1->name }{ $table2->name }
462 if defined $self->{'can_link'}{ $table1->name }{ $table2->name };
464 if ( $self->is_data == 1 ) {
465 $self->{'can_link'}{ $table1->name }{ $table2->name } = [0];
466 $self->{'can_link'}{ $table2->name }{ $table1->name } = [0];
467 return $self->{'can_link'}{ $table1->name }{ $table2->name };
472 foreach my $field ( $self->get_fields ) {
473 if ( $field->is_foreign_key ) {
474 push @{ $fk{ $field->foreign_key_reference->reference_table } },
475 $field->foreign_key_reference;
479 if ( !defined( $fk{ $table1->name } ) or !defined( $fk{ $table2->name } ) )
481 $self->{'can_link'}{ $table1->name }{ $table2->name } = [0];
482 $self->{'can_link'}{ $table2->name }{ $table1->name } = [0];
483 return $self->{'can_link'}{ $table1->name }{ $table2->name };
486 # trivial traversal, only one way to link the two tables
487 if ( scalar( @{ $fk{ $table1->name } } == 1 )
488 and scalar( @{ $fk{ $table2->name } } == 1 ) )
490 $self->{'can_link'}{ $table1->name }{ $table2->name } =
491 [ 'one2one', $fk{ $table1->name }, $fk{ $table2->name } ];
492 $self->{'can_link'}{ $table1->name }{ $table2->name } =
493 [ 'one2one', $fk{ $table2->name }, $fk{ $table1->name } ];
495 # non-trivial traversal. one way to link table2,
496 # many ways to link table1
498 elsif ( scalar( @{ $fk{ $table1->name } } > 1 )
499 and scalar( @{ $fk{ $table2->name } } == 1 ) )
501 $self->{'can_link'}{ $table1->name }{ $table2->name } =
502 [ 'many2one', $fk{ $table1->name }, $fk{ $table2->name } ];
503 $self->{'can_link'}{ $table2->name }{ $table1->name } =
504 [ 'one2many', $fk{ $table2->name }, $fk{ $table1->name } ];
506 # non-trivial traversal. one way to link table1,
507 # many ways to link table2
509 elsif ( scalar( @{ $fk{ $table1->name } } == 1 )
510 and scalar( @{ $fk{ $table2->name } } > 1 ) )
512 $self->{'can_link'}{ $table1->name }{ $table2->name } =
513 [ 'one2many', $fk{ $table1->name }, $fk{ $table2->name } ];
514 $self->{'can_link'}{ $table2->name }{ $table1->name } =
515 [ 'many2one', $fk{ $table2->name }, $fk{ $table1->name } ];
517 # non-trivial traversal. many ways to link table1 and table2
519 elsif ( scalar( @{ $fk{ $table1->name } } > 1 )
520 and scalar( @{ $fk{ $table2->name } } > 1 ) )
522 $self->{'can_link'}{ $table1->name }{ $table2->name } =
523 [ 'many2many', $fk{ $table1->name }, $fk{ $table2->name } ];
524 $self->{'can_link'}{ $table2->name }{ $table1->name } =
525 [ 'many2many', $fk{ $table2->name }, $fk{ $table1->name } ];
527 # one of the tables didn't export a key
528 # to this table, no linking possible
531 $self->{'can_link'}{ $table1->name }{ $table2->name } = [0];
532 $self->{'can_link'}{ $table2->name }{ $table1->name } = [0];
535 return $self->{'can_link'}{ $table1->name }{ $table2->name };
538 # ----------------------------------------------------------------------
545 Get or set the table's name.
547 If provided an argument, checks the schema object for a table of
548 that name and disallows the change if one exists.
550 my $table_name = $table->name('foo');
556 if ( my $arg = shift ) {
557 if ( my $schema = $self->schema ) {
558 return $self->error( qq[Can't use table name "$arg": table exists] )
559 if $schema->get_table( $arg );
561 $self->{'name'} = $arg;
564 return $self->{'name'} || '';
567 # ----------------------------------------------------------------------
574 Get or set the table's schema object.
576 my $schema = $table->schema;
581 if ( my $arg = shift ) {
582 return $self->error('Not a schema object') unless
583 UNIVERSAL::isa( $arg, 'SQL::Translator::Schema' );
584 $self->{'schema'} = $arg;
587 return $self->{'schema'};
590 # ----------------------------------------------------------------------
597 Gets or sets the table's primary key(s). Takes one or more field
598 names (as a string, list or array[ref]) as an argument. If the field
599 names are present, it will create a new PK if none exists, or it will
600 add to the fields of an existing PK (and will unique the field names).
601 Returns the C<SQL::Translator::Schema::Constraint> object representing
606 $table->primary_key('id');
607 $table->primary_key(['name']);
608 $table->primary_key('id','name']);
609 $table->primary_key(['id','name']);
610 $table->primary_key('id,name');
611 $table->primary_key(qw[ id name ]);
613 my $pk = $table->primary_key;
618 my $fields = parse_list_arg( @_ );
622 for my $f ( @$fields ) {
623 return $self->error(qq[Invalid field "$f"]) unless
624 $self->get_field($f);
628 for my $c ( $self->get_constraints ) {
629 if ( $c->type eq PRIMARY_KEY ) {
631 $c->fields( @{ $c->fields }, @$fields );
637 $constraint = $self->add_constraint(
648 for my $c ( $self->get_constraints ) {
649 return $c if $c->type eq PRIMARY_KEY;
656 # ----------------------------------------------------------------------
663 Get or set the table's options (e.g., table types for MySQL). Returns
664 an array or array reference.
666 my @options = $table->options;
671 my $options = parse_list_arg( @_ );
673 push @{ $self->{'options'} }, @$options;
675 if ( ref $self->{'options'} ) {
676 return wantarray ? @{ $self->{'options'} || [] } : $self->{'options'};
679 return wantarray ? () : [];
683 # ----------------------------------------------------------------------
690 Get or set the table's order.
692 my $order = $table->order(3);
696 my ( $self, $arg ) = @_;
698 if ( defined $arg && $arg =~ /^\d+$/ ) {
699 $self->{'order'} = $arg;
702 return $self->{'order'} || 0;
705 # ----------------------------------------------------------------------
708 undef $self->{'schema'}; # destroy cyclical reference
709 undef $_ for @{ $self->{'constraints'} };
710 undef $_ for @{ $self->{'indices'} };
711 undef $_ for values %{ $self->{'fields'} };
716 # ----------------------------------------------------------------------
722 Ken Y. Clark E<lt>kclark@cpan.orgE<gt>,
723 Allen Day E<lt>allenday@ucla.eduE<gt>.