1 package SQL::Translator::Schema;
3 # ----------------------------------------------------------------------
4 # $Id: Schema.pm,v 1.17 2004-10-15 02:23:30 allenday Exp $
5 # ----------------------------------------------------------------------
6 # Copyright (C) 2002-4 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 - SQL::Translator schema object
31 use SQL::Translator::Schema;
32 my $schema = SQL::Translator::Schema->new;
33 my $table = $schema->add_table( name => 'foo' );
34 my $view = $schema->add_view( name => 'bar', sql => '...' );
38 C<SQL::Translator::Schema> is the object that accepts, validates, and
39 returns the database structure.
47 use SQL::Translator::Schema::Constants;
48 use SQL::Translator::Schema::Procedure;
49 use SQL::Translator::Schema::Table;
50 use SQL::Translator::Schema::Trigger;
51 use SQL::Translator::Schema::View;
52 use SQL::Translator::Schema::Graph;
53 use SQL::Translator::Utils 'parse_list_arg';
55 use base 'Class::Base';
56 use vars qw[ $VERSION $TABLE_ORDER $VIEW_ORDER $TRIGGER_ORDER $PROC_ORDER ];
58 $VERSION = sprintf "%d.%02d", q$Revision: 1.17 $ =~ /(\d+)\.(\d+)/;
60 # ----------------------------------------------------------------------
69 my $schema = SQL::Translator::Schema->new(
76 my ( $self, $config ) = @_;
77 $self->params( $config, qw[ name database parser_args producer_args ] )
82 # ----------------------------------------------------------------------
89 Add a table object. Returns the new SQL::Translator::Schema::Table object.
90 The "name" parameter is required. If you try to create a table with the
91 same name as an existing table, you will get an error and the table will
94 my $t1 = $schema->add_table( name => 'foo' ) or die $schema->error;
95 my $t2 = SQL::Translator::Schema::Table->new( name => 'bar' );
96 $t2 = $schema->add_table( $table_bar ) or die $schema->error;
101 my $table_class = 'SQL::Translator::Schema::Table';
104 if ( UNIVERSAL::isa( $_[0], $table_class ) ) {
106 $table->schema( $self );
110 $args{'schema'} = $self;
111 $table = $table_class->new( \%args ) or return
112 $self->error( $table_class->error );
115 $table->order( ++$TABLE_ORDER );
116 # We know we have a name as the Table->new above errors if none given.
117 my $table_name = $table->name;
119 if ( defined $self->{'tables'}{ $table_name } ) {
120 return $self->error(qq[Can't create table: "$table_name" exists]);
123 $self->{'tables'}{ $table_name } = $table;
129 # ----------------------------------------------------------------------
136 Add a procedure object. Returns the new
137 SQL::Translator::Schema::Procedure object. The "name" parameter is
138 required. If you try to create a procedure with the same name as an
139 existing procedure, you will get an error and the procedure will not
142 my $p1 = $schema->add_procedure( name => 'foo' );
143 my $p2 = SQL::Translator::Schema::Procedure->new( name => 'bar' );
144 $p2 = $schema->add_procedure( $procedure_bar ) or die $schema->error;
149 my $procedure_class = 'SQL::Translator::Schema::Procedure';
152 if ( UNIVERSAL::isa( $_[0], $procedure_class ) ) {
154 $procedure->schema( $self );
158 $args{'schema'} = $self;
159 return $self->error('No procedure name') unless $args{'name'};
160 $procedure = $procedure_class->new( \%args ) or
161 return $self->error( $procedure_class->error );
164 $procedure->order( ++$PROC_ORDER );
165 my $procedure_name = $procedure->name or return
166 $self->error('No procedure name');
168 if ( defined $self->{'procedures'}{ $procedure_name } ) {
170 qq[Can't create procedure: "$procedure_name" exists]
174 $self->{'procedures'}{ $procedure_name } = $procedure;
180 # ----------------------------------------------------------------------
187 Add a trigger object. Returns the new SQL::Translator::Schema::Trigger object.
188 The "name" parameter is required. If you try to create a trigger with the
189 same name as an existing trigger, you will get an error and the trigger will
192 my $t1 = $schema->add_trigger( name => 'foo' );
193 my $t2 = SQL::Translator::Schema::Trigger->new( name => 'bar' );
194 $t2 = $schema->add_trigger( $trigger_bar ) or die $schema->error;
199 my $trigger_class = 'SQL::Translator::Schema::Trigger';
202 if ( UNIVERSAL::isa( $_[0], $trigger_class ) ) {
204 $trigger->schema( $self );
208 $args{'schema'} = $self;
209 return $self->error('No trigger name') unless $args{'name'};
210 $trigger = $trigger_class->new( \%args ) or
211 return $self->error( $trigger_class->error );
214 $trigger->order( ++$TRIGGER_ORDER );
215 my $trigger_name = $trigger->name or return $self->error('No trigger name');
217 if ( defined $self->{'triggers'}{ $trigger_name } ) {
218 return $self->error(qq[Can't create trigger: "$trigger_name" exists]);
221 $self->{'triggers'}{ $trigger_name } = $trigger;
227 # ----------------------------------------------------------------------
234 Add a view object. Returns the new SQL::Translator::Schema::View object.
235 The "name" parameter is required. If you try to create a view with the
236 same name as an existing view, you will get an error and the view will
239 my $v1 = $schema->add_view( name => 'foo' );
240 my $v2 = SQL::Translator::Schema::View->new( name => 'bar' );
241 $v2 = $schema->add_view( $view_bar ) or die $schema->error;
246 my $view_class = 'SQL::Translator::Schema::View';
249 if ( UNIVERSAL::isa( $_[0], $view_class ) ) {
251 $view->schema( $self );
255 $args{'schema'} = $self;
256 return $self->error('No view name') unless $args{'name'};
257 $view = $view_class->new( \%args ) or return $view_class->error;
260 $view->order( ++$VIEW_ORDER );
261 my $view_name = $view->name or return $self->error('No view name');
263 if ( defined $self->{'views'}{ $view_name } ) {
264 return $self->error(qq[Can't create view: "$view_name" exists]);
267 $self->{'views'}{ $view_name } = $view;
273 # ----------------------------------------------------------------------
280 Get or set the schema's database. (optional)
282 my $database = $schema->database('PostgreSQL');
287 $self->{'database'} = shift if @_;
288 return $self->{'database'} || '';
291 # ----------------------------------------------------------------------
298 Returns true if all the tables and views are valid.
300 my $ok = $schema->is_valid or die $schema->error;
306 return $self->error('No tables') unless $self->get_tables;
308 for my $object ( $self->get_tables, $self->get_views ) {
309 return $object->error unless $object->is_valid;
315 # ----------------------------------------------------------------------
322 Returns a procedure by the name provided.
324 my $procedure = $schema->get_procedure('foo');
329 my $procedure_name = shift or return $self->error('No procedure name');
330 return $self->error( qq[Table "$procedure_name" does not exist] ) unless
331 exists $self->{'procedures'}{ $procedure_name };
332 return $self->{'procedures'}{ $procedure_name };
335 # ----------------------------------------------------------------------
340 =head2 get_procedures
342 Returns all the procedures as an array or array reference.
344 my @procedures = $schema->get_procedures;
351 sort { $a->[0] <=> $b->[0] }
352 map { [ $_->order, $_ ] }
353 values %{ $self->{'procedures'} };
356 return wantarray ? @procedures : \@procedures;
359 $self->error('No procedures');
360 return wantarray ? () : undef;
364 # ----------------------------------------------------------------------
371 Returns a table by the name provided.
373 my $table = $schema->get_table('foo');
378 my $table_name = shift or return $self->error('No table name');
379 return $self->error( qq[Table "$table_name" does not exist] ) unless
380 exists $self->{'tables'}{ $table_name };
381 return $self->{'tables'}{ $table_name };
384 # ----------------------------------------------------------------------
391 Returns all the tables as an array or array reference.
393 my @tables = $schema->get_tables;
400 sort { $a->[0] <=> $b->[0] }
401 map { [ $_->order, $_ ] }
402 values %{ $self->{'tables'} };
405 return wantarray ? @tables : \@tables;
408 $self->error('No tables');
409 return wantarray ? () : undef;
413 # ----------------------------------------------------------------------
420 Returns a trigger by the name provided.
422 my $trigger = $schema->get_trigger('foo');
427 my $trigger_name = shift or return $self->error('No trigger name');
428 return $self->error( qq[Table "$trigger_name" does not exist] ) unless
429 exists $self->{'triggers'}{ $trigger_name };
430 return $self->{'triggers'}{ $trigger_name };
433 # ----------------------------------------------------------------------
440 Returns all the triggers as an array or array reference.
442 my @triggers = $schema->get_triggers;
449 sort { $a->[0] <=> $b->[0] }
450 map { [ $_->order, $_ ] }
451 values %{ $self->{'triggers'} };
454 return wantarray ? @triggers : \@triggers;
457 $self->error('No triggers');
458 return wantarray ? () : undef;
462 # ----------------------------------------------------------------------
469 Returns a view by the name provided.
471 my $view = $schema->get_view('foo');
476 my $view_name = shift or return $self->error('No view name');
477 return $self->error('View "$view_name" does not exist') unless
478 exists $self->{'views'}{ $view_name };
479 return $self->{'views'}{ $view_name };
482 # ----------------------------------------------------------------------
489 Returns all the views as an array or array reference.
491 my @views = $schema->get_views;
498 sort { $a->[0] <=> $b->[0] }
499 map { [ $_->order, $_ ] }
500 values %{ $self->{'views'} };
503 return wantarray ? @views : \@views;
506 $self->error('No views');
507 return wantarray ? () : undef;
511 # ----------------------------------------------------------------------
512 sub make_natural_joins {
516 =head2 make_natural_joins
518 Creates foriegn key relationships among like-named fields in different
519 tables. Accepts the following arguments:
525 A True or False argument which determins whether or not to perform
526 the joins from primary keys to fields of the same name in other tables
530 A list of fields to skip in the joins
534 $schema->make_natural_joins(
536 skip_fields => 'name,department_id',
543 my $join_pk_only = $args{'join_pk_only'} || 0;
544 my %skip_fields = map { s/^\s+|\s+$//g; $_, 1 } @{
545 parse_list_arg( $args{'skip_fields'} )
548 my ( %common_keys, %pk );
549 for my $table ( $self->get_tables ) {
550 for my $field ( $table->get_fields ) {
551 my $field_name = $field->name or next;
552 next if $skip_fields{ $field_name };
553 $pk{ $field_name } = 1 if $field->is_primary_key;
554 push @{ $common_keys{ $field_name } }, $table->name;
558 for my $field ( keys %common_keys ) {
559 next if $join_pk_only and !defined $pk{ $field };
561 my @table_names = @{ $common_keys{ $field } };
562 next unless scalar @table_names > 1;
564 for my $i ( 0 .. $#table_names ) {
565 my $table1 = $self->get_table( $table_names[ $i ] ) or next;
567 for my $j ( 1 .. $#table_names ) {
568 my $table2 = $self->get_table( $table_names[ $j ] ) or next;
569 next if $table1->name eq $table2->name;
571 $table1->add_constraint(
574 reference_table => $table2->name,
575 reference_fields => $field,
584 # ----------------------------------------------------------------------
591 Get or set the schema's name. (optional)
593 my $schema_name = $schema->name('Foo Database');
598 $self->{'name'} = shift if @_;
599 return $self->{'name'} || '';
608 return $self->{'parser_args'};
617 return $self->{'producer_args'};
620 # ----------------------------------------------------------------------
623 undef $_ for values %{ $self->{'tables'} };
624 undef $_ for values %{ $self->{'views'} };
629 # ----------------------------------------------------------------------
635 Ken Y. Clark E<lt>kclark@cpan.orgE<gt>