1 package SQL::Translator::Schema;
3 # ----------------------------------------------------------------------
4 # $Id: Schema.pm,v 1.19 2004-11-04 16:29:56 grommit 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.
46 use SQL::Translator::Schema::Constants;
47 use SQL::Translator::Schema::Procedure;
48 use SQL::Translator::Schema::Table;
49 use SQL::Translator::Schema::Trigger;
50 use SQL::Translator::Schema::View;
51 use SQL::Translator::Schema::Graph;
52 use SQL::Translator::Utils 'parse_list_arg';
54 use base 'SQL::Translator::Schema::Object';
55 use vars qw[ $VERSION $TABLE_ORDER $VIEW_ORDER $TRIGGER_ORDER $PROC_ORDER ];
57 $VERSION = sprintf "%d.%02d", q$Revision: 1.19 $ =~ /(\d+)\.(\d+)/;
59 # ----------------------------------------------------------------------
68 my $schema = SQL::Translator::Schema->new(
75 my ( $self, $config ) = @_;
76 $self->params( $config, qw[ name database translator ] )
83 return SQL::Translator::Schema::Graph->new(translator => $self->translator);
86 # ----------------------------------------------------------------------
93 Add a table object. Returns the new SQL::Translator::Schema::Table object.
94 The "name" parameter is required. If you try to create a table with the
95 same name as an existing table, you will get an error and the table will
98 my $t1 = $schema->add_table( name => 'foo' ) or die $schema->error;
99 my $t2 = SQL::Translator::Schema::Table->new( name => 'bar' );
100 $t2 = $schema->add_table( $table_bar ) or die $schema->error;
105 my $table_class = 'SQL::Translator::Schema::Table';
108 if ( UNIVERSAL::isa( $_[0], $table_class ) ) {
110 $table->schema( $self );
114 $args{'schema'} = $self;
115 $table = $table_class->new( \%args ) or return
116 $self->error( $table_class->error );
119 $table->order( ++$TABLE_ORDER );
120 # We know we have a name as the Table->new above errors if none given.
121 my $table_name = $table->name;
123 if ( defined $self->{'tables'}{ $table_name } ) {
124 return $self->error(qq[Can't create table: "$table_name" exists]);
127 $self->{'tables'}{ $table_name } = $table;
133 # ----------------------------------------------------------------------
140 Add a procedure object. Returns the new
141 SQL::Translator::Schema::Procedure object. The "name" parameter is
142 required. If you try to create a procedure with the same name as an
143 existing procedure, you will get an error and the procedure will not
146 my $p1 = $schema->add_procedure( name => 'foo' );
147 my $p2 = SQL::Translator::Schema::Procedure->new( name => 'bar' );
148 $p2 = $schema->add_procedure( $procedure_bar ) or die $schema->error;
153 my $procedure_class = 'SQL::Translator::Schema::Procedure';
156 if ( UNIVERSAL::isa( $_[0], $procedure_class ) ) {
158 $procedure->schema( $self );
162 $args{'schema'} = $self;
163 return $self->error('No procedure name') unless $args{'name'};
164 $procedure = $procedure_class->new( \%args ) or
165 return $self->error( $procedure_class->error );
168 $procedure->order( ++$PROC_ORDER );
169 my $procedure_name = $procedure->name or return
170 $self->error('No procedure name');
172 if ( defined $self->{'procedures'}{ $procedure_name } ) {
174 qq[Can't create procedure: "$procedure_name" exists]
178 $self->{'procedures'}{ $procedure_name } = $procedure;
184 # ----------------------------------------------------------------------
191 Add a trigger object. Returns the new SQL::Translator::Schema::Trigger object.
192 The "name" parameter is required. If you try to create a trigger with the
193 same name as an existing trigger, you will get an error and the trigger will
196 my $t1 = $schema->add_trigger( name => 'foo' );
197 my $t2 = SQL::Translator::Schema::Trigger->new( name => 'bar' );
198 $t2 = $schema->add_trigger( $trigger_bar ) or die $schema->error;
203 my $trigger_class = 'SQL::Translator::Schema::Trigger';
206 if ( UNIVERSAL::isa( $_[0], $trigger_class ) ) {
208 $trigger->schema( $self );
212 $args{'schema'} = $self;
213 return $self->error('No trigger name') unless $args{'name'};
214 $trigger = $trigger_class->new( \%args ) or
215 return $self->error( $trigger_class->error );
218 $trigger->order( ++$TRIGGER_ORDER );
219 my $trigger_name = $trigger->name or return $self->error('No trigger name');
221 if ( defined $self->{'triggers'}{ $trigger_name } ) {
222 return $self->error(qq[Can't create trigger: "$trigger_name" exists]);
225 $self->{'triggers'}{ $trigger_name } = $trigger;
231 # ----------------------------------------------------------------------
238 Add a view object. Returns the new SQL::Translator::Schema::View object.
239 The "name" parameter is required. If you try to create a view with the
240 same name as an existing view, you will get an error and the view will
243 my $v1 = $schema->add_view( name => 'foo' );
244 my $v2 = SQL::Translator::Schema::View->new( name => 'bar' );
245 $v2 = $schema->add_view( $view_bar ) or die $schema->error;
250 my $view_class = 'SQL::Translator::Schema::View';
253 if ( UNIVERSAL::isa( $_[0], $view_class ) ) {
255 $view->schema( $self );
259 $args{'schema'} = $self;
260 return $self->error('No view name') unless $args{'name'};
261 $view = $view_class->new( \%args ) or return $view_class->error;
264 $view->order( ++$VIEW_ORDER );
265 my $view_name = $view->name or return $self->error('No view name');
267 if ( defined $self->{'views'}{ $view_name } ) {
268 return $self->error(qq[Can't create view: "$view_name" exists]);
271 $self->{'views'}{ $view_name } = $view;
277 # ----------------------------------------------------------------------
284 Get or set the schema's database. (optional)
286 my $database = $schema->database('PostgreSQL');
291 $self->{'database'} = shift if @_;
292 return $self->{'database'} || '';
295 # ----------------------------------------------------------------------
302 Returns true if all the tables and views are valid.
304 my $ok = $schema->is_valid or die $schema->error;
310 return $self->error('No tables') unless $self->get_tables;
312 for my $object ( $self->get_tables, $self->get_views ) {
313 return $object->error unless $object->is_valid;
319 # ----------------------------------------------------------------------
326 Returns a procedure by the name provided.
328 my $procedure = $schema->get_procedure('foo');
333 my $procedure_name = shift or return $self->error('No procedure name');
334 return $self->error( qq[Table "$procedure_name" does not exist] ) unless
335 exists $self->{'procedures'}{ $procedure_name };
336 return $self->{'procedures'}{ $procedure_name };
339 # ----------------------------------------------------------------------
344 =head2 get_procedures
346 Returns all the procedures as an array or array reference.
348 my @procedures = $schema->get_procedures;
355 sort { $a->[0] <=> $b->[0] }
356 map { [ $_->order, $_ ] }
357 values %{ $self->{'procedures'} };
360 return wantarray ? @procedures : \@procedures;
363 $self->error('No procedures');
364 return wantarray ? () : undef;
368 # ----------------------------------------------------------------------
375 Returns a table by the name provided.
377 my $table = $schema->get_table('foo');
382 my $table_name = shift or return $self->error('No table name');
383 return $self->error( qq[Table "$table_name" does not exist] ) unless
384 exists $self->{'tables'}{ $table_name };
385 return $self->{'tables'}{ $table_name };
388 # ----------------------------------------------------------------------
395 Returns all the tables as an array or array reference.
397 my @tables = $schema->get_tables;
404 sort { $a->[0] <=> $b->[0] }
405 map { [ $_->order, $_ ] }
406 values %{ $self->{'tables'} };
409 return wantarray ? @tables : \@tables;
412 $self->error('No tables');
413 return wantarray ? () : undef;
417 # ----------------------------------------------------------------------
424 Returns a trigger by the name provided.
426 my $trigger = $schema->get_trigger('foo');
431 my $trigger_name = shift or return $self->error('No trigger name');
432 return $self->error( qq[Table "$trigger_name" does not exist] ) unless
433 exists $self->{'triggers'}{ $trigger_name };
434 return $self->{'triggers'}{ $trigger_name };
437 # ----------------------------------------------------------------------
444 Returns all the triggers as an array or array reference.
446 my @triggers = $schema->get_triggers;
453 sort { $a->[0] <=> $b->[0] }
454 map { [ $_->order, $_ ] }
455 values %{ $self->{'triggers'} };
458 return wantarray ? @triggers : \@triggers;
461 $self->error('No triggers');
462 return wantarray ? () : undef;
466 # ----------------------------------------------------------------------
473 Returns a view by the name provided.
475 my $view = $schema->get_view('foo');
480 my $view_name = shift or return $self->error('No view name');
481 return $self->error('View "$view_name" does not exist') unless
482 exists $self->{'views'}{ $view_name };
483 return $self->{'views'}{ $view_name };
486 # ----------------------------------------------------------------------
493 Returns all the views as an array or array reference.
495 my @views = $schema->get_views;
502 sort { $a->[0] <=> $b->[0] }
503 map { [ $_->order, $_ ] }
504 values %{ $self->{'views'} };
507 return wantarray ? @views : \@views;
510 $self->error('No views');
511 return wantarray ? () : undef;
515 # ----------------------------------------------------------------------
516 sub make_natural_joins {
520 =head2 make_natural_joins
522 Creates foriegn key relationships among like-named fields in different
523 tables. Accepts the following arguments:
529 A True or False argument which determins whether or not to perform
530 the joins from primary keys to fields of the same name in other tables
534 A list of fields to skip in the joins
538 $schema->make_natural_joins(
540 skip_fields => 'name,department_id',
547 my $join_pk_only = $args{'join_pk_only'} || 0;
548 my %skip_fields = map { s/^\s+|\s+$//g; $_, 1 } @{
549 parse_list_arg( $args{'skip_fields'} )
552 my ( %common_keys, %pk );
553 for my $table ( $self->get_tables ) {
554 for my $field ( $table->get_fields ) {
555 my $field_name = $field->name or next;
556 next if $skip_fields{ $field_name };
557 $pk{ $field_name } = 1 if $field->is_primary_key;
558 push @{ $common_keys{ $field_name } }, $table->name;
562 for my $field ( keys %common_keys ) {
563 next if $join_pk_only and !defined $pk{ $field };
565 my @table_names = @{ $common_keys{ $field } };
566 next unless scalar @table_names > 1;
568 for my $i ( 0 .. $#table_names ) {
569 my $table1 = $self->get_table( $table_names[ $i ] ) or next;
571 for my $j ( 1 .. $#table_names ) {
572 my $table2 = $self->get_table( $table_names[ $j ] ) or next;
573 next if $table1->name eq $table2->name;
575 $table1->add_constraint(
578 reference_table => $table2->name,
579 reference_fields => $field,
588 # ----------------------------------------------------------------------
595 Get or set the schema's name. (optional)
597 my $schema_name = $schema->name('Foo Database');
602 $self->{'name'} = shift if @_;
603 return $self->{'name'} || '';
608 get the SQL::Translator instance that instatiated me
614 $self->{'translator'} = shift if @_;
615 return $self->{'translator'};
618 # ----------------------------------------------------------------------
621 undef $_ for values %{ $self->{'tables'} };
622 undef $_ for values %{ $self->{'views'} };
627 # ----------------------------------------------------------------------
633 Ken Y. Clark E<lt>kclark@cpan.orgE<gt>