1 package SQL::Translator::Schema;
7 SQL::Translator::Schema - SQL::Translator schema object
11 use SQL::Translator::Schema;
12 my $schema = SQL::Translator::Schema->new(
16 my $table = $schema->add_table( name => 'foo' );
17 my $view = $schema->add_view( name => 'bar', sql => '...' );
22 C<SQL::Translator::Schema> is the object that accepts, validates, and
23 returns the database structure.
31 use SQL::Translator::Schema::Constants;
32 use SQL::Translator::Schema::Procedure;
33 use SQL::Translator::Schema::Table;
34 use SQL::Translator::Schema::Trigger;
35 use SQL::Translator::Schema::View;
37 use SQL::Translator::Utils 'parse_list_arg';
39 use base 'SQL::Translator::Schema::Object';
40 use vars qw[ $VERSION ];
44 __PACKAGE__->_attributes(qw/name database translator/);
48 my $self = $class->SUPER::new (@_)
51 $self->{_order} = { map { $_ => 0 } qw/
67 Returns the schema as an L<SQL::Translator::Schema::Graph> object.
70 require SQL::Translator::Schema::Graph;
74 return SQL::Translator::Schema::Graph->new(
75 translator => $self->translator );
84 Returns a Graph::Directed object with the table names for nodes.
88 require Graph::Directed;
91 my $g = Graph::Directed->new;
93 for my $table ( $self->get_tables ) {
94 my $tname = $table->name;
95 $g->add_vertex( $tname );
97 for my $field ( $table->get_fields ) {
98 if ( $field->is_foreign_key ) {
99 my $fktable = $field->foreign_key_reference->reference_table;
101 $g->add_edge( $fktable, $tname );
115 Add a table object. Returns the new SQL::Translator::Schema::Table object.
116 The "name" parameter is required. If you try to create a table with the
117 same name as an existing table, you will get an error and the table will
120 my $t1 = $schema->add_table( name => 'foo' ) or die $schema->error;
121 my $t2 = SQL::Translator::Schema::Table->new( name => 'bar' );
122 $t2 = $schema->add_table( $table_bar ) or die $schema->error;
127 my $table_class = 'SQL::Translator::Schema::Table';
130 if ( UNIVERSAL::isa( $_[0], $table_class ) ) {
132 $table->schema($self);
135 my %args = ref $_[0] eq 'HASH' ? %{ $_[0] } : @_;
136 $args{'schema'} = $self;
137 $table = $table_class->new( \%args )
138 or return $self->error( $table_class->error );
141 $table->order( ++$self->{_order}{table} );
143 # We know we have a name as the Table->new above errors if none given.
144 my $table_name = $table->name;
146 if ( defined $self->{'tables'}{$table_name} ) {
147 return $self->error(qq[Can't create table: "$table_name" exists]);
150 $self->{'tables'}{$table_name} = $table;
162 Remove a table from the schema. Returns the table object if the table was found
163 and removed, an error otherwise. The single parameter can be either a table
164 name or an C<SQL::Translator::Schema::Table> object. The "cascade" parameter
165 can be set to 1 to also drop all triggers on the table, default is 0.
167 $schema->drop_table('mytable');
168 $schema->drop_table('mytable', cascade => 1);
173 my $table_class = 'SQL::Translator::Schema::Table';
176 if ( UNIVERSAL::isa( $_[0], $table_class ) ) {
177 $table_name = shift->name;
183 my $cascade = $args{'cascade'};
185 if ( !exists $self->{'tables'}{$table_name} ) {
186 return $self->error(qq[Can't drop table: $table_name" doesn't exist]);
189 my $table = delete $self->{'tables'}{$table_name};
193 # Drop all triggers on this table
194 $self->drop_trigger()
195 for ( grep { $_->on_table eq $table_name } @{ $self->{'triggers'} } );
206 Add a procedure object. Returns the new SQL::Translator::Schema::Procedure
207 object. The "name" parameter is required. If you try to create a procedure
208 with the same name as an existing procedure, you will get an error and the
209 procedure will not be created.
211 my $p1 = $schema->add_procedure( name => 'foo' );
212 my $p2 = SQL::Translator::Schema::Procedure->new( name => 'bar' );
213 $p2 = $schema->add_procedure( $procedure_bar ) or die $schema->error;
218 my $procedure_class = 'SQL::Translator::Schema::Procedure';
221 if ( UNIVERSAL::isa( $_[0], $procedure_class ) ) {
223 $procedure->schema($self);
226 my %args = ref $_[0] eq 'HASH' ? %{ $_[0] } : @_;
227 $args{'schema'} = $self;
228 return $self->error('No procedure name') unless $args{'name'};
229 $procedure = $procedure_class->new( \%args )
230 or return $self->error( $procedure_class->error );
233 $procedure->order( ++$self->{_order}{proc} );
234 my $procedure_name = $procedure->name
235 or return $self->error('No procedure name');
237 if ( defined $self->{'procedures'}{$procedure_name} ) {
239 qq[Can't create procedure: "$procedure_name" exists] );
242 $self->{'procedures'}{$procedure_name} = $procedure;
252 =head2 drop_procedure
254 Remove a procedure from the schema. Returns the procedure object if the
255 procedure was found and removed, an error otherwise. The single parameter
256 can be either a procedure name or an C<SQL::Translator::Schema::Procedure>
259 $schema->drop_procedure('myprocedure');
264 my $proc_class = 'SQL::Translator::Schema::Procedure';
267 if ( UNIVERSAL::isa( $_[0], $proc_class ) ) {
268 $proc_name = shift->name;
274 if ( !exists $self->{'procedures'}{$proc_name} ) {
276 qq[Can't drop procedure: $proc_name" doesn't exist]);
279 my $proc = delete $self->{'procedures'}{$proc_name};
290 Add a trigger object. Returns the new SQL::Translator::Schema::Trigger object.
291 The "name" parameter is required. If you try to create a trigger with the
292 same name as an existing trigger, you will get an error and the trigger will
295 my $t1 = $schema->add_trigger( name => 'foo' );
296 my $t2 = SQL::Translator::Schema::Trigger->new( name => 'bar' );
297 $t2 = $schema->add_trigger( $trigger_bar ) or die $schema->error;
302 my $trigger_class = 'SQL::Translator::Schema::Trigger';
305 if ( UNIVERSAL::isa( $_[0], $trigger_class ) ) {
307 $trigger->schema($self);
310 my %args = ref $_[0] eq 'HASH' ? %{ $_[0] } : @_;
311 $args{'schema'} = $self;
312 return $self->error('No trigger name') unless $args{'name'};
313 $trigger = $trigger_class->new( \%args )
314 or return $self->error( $trigger_class->error );
317 $trigger->order( ++$self->{_order}{trigger} );
319 my $trigger_name = $trigger->name or return $self->error('No trigger name');
320 if ( defined $self->{'triggers'}{$trigger_name} ) {
321 return $self->error(qq[Can't create trigger: "$trigger_name" exists]);
324 $self->{'triggers'}{$trigger_name} = $trigger;
336 Remove a trigger from the schema. Returns the trigger object if the trigger was
337 found and removed, an error otherwise. The single parameter can be either a
338 trigger name or an C<SQL::Translator::Schema::Trigger> object.
340 $schema->drop_trigger('mytrigger');
345 my $trigger_class = 'SQL::Translator::Schema::Trigger';
348 if ( UNIVERSAL::isa( $_[0], $trigger_class ) ) {
349 $trigger_name = shift->name;
352 $trigger_name = shift;
355 if ( !exists $self->{'triggers'}{$trigger_name} ) {
357 qq[Can't drop trigger: $trigger_name" doesn't exist]);
360 my $trigger = delete $self->{'triggers'}{$trigger_name};
371 Add a view object. Returns the new SQL::Translator::Schema::View object.
372 The "name" parameter is required. If you try to create a view with the
373 same name as an existing view, you will get an error and the view will
376 my $v1 = $schema->add_view( name => 'foo' );
377 my $v2 = SQL::Translator::Schema::View->new( name => 'bar' );
378 $v2 = $schema->add_view( $view_bar ) or die $schema->error;
383 my $view_class = 'SQL::Translator::Schema::View';
386 if ( UNIVERSAL::isa( $_[0], $view_class ) ) {
388 $view->schema($self);
391 my %args = ref $_[0] eq 'HASH' ? %{ $_[0] } : @_;
392 $args{'schema'} = $self;
393 return $self->error('No view name') unless $args{'name'};
394 $view = $view_class->new( \%args ) or return $view_class->error;
397 $view->order( ++$self->{_order}{view} );
398 my $view_name = $view->name or return $self->error('No view name');
400 if ( defined $self->{'views'}{$view_name} ) {
401 return $self->error(qq[Can't create view: "$view_name" exists]);
404 $self->{'views'}{$view_name} = $view;
416 Remove a view from the schema. Returns the view object if the view was found
417 and removed, an error otherwise. The single parameter can be either a view
418 name or an C<SQL::Translator::Schema::View> object.
420 $schema->drop_view('myview');
425 my $view_class = 'SQL::Translator::Schema::View';
428 if ( UNIVERSAL::isa( $_[0], $view_class ) ) {
429 $view_name = shift->name;
435 if ( !exists $self->{'views'}{$view_name} ) {
436 return $self->error(qq[Can't drop view: $view_name" doesn't exist]);
439 my $view = delete $self->{'views'}{$view_name};
450 Get or set the schema's database. (optional)
452 my $database = $schema->database('PostgreSQL');
457 $self->{'database'} = shift if @_;
458 return $self->{'database'} || '';
467 Returns true if all the tables and views are valid.
469 my $ok = $schema->is_valid or die $schema->error;
475 return $self->error('No tables') unless $self->get_tables;
477 for my $object ( $self->get_tables, $self->get_views ) {
478 return $object->error unless $object->is_valid;
490 Returns a procedure by the name provided.
492 my $procedure = $schema->get_procedure('foo');
497 my $procedure_name = shift or return $self->error('No procedure name');
498 return $self->error(qq[Table "$procedure_name" does not exist])
499 unless exists $self->{'procedures'}{$procedure_name};
500 return $self->{'procedures'}{$procedure_name};
507 =head2 get_procedures
509 Returns all the procedures as an array or array reference.
511 my @procedures = $schema->get_procedures;
518 sort { $a->[0] <=> $b->[0] }
519 map { [ $_->order, $_ ] } values %{ $self->{'procedures'} };
522 return wantarray ? @procedures : \@procedures;
525 $self->error('No procedures');
526 return wantarray ? () : undef;
536 Returns a table by the name provided.
538 my $table = $schema->get_table('foo');
543 my $table_name = shift or return $self->error('No table name');
544 my $case_insensitive = shift;
545 if ( $case_insensitive ) {
546 $table_name = uc($table_name);
547 foreach my $table ( keys %{$self->{tables}} ) {
548 return $self->{tables}{$table} if $table_name eq uc($table);
550 return $self->error(qq[Table "$table_name" does not exist]);
552 return $self->error(qq[Table "$table_name" does not exist])
553 unless exists $self->{'tables'}{$table_name};
554 return $self->{'tables'}{$table_name};
563 Returns all the tables as an array or array reference.
565 my @tables = $schema->get_tables;
572 sort { $a->[0] <=> $b->[0] }
573 map { [ $_->order, $_ ] } values %{ $self->{'tables'} };
576 return wantarray ? @tables : \@tables;
579 $self->error('No tables');
580 return wantarray ? () : undef;
590 Returns a trigger by the name provided.
592 my $trigger = $schema->get_trigger('foo');
597 my $trigger_name = shift or return $self->error('No trigger name');
598 return $self->error(qq[Table "$trigger_name" does not exist])
599 unless exists $self->{'triggers'}{$trigger_name};
600 return $self->{'triggers'}{$trigger_name};
609 Returns all the triggers as an array or array reference.
611 my @triggers = $schema->get_triggers;
618 sort { $a->[0] <=> $b->[0] }
619 map { [ $_->order, $_ ] } values %{ $self->{'triggers'} };
622 return wantarray ? @triggers : \@triggers;
625 $self->error('No triggers');
626 return wantarray ? () : undef;
636 Returns a view by the name provided.
638 my $view = $schema->get_view('foo');
643 my $view_name = shift or return $self->error('No view name');
644 return $self->error('View "$view_name" does not exist')
645 unless exists $self->{'views'}{$view_name};
646 return $self->{'views'}{$view_name};
655 Returns all the views as an array or array reference.
657 my @views = $schema->get_views;
664 sort { $a->[0] <=> $b->[0] }
665 map { [ $_->order, $_ ] } values %{ $self->{'views'} };
668 return wantarray ? @views : \@views;
671 $self->error('No views');
672 return wantarray ? () : undef;
676 sub make_natural_joins {
680 =head2 make_natural_joins
682 Creates foriegn key relationships among like-named fields in different
683 tables. Accepts the following arguments:
689 A True or False argument which determins whether or not to perform
690 the joins from primary keys to fields of the same name in other tables
694 A list of fields to skip in the joins
698 $schema->make_natural_joins(
700 skip_fields => 'name,department_id',
707 my $join_pk_only = $args{'join_pk_only'} || 0;
709 map { s/^\s+|\s+$//g; $_, 1 } @{ parse_list_arg( $args{'skip_fields'} ) };
711 my ( %common_keys, %pk );
712 for my $table ( $self->get_tables ) {
713 for my $field ( $table->get_fields ) {
714 my $field_name = $field->name or next;
715 next if $skip_fields{$field_name};
716 $pk{$field_name} = 1 if $field->is_primary_key;
717 push @{ $common_keys{$field_name} }, $table->name;
721 for my $field ( keys %common_keys ) {
722 next if $join_pk_only and !defined $pk{$field};
724 my @table_names = @{ $common_keys{$field} };
725 next unless scalar @table_names > 1;
727 for my $i ( 0 .. $#table_names ) {
728 my $table1 = $self->get_table( $table_names[$i] ) or next;
730 for my $j ( 1 .. $#table_names ) {
731 my $table2 = $self->get_table( $table_names[$j] ) or next;
732 next if $table1->name eq $table2->name;
734 $table1->add_constraint(
737 reference_table => $table2->name,
738 reference_fields => $field,
753 Get or set the schema's name. (optional)
755 my $schema_name = $schema->name('Foo Database');
760 $self->{'name'} = shift if @_;
761 return $self->{'name'} || '';
770 Get the SQL::Translator instance that instantiated the parser.
775 $self->{'translator'} = shift if @_;
776 return $self->{'translator'};
781 undef $_ for values %{ $self->{'tables'} };
782 undef $_ for values %{ $self->{'views'} };
791 Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>.