X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSQL%2FTranslator%2FSchema%2FTable.pm;h=67fdb177b8e70723533ea7c41edd9f9874c8c11d;hb=0c04c5a2210135419771878dc7e341a1cba52cca;hp=196b1590b16553818238f59a1ddcfa6473c0f4a5;hpb=dfdb0568799f5397430e66578233b46933791034;p=dbsrgits%2FSQL-Translator.git diff --git a/lib/SQL/Translator/Schema/Table.pm b/lib/SQL/Translator/Schema/Table.pm index 196b159..67fdb17 100644 --- a/lib/SQL/Translator/Schema/Table.pm +++ b/lib/SQL/Translator/Schema/Table.pm @@ -1,25 +1,5 @@ package SQL::Translator::Schema::Table; -# ---------------------------------------------------------------------- -# $Id: Table.pm,v 1.6 2003-06-06 00:10:32 kycl4rk Exp $ -# ---------------------------------------------------------------------- -# Copyright (C) 2003 Ken Y. Clark -# -# This program is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public License as -# published by the Free Software Foundation; version 2. -# -# This program is distributed in the hope that it will be useful, but -# WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -# General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA -# 02111-1307 USA -# ------------------------------------------------------------------- - =pod =head1 NAME @@ -40,20 +20,28 @@ C is the table object. =cut use strict; -use Class::Base; +use warnings; use SQL::Translator::Utils 'parse_list_arg'; use SQL::Translator::Schema::Constants; use SQL::Translator::Schema::Constraint; use SQL::Translator::Schema::Field; use SQL::Translator::Schema::Index; +use Data::Dumper; + +use base 'SQL::Translator::Schema::Object'; -use base 'Class::Base'; -use vars qw( $VERSION $FIELD_ORDER ); +our $VERSION = '1.59'; -$VERSION = 1.00; +# Stringify to our name, being careful not to pass any args through so we don't +# accidentally set it to undef. We also have to tweak bool so the object is +# still true when it doesn't have a name (which shouldn't happen!). +use overload + '""' => sub { shift->name }, + 'bool' => sub { $_[0]->name || $_[0] }, + fallback => 1, +; -# ---------------------------------------------------------------------- -sub init { +__PACKAGE__->_attributes( qw/schema name comments options order/ ); =pod @@ -61,37 +49,38 @@ sub init { Object constructor. - my $table = SQL::Translator::Schema::Table->new( + my $table = SQL::Translator::Schema::Table->new( schema => $schema, name => 'foo', ); =cut - my ( $self, $config ) = @_; - - for my $arg ( qw[ schema name ] ) { - next unless defined $config->{ $arg }; - $self->$arg( $config->{ $arg } ) or return; - } +sub new { + my $class = shift; + my $self = $class->SUPER::new (@_) + or return; + + $self->{_order} = { map { $_ => 0 } qw/ + field + /}; - return $self; + return $self; } -# ---------------------------------------------------------------------- sub add_constraint { =pod =head2 add_constraint -Add a constraint to the table. Returns the newly created +Add a constraint to the table. Returns the newly created C object. - my $c1 = $table->add_constraint( - name => 'pk', - type => PRIMARY_KEY, - fields => [ 'foo_id' ], + my $c1 = $table->add_constraint( + name => 'pk', + type => PRIMARY_KEY, + fields => [ 'foo_id' ], ); my $c2 = SQL::Translator::Schema::Constraint->new( name => 'uniq' ); @@ -110,39 +99,52 @@ C object. else { my %args = @_; $args{'table'} = $self; - $constraint = $constraint_class->new( \%args ) or - return $self->error( $constraint_class->error ); + $constraint = $constraint_class->new( \%args ) or + return $self->error( $constraint_class->error ); } # # If we're trying to add a PK when one is already defined, # then just add the fields to the existing definition. # - my $ok = 0; + my $ok = 1; my $pk = $self->primary_key; if ( $pk && $constraint->type eq PRIMARY_KEY ) { $self->primary_key( $constraint->fields ); + $pk->name($constraint->name) if $constraint->name; + my %extra = $constraint->extra; + $pk->extra(%extra) if keys %extra; $constraint = $pk; + $ok = 0; } - else { - my @field_names = $constraint->fields; - $ok = 1; - - for my $c ( - grep { $_->type eq $constraint->type } - $self->get_constraints - ) { - my %fields = map { $_, 1 } $c->fields; - for my $field_name ( @field_names ) { - if ( $fields{ $field_name } ) { - $constraint = $c; - $ok = 0; - last; - } + elsif ( $constraint->type eq PRIMARY_KEY ) { + for my $fname ( $constraint->fields ) { + if ( my $f = $self->get_field( $fname ) ) { + $f->is_primary_key( 1 ); } - last unless $ok; } } + # + # See if another constraint of the same type + # covers the same fields. -- This doesn't work! ky + # +# elsif ( $constraint->type ne CHECK_C ) { +# my @field_names = $constraint->fields; +# for my $c ( +# grep { $_->type eq $constraint->type } +# $self->get_constraints +# ) { +# my %fields = map { $_, 1 } $c->fields; +# for my $field_name ( @field_names ) { +# if ( $fields{ $field_name } ) { +# $constraint = $c; +# $ok = 0; +# last; +# } +# } +# last unless $ok; +# } +# } if ( $ok ) { push @{ $self->{'constraints'} }, $constraint; @@ -151,7 +153,42 @@ C object. return $constraint; } -# ---------------------------------------------------------------------- +sub drop_constraint { + +=pod + +=head2 drop_constraint + +Remove a constraint from the table. Returns the constraint object if the index +was found and removed, an error otherwise. The single parameter can be either +an index name or an C object. + + $table->drop_constraint('myconstraint'); + +=cut + + my $self = shift; + my $constraint_class = 'SQL::Translator::Schema::Constraint'; + my $constraint_name; + + if ( UNIVERSAL::isa( $_[0], $constraint_class ) ) { + $constraint_name = shift->name; + } + else { + $constraint_name = shift; + } + + if ( ! grep { $_->name eq $constraint_name } @ { $self->{'constraints'} } ) { + return $self->error(qq[Can't drop constraint: "$constraint_name" doesn't exist]); + } + + my @cs = @{ $self->{'constraints'} }; + my ($constraint_id) = grep { $cs[$_]->name eq $constraint_name } (0..$#cs); + my $constraint = splice(@{$self->{'constraints'}}, $constraint_id, 1); + + return $constraint; +} + sub add_index { =pod @@ -161,7 +198,7 @@ sub add_index { Add an index to the table. Returns the newly created C object. - my $i1 = $table->add_index( + my $i1 = $table->add_index( name => 'name', fields => [ 'name' ], type => 'normal', @@ -183,15 +220,52 @@ C object. else { my %args = @_; $args{'table'} = $self; - $index = $index_class->new( \%args ) or return + $index = $index_class->new( \%args ) or return $self->error( $index_class->error ); } - + foreach my $ex_index ($self->get_indices) { + return if ($ex_index->equals($index)); + } push @{ $self->{'indices'} }, $index; return $index; } -# ---------------------------------------------------------------------- +sub drop_index { + +=pod + +=head2 drop_index + +Remove an index from the table. Returns the index object if the index was +found and removed, an error otherwise. The single parameter can be either +an index name of an C object. + + $table->drop_index('myindex'); + +=cut + + my $self = shift; + my $index_class = 'SQL::Translator::Schema::Index'; + my $index_name; + + if ( UNIVERSAL::isa( $_[0], $index_class ) ) { + $index_name = shift->name; + } + else { + $index_name = shift; + } + + if ( ! grep { $_->name eq $index_name } @{ $self->{'indices'} }) { + return $self->error(qq[Can't drop index: "$index_name" doesn't exist]); + } + + my @is = @{ $self->{'indices'} }; + my ($index_id) = grep { $is[$_]->name eq $index_name } (0..$#is); + my $index = splice(@{$self->{'indices'}}, $index_id, 1); + + return $index; +} + sub add_field { =pod @@ -199,21 +273,21 @@ sub add_field { =head2 add_field Add an field to the table. Returns the newly created -C object. The "name" parameter is -required. If you try to create a field with the same name as an +C object. The "name" parameter is +required. If you try to create a field with the same name as an existing field, you will get an error and the field will not be created. - my $f1 = $table->add_field( + my $f1 = $table->add_field( name => 'foo_id', data_type => 'integer', size => 11, ); - my $f2 = SQL::Translator::Schema::Field->new( - name => 'name', + my $f2 = SQL::Translator::Schema::Field->new( + name => 'name', table => $table, ); - $f2 = $table->add_field( $field2 ) or die $table->error; + $f2 = $table->add_field( $field2 ) or die $table->error; =cut @@ -228,14 +302,15 @@ existing field, you will get an error and the field will not be created. else { my %args = @_; $args{'table'} = $self; - $field = $field_class->new( \%args ) or return + $field = $field_class->new( \%args ) or return $self->error( $field_class->error ); } - $field->order( ++$FIELD_ORDER ); - my $field_name = $field->name or return $self->error('No name'); + $field->order( ++$self->{_order}{field} ); + # We know we have a name as the Field->new above errors if none given. + my $field_name = $field->name; - if ( exists $self->{'fields'}{ $field_name } ) { + if ( exists $self->{'fields'}{ $field_name } ) { return $self->error(qq[Can't create field: "$field_name" exists]); } else { @@ -245,7 +320,94 @@ existing field, you will get an error and the field will not be created. return $field; } -# ---------------------------------------------------------------------- +sub drop_field { + +=pod + +=head2 drop_field + +Remove a field from the table. Returns the field object if the field was +found and removed, an error otherwise. The single parameter can be either +a field name or an C object. + + $table->drop_field('myfield'); + +=cut + + my $self = shift; + my $field_class = 'SQL::Translator::Schema::Field'; + my $field_name; + + if ( UNIVERSAL::isa( $_[0], $field_class ) ) { + $field_name = shift->name; + } + else { + $field_name = shift; + } + my %args = @_; + my $cascade = $args{'cascade'}; + + if ( ! exists $self->{'fields'}{ $field_name } ) { + return $self->error(qq[Can't drop field: "$field_name" doesn't exists]); + } + + my $field = delete $self->{'fields'}{ $field_name }; + + if ( $cascade ) { + # Remove this field from all indices using it + foreach my $i ($self->get_indices()) { + my @fs = $i->fields(); + @fs = grep { $_ ne $field->name } @fs; + $i->fields(@fs); + } + + # Remove this field from all constraints using it + foreach my $c ($self->get_constraints()) { + my @cs = $c->fields(); + @cs = grep { $_ ne $field->name } @cs; + $c->fields(@cs); + } + } + + return $field; +} + +sub comments { + +=pod + +=head2 comments + +Get or set the comments on a table. May be called several times to +set and it will accumulate the comments. Called in an array context, +returns each comment individually; called in a scalar context, returns +all the comments joined on newlines. + + $table->comments('foo'); + $table->comments('bar'); + print join( ', ', $table->comments ); # prints "foo, bar" + +=cut + + my $self = shift; + my @comments = ref $_[0] ? @{ $_[0] } : @_; + + for my $arg ( @comments ) { + $arg = $arg->[0] if ref $arg; + push @{ $self->{'comments'} }, $arg if defined $arg && $arg; + } + + if ( @{ $self->{'comments'} || [] } ) { + return wantarray + ? @{ $self->{'comments'} } + : join( "\n", @{ $self->{'comments'} } ) + ; + } + else { + return wantarray ? () : undef; + } +} + sub get_constraints { =pod @@ -261,7 +423,7 @@ Returns all the constraint objects as an array or array reference. my $self = shift; if ( ref $self->{'constraints'} ) { - return wantarray + return wantarray ? @{ $self->{'constraints'} } : $self->{'constraints'}; } else { @@ -270,7 +432,6 @@ Returns all the constraint objects as an array or array reference. } } -# ---------------------------------------------------------------------- sub get_indices { =pod @@ -286,8 +447,8 @@ Returns all the index objects as an array or array reference. my $self = shift; if ( ref $self->{'indices'} ) { - return wantarray - ? @{ $self->{'indices'} } + return wantarray + ? @{ $self->{'indices'} } : $self->{'indices'}; } else { @@ -296,7 +457,6 @@ Returns all the index objects as an array or array reference. } } -# ---------------------------------------------------------------------- sub get_field { =pod @@ -311,12 +471,19 @@ Returns a field by the name provided. my $self = shift; my $field_name = shift or return $self->error('No field name'); + my $case_insensitive = shift; + if ( $case_insensitive ) { + $field_name = uc($field_name); + foreach my $field ( keys %{$self->{fields}} ) { + return $self->{fields}{$field} if $field_name eq uc($field); + } + return $self->error(qq[Field "$field_name" does not exist]); + } return $self->error( qq[Field "$field_name" does not exist] ) unless exists $self->{'fields'}{ $field_name }; return $self->{'fields'}{ $field_name }; } -# ---------------------------------------------------------------------- sub get_fields { =pod @@ -330,7 +497,7 @@ Returns all the field objects as an array or array reference. =cut my $self = shift; - my @fields = + my @fields = map { $_->[1] } sort { $a->[0] <=> $b->[0] } map { [ $_->order, $_ ] } @@ -345,7 +512,6 @@ Returns all the field objects as an array or array reference. } } -# ---------------------------------------------------------------------- sub is_valid { =pod @@ -362,8 +528,8 @@ Determine whether the view is valid or not. return $self->error('No name') unless $self->name; return $self->error('No fields') unless $self->get_fields; - for my $object ( - $self->get_fields, $self->get_indices, $self->get_constraints + for my $object ( + $self->get_fields, $self->get_indices, $self->get_constraints ) { return $object->error unless $object->is_valid; } @@ -371,7 +537,156 @@ Determine whether the view is valid or not. return 1; } -# ---------------------------------------------------------------------- +sub is_trivial_link { + +=pod + +=head2 is_trivial_link + +True if table has no data (non-key) fields and only uses single key joins. + +=cut + + my $self = shift; + return 0 if $self->is_data; + return $self->{'is_trivial_link'} if defined $self->{'is_trivial_link'}; + + $self->{'is_trivial_link'} = 1; + + my %fk = (); + + foreach my $field ( $self->get_fields ) { + next unless $field->is_foreign_key; + $fk{$field->foreign_key_reference->reference_table}++; + } + + foreach my $referenced (keys %fk){ + if($fk{$referenced} > 1){ + $self->{'is_trivial_link'} = 0; + last; + } + } + + return $self->{'is_trivial_link'}; + +} + +sub is_data { + +=pod + +=head2 is_data + +Returns true if the table has some non-key fields. + +=cut + + my $self = shift; + return $self->{'is_data'} if defined $self->{'is_data'}; + + $self->{'is_data'} = 0; + + foreach my $field ( $self->get_fields ) { + if ( !$field->is_primary_key and !$field->is_foreign_key ) { + $self->{'is_data'} = 1; + return $self->{'is_data'}; + } + } + + return $self->{'is_data'}; +} + +sub can_link { + +=pod + +=head2 can_link + +Determine whether the table can link two arg tables via many-to-many. + + my $ok = $table->can_link($table1,$table2); + +=cut + + my ( $self, $table1, $table2 ) = @_; + + return $self->{'can_link'}{ $table1->name }{ $table2->name } + if defined $self->{'can_link'}{ $table1->name }{ $table2->name }; + + if ( $self->is_data == 1 ) { + $self->{'can_link'}{ $table1->name }{ $table2->name } = [0]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = [0]; + return $self->{'can_link'}{ $table1->name }{ $table2->name }; + } + + my %fk = (); + + foreach my $field ( $self->get_fields ) { + if ( $field->is_foreign_key ) { + push @{ $fk{ $field->foreign_key_reference->reference_table } }, + $field->foreign_key_reference; + } + } + + if ( !defined( $fk{ $table1->name } ) or !defined( $fk{ $table2->name } ) ) + { + $self->{'can_link'}{ $table1->name }{ $table2->name } = [0]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = [0]; + return $self->{'can_link'}{ $table1->name }{ $table2->name }; + } + + # trivial traversal, only one way to link the two tables + if ( scalar( @{ $fk{ $table1->name } } == 1 ) + and scalar( @{ $fk{ $table2->name } } == 1 ) ) + { + $self->{'can_link'}{ $table1->name }{ $table2->name } = + [ 'one2one', $fk{ $table1->name }, $fk{ $table2->name } ]; + $self->{'can_link'}{ $table1->name }{ $table2->name } = + [ 'one2one', $fk{ $table2->name }, $fk{ $table1->name } ]; + + # non-trivial traversal. one way to link table2, + # many ways to link table1 + } + elsif ( scalar( @{ $fk{ $table1->name } } > 1 ) + and scalar( @{ $fk{ $table2->name } } == 1 ) ) + { + $self->{'can_link'}{ $table1->name }{ $table2->name } = + [ 'many2one', $fk{ $table1->name }, $fk{ $table2->name } ]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = + [ 'one2many', $fk{ $table2->name }, $fk{ $table1->name } ]; + + # non-trivial traversal. one way to link table1, + # many ways to link table2 + } + elsif ( scalar( @{ $fk{ $table1->name } } == 1 ) + and scalar( @{ $fk{ $table2->name } } > 1 ) ) + { + $self->{'can_link'}{ $table1->name }{ $table2->name } = + [ 'one2many', $fk{ $table1->name }, $fk{ $table2->name } ]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = + [ 'many2one', $fk{ $table2->name }, $fk{ $table1->name } ]; + + # non-trivial traversal. many ways to link table1 and table2 + } + elsif ( scalar( @{ $fk{ $table1->name } } > 1 ) + and scalar( @{ $fk{ $table2->name } } > 1 ) ) + { + $self->{'can_link'}{ $table1->name }{ $table2->name } = + [ 'many2many', $fk{ $table1->name }, $fk{ $table2->name } ]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = + [ 'many2many', $fk{ $table2->name }, $fk{ $table1->name } ]; + + # one of the tables didn't export a key + # to this table, no linking possible + } + else { + $self->{'can_link'}{ $table1->name }{ $table2->name } = [0]; + $self->{'can_link'}{ $table2->name }{ $table1->name } = [0]; + } + + return $self->{'can_link'}{ $table1->name }{ $table2->name }; +} + sub name { =pod @@ -380,8 +695,11 @@ sub name { Get or set the table's name. -If provided an argument, checks the schema object for a table of -that name and disallows the change if one exists. +Errors ("No table name") if you try to set a blank name. + +If provided an argument, checks the schema object for a table of +that name and disallows the change if one exists (setting the error to +"Can't use table name "%s": table exists"). my $table_name = $table->name('foo'); @@ -389,7 +707,8 @@ that name and disallows the change if one exists. my $self = shift; - if ( my $arg = shift ) { + if ( @_ ) { + my $arg = shift || return $self->error( "No table name" ); if ( my $schema = $self->schema ) { return $self->error( qq[Can't use table name "$arg": table exists] ) if $schema->get_table( $arg ); @@ -400,7 +719,6 @@ that name and disallows the change if one exists. return $self->{'name'} || ''; } -# ---------------------------------------------------------------------- sub schema { =pod @@ -423,12 +741,11 @@ Get or set the table's schema object. return $self->{'schema'}; } -# ---------------------------------------------------------------------- sub primary_key { =pod -=head2 options +=head2 primary_key Gets or sets the table's primary key(s). Takes one or more field names (as a string, list or array[ref]) as an argument. If the field @@ -456,7 +773,7 @@ These are eqivalent: my $constraint; if ( @$fields ) { for my $f ( @$fields ) { - return $self->error(qq[Invalid field "$f"]) unless + return $self->error(qq[Invalid field "$f"]) unless $self->get_field($f); } @@ -466,14 +783,14 @@ These are eqivalent: $has_pk = 1; $c->fields( @{ $c->fields }, @$fields ); $constraint = $c; - } + } } unless ( $has_pk ) { $constraint = $self->add_constraint( type => PRIMARY_KEY, fields => $fields, - ); + ) or return; } } @@ -489,7 +806,6 @@ These are eqivalent: return; } -# ---------------------------------------------------------------------- sub options { =pod @@ -509,14 +825,13 @@ an array or array reference. push @{ $self->{'options'} }, @$options; if ( ref $self->{'options'} ) { - return wantarray ? @{ $self->{'options'} || [] } : $self->{'options'}; + return wantarray ? @{ $self->{'options'} || [] } : ($self->{'options'} || ''); } else { return wantarray ? () : []; } } -# ---------------------------------------------------------------------- sub order { =pod @@ -538,7 +853,207 @@ Get or set the table's order. return $self->{'order'} || 0; } -# ---------------------------------------------------------------------- +sub field_names { + +=head2 field_names + +Read-only method to return a list or array ref of the field names. Returns undef +or an empty list if the table has no fields set. Useful if you want to +avoid the overload magic of the Field objects returned by the get_fields method. + + my @names = $constraint->field_names; + +=cut + + my $self = shift; + my @fields = + map { $_->name } + sort { $a->order <=> $b->order } + values %{ $self->{'fields'} || {} }; + + if ( @fields ) { + return wantarray ? @fields : \@fields; + } + else { + $self->error('No fields'); + return wantarray ? () : undef; + } +} + +sub equals { + +=pod + +=head2 equals + +Determines if this table is the same as another + + my $isIdentical = $table1->equals( $table2 ); + +=cut + + my $self = shift; + my $other = shift; + my $case_insensitive = shift; + + return 0 unless $self->SUPER::equals($other); + return 0 unless $case_insensitive ? uc($self->name) eq uc($other->name) : $self->name eq $other->name; + return 0 unless $self->_compare_objects(scalar $self->options, scalar $other->options); + return 0 unless $self->_compare_objects(scalar $self->extra, scalar $other->extra); + + # Fields + # Go through our fields + my %checkedFields; + foreach my $field ( $self->get_fields ) { + my $otherField = $other->get_field($field->name, $case_insensitive); + return 0 unless $field->equals($otherField, $case_insensitive); + $checkedFields{$field->name} = 1; + } + # Go through the other table's fields + foreach my $otherField ( $other->get_fields ) { + next if $checkedFields{$otherField->name}; + return 0; + } + + # Constraints + # Go through our constraints + my %checkedConstraints; +CONSTRAINT: + foreach my $constraint ( $self->get_constraints ) { + foreach my $otherConstraint ( $other->get_constraints ) { + if ( $constraint->equals($otherConstraint, $case_insensitive) ) { + $checkedConstraints{$otherConstraint} = 1; + next CONSTRAINT; + } + } + return 0; + } + # Go through the other table's constraints +CONSTRAINT2: + foreach my $otherConstraint ( $other->get_constraints ) { + next if $checkedFields{$otherConstraint}; + foreach my $constraint ( $self->get_constraints ) { + if ( $otherConstraint->equals($constraint, $case_insensitive) ) { + next CONSTRAINT2; + } + } + return 0; + } + + # Indices + # Go through our indices + my %checkedIndices; +INDEX: + foreach my $index ( $self->get_indices ) { + foreach my $otherIndex ( $other->get_indices ) { + if ( $index->equals($otherIndex, $case_insensitive) ) { + $checkedIndices{$otherIndex} = 1; + next INDEX; + } + } + return 0; + } + # Go through the other table's indices +INDEX2: + foreach my $otherIndex ( $other->get_indices ) { + next if $checkedIndices{$otherIndex}; + foreach my $index ( $self->get_indices ) { + if ( $otherIndex->equals($index, $case_insensitive) ) { + next INDEX2; + } + } + return 0; + } + + return 1; +} + +=head1 LOOKUP METHODS + +The following are a set of shortcut methods for getting commonly used lists of +fields and constraints. They all return lists or array refs of Field or +Constraint objects. + +=over 4 + +=item pkey_fields + +The primary key fields. + +=item fkey_fields + +All foreign key fields. + +=item nonpkey_fields + +All the fields except the primary key. + +=item data_fields + +All non key fields. + +=item unique_fields + +All fields with unique constraints. + +=item unique_constraints + +All this tables unique constraints. + +=item fkey_constraints + +All this tables foreign key constraints. (See primary_key method to get the +primary key constraint) + +=back + +=cut + +sub pkey_fields { + my $me = shift; + my @fields = grep { $_->is_primary_key } $me->get_fields; + return wantarray ? @fields : \@fields; +} + +sub fkey_fields { + my $me = shift; + my @fields; + push @fields, $_->fields foreach $me->fkey_constraints; + return wantarray ? @fields : \@fields; +} + +sub nonpkey_fields { + my $me = shift; + my @fields = grep { !$_->is_primary_key } $me->get_fields; + return wantarray ? @fields : \@fields; +} + +sub data_fields { + my $me = shift; + my @fields = + grep { !$_->is_foreign_key and !$_->is_primary_key } $me->get_fields; + return wantarray ? @fields : \@fields; +} + +sub unique_fields { + my $me = shift; + my @fields; + push @fields, $_->fields foreach $me->unique_constraints; + return wantarray ? @fields : \@fields; +} + +sub unique_constraints { + my $me = shift; + my @cons = grep { $_->type eq UNIQUE } $me->get_constraints; + return wantarray ? @cons : \@cons; +} + +sub fkey_constraints { + my $me = shift; + my @cons = grep { $_->type eq FOREIGN_KEY } $me->get_constraints; + return wantarray ? @cons : \@cons; +} + sub DESTROY { my $self = shift; undef $self->{'schema'}; # destroy cyclical reference @@ -549,12 +1064,11 @@ sub DESTROY { 1; -# ---------------------------------------------------------------------- - =pod -=head1 AUTHOR +=head1 AUTHORS -Ken Y. Clark Ekclark@cpan.orgE +Ken Youens-Clark Ekclark@cpan.orgE, +Allen Day Eallenday@ucla.eduE. =cut