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package DBIx::Class::Schema::Loader::DBI;
use strict;
use warnings;
use base qw/DBIx::Class::Schema::Loader::Base Class::Accessor::Fast/;
use Class::C3;
use Carp::Clan qw/^DBIx::Class/;
use UNIVERSAL::require;
=head1 NAME
DBIx::Class::Schema::Loader::DBI - DBIx::Class::Schema::Loader DBI Implementation.
=head1 SYNOPSIS
See L<DBIx::Class::Schema::Loader::Base>
=head1 DESCRIPTION
This is the base class for L<DBIx::Class::Schema::Loader::Base> classes for
DBI-based storage backends, and implements the common functionality between them.
See L<DBIx::Class::Schema::Loader::Base> for the available options.
=head1 METHODS
=head2 new
Overlays L<DBIx::Class::Schema::Loader::Base/new> to do some DBI-specific
things.
=cut
sub new {
my $self = shift->next::method(@_);
# rebless to vendor-specific class if it exists and loads
my $dbh = $self->schema->storage->dbh;
my $driver = $dbh->{Driver}->{Name};
my $subclass = 'DBIx::Class::Schema::Loader::DBI::' . $driver;
$subclass->require;
if($@ && $@ !~ /^Can't locate /) {
croak "Failed to require $subclass: $@";
}
elsif(!$@) {
bless $self, "DBIx::Class::Schema::Loader::DBI::${driver}";
}
# Set up the default quoting character and name seperators
$self->{_quoter} = $self->schema->storage->sql_maker->quote_char
|| $dbh->get_info(29)
|| q{"};
$self->{_namesep} = $self->schema->storage->sql_maker->name_sep
|| $dbh->get_info(41)
|| q{.};
# For our usage as regex matches, concatenating multiple quoter
# values works fine (e.g. s/\Q<>\E// if quoter was [ '<', '>' ])
if( ref $self->{_quoter} eq 'ARRAY') {
$self->{_quoter} = join(q{}, @{$self->{_quoter}});
}
$self->_setup;
$self;
}
# Override this in vendor modules to do things at the end of ->new()
sub _setup { }
# Returns an array of table names
sub _tables_list {
my $self = shift;
my $dbh = $self->schema->storage->dbh;
my @tables = $dbh->tables(undef, $self->db_schema, '%', '%');
s/\Q$self->{_quoter}\E//g for @tables;
s/^.*\Q$self->{_namesep}\E// for @tables;
return @tables;
}
# Returns an arrayref of column names
sub _table_columns {
my ($self, $table) = @_;
my $dbh = $self->schema->storage->dbh;
if($self->{db_schema}) {
$table = $self->{db_schema} . $self->{_namesep} . $table;
}
my $sth = $dbh->prepare("SELECT * FROM $table WHERE 1=0");
$sth->execute;
return \@{$sth->{NAME_lc}};
}
# Returns arrayref of pk col names
sub _table_pk_info {
my ( $self, $table ) = @_;
my $dbh = $self->schema->storage->dbh;
my @primary = map { lc } $dbh->primary_key('', $self->db_schema, $table);
s/\Q$self->{_quoter}\E//g for @primary;
return \@primary;
}
# Override this for uniq info
sub _table_uniq_info {
warn "No UNIQUE constraint information can be gathered for this vendor";
return [];
}
# Find relationships
sub _table_fk_info {
my ($self, $table) = @_;
my $dbh = $self->schema->storage->dbh;
my $sth = $dbh->foreign_key_info( '', '', '', '',
$self->db_schema, $table );
return [] if !$sth;
my %rels;
my $i = 1; # for unnamed rels, which hopefully have only 1 column ...
while(my $raw_rel = $sth->fetchrow_arrayref) {
my $uk_tbl = $raw_rel->[2];
my $uk_col = lc $raw_rel->[3];
my $fk_col = lc $raw_rel->[7];
my $relid = ($raw_rel->[11] || ( "__dcsld__" . $i++ ));
$uk_tbl =~ s/\Q$self->{_quoter}\E//g;
$uk_col =~ s/\Q$self->{_quoter}\E//g;
$fk_col =~ s/\Q$self->{_quoter}\E//g;
$relid =~ s/\Q$self->{_quoter}\E//g;
$rels{$relid}->{tbl} = $uk_tbl;
$rels{$relid}->{cols}->{$uk_col} = $fk_col;
}
my @rels;
foreach my $relid (keys %rels) {
push(@rels, {
remote_columns => [ keys %{$rels{$relid}->{cols}} ],
local_columns => [ values %{$rels{$relid}->{cols}} ],
remote_table => $rels{$relid}->{tbl},
});
}
return \@rels;
}
=head1 SEE ALSO
L<DBIx::Class::Schema::Loader>
=cut
1;
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