package DBIx::Class::Storage::DBI::Oracle::Generic;
# -*- mode: cperl; cperl-indent-level: 2 -*-

use strict;
use warnings;

=head1 NAME

DBIx::Class::Storage::DBI::Oracle - Automatic primary key class for Oracle

=head1 SYNOPSIS

  # In your table classes
  __PACKAGE__->load_components(qw/PK::Auto Core/);
  __PACKAGE__->set_primary_key('id');
  __PACKAGE__->sequence('mysequence');

=head1 DESCRIPTION

This class implements autoincrements for Oracle.

=head1 METHODS

=cut

use Carp::Clan qw/^DBIx::Class/;

use base qw/DBIx::Class::Storage::DBI::MultiDistinctEmulation/;

# __PACKAGE__->load_components(qw/PK::Auto/);

sub _dbh_last_insert_id {
  my ($self, $dbh, $source, $col) = @_;
  my $seq = ($source->column_info($col)->{sequence} ||= $self->get_autoinc_seq($source,$col));
  my $sql = 'SELECT ' . $seq . '.currval FROM DUAL';
  my ($id) = $dbh->selectrow_array($sql);
  return $id;
}

sub _dbh_get_autoinc_seq {
  my ($self, $dbh, $source, $col) = @_;

  # look up the correct sequence automatically
  my $sql = q{
    SELECT trigger_body FROM ALL_TRIGGERS t
    WHERE t.table_name = ?
    AND t.triggering_event = 'INSERT'
    AND t.status = 'ENABLED'
  };

  # trigger_body is a LONG
  $dbh->{LongReadLen} = 64 * 1024 if ($dbh->{LongReadLen} < 64 * 1024);

  my $sth = $dbh->prepare($sql);
  $sth->execute( uc($source->name) );
  while (my ($insert_trigger) = $sth->fetchrow_array) {
    return uc($1) if $insert_trigger =~ m!(\w+)\.nextval!i; # col name goes here???
  }
  $self->throw_exception("Unable to find a sequence INSERT trigger on table '" . $source->name . "'.");
}

=head2 get_autoinc_seq

Returns the sequence name for an autoincrement column

=cut

sub get_autoinc_seq {
  my ($self, $source, $col) = @_;
    
  $self->dbh_do($self->can('_dbh_get_autoinc_seq'), $source, $col);
}

=head2 columns_info_for

This wraps the superclass version of this method to force table
names to uppercase

=cut

sub columns_info_for {
  my ($self, $table) = @_;

  $self->next::method(uc($table));
}

=head1 AUTHORS

Andy Grundman <andy@hybridized.org>

Scott Connelly <scottsweep@yahoo.com>

=head1 LICENSE

You may distribute this code under the same terms as Perl itself.

=cut

1;