package Parse::Dia::SQL::Output::MySQL::InnoDB;

# $Id: InnoDB.pm,v 1.4 2009/03/13 16:05:59 aff Exp $

=pod

=head1 NAME 

Parse::Dia::SQL::Output::MySQL::InnoDB - Create SQL for MySQL InnoDB.

=head1 DESCRIPTION

Note that MySQL has support for difference storage engines.  Each
storage engine has its' own properties and the respective SQL differs.

=head1 SEE ALSO

 Parse::Dia::SQL::Output
 Parse::Dia::SQL::Output::MySQL
 Parse::Dia::SQL::Output::MySQL::InnoDB

=cut

use warnings;
use strict;

use Data::Dumper;
use File::Spec::Functions qw(catfile);

use lib q{lib};
use base q{Parse::Dia::SQL::Output::MySQL};    # extends

require Parse::Dia::SQL::Logger;
require Parse::Dia::SQL::Const;

=head2 new()

The constructor.

=cut

sub new {
  my ($class, %param) = @_;
  my $self = {};

  $param{db}                    = q{mysql-innodb};
  $param{table_postfix_options} = [ 'ENGINE=InnoDB', 'DEFAULT CHARSET=latin1' ],
    $self                       = $class->SUPER::new(%param);

  bless($self, $class);

  #die "backticks:" . $self->{backticks};

  # MySQL-InnoDB only
  $self->{BACKTICK_CHAR} = q{`};

  return $self;
}

# Drop all foreign keys
sub _get_fk_drop {
  my $self   = shift;
  my $sqlstr = '';

  return unless $self->_check_associations();

  # drop fk
  foreach my $association (@{ $self->{associations} }) {
    my ($table_name, $constraint_name, undef, undef, undef, undef) =
      @{$association};

    # Add backticks to column name if option is enabled
    $table_name = $self->_quote_identifier($table_name);
    $constraint_name = $self->_quote_identifier($constraint_name);

    $sqlstr .=
        qq{alter table $table_name drop foreign key $constraint_name }
      . $self->{end_of_statement}
      . $self->{newline};
  }
  return $sqlstr;
}

# Add quotes (`backticks`) to identifier if option is set and db-type
# supports it (i.e. mysql-innodb).  Used to enclosed table name, index
# name etc with `backticks`
sub _quote_identifier {
  my ( $self, $identifier ) = @_;

  # Add backticks to column name if option is enabled
  if ($self->{backticks}) {
	$identifier =
	  $self->{BACKTICK_CHAR} . $identifier . $self->{BACKTICK_CHAR};
  }

  return $identifier;
}



1;

__END__