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ILMARI / SQL-Translator-0.11020_02 / lib / SQL / Translator / Producer.pm 

            

              
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package SQL::Translator::Producer;
use strict;
use warnings;
use Scalar::Util ();
our $VERSION = '1.59';
sub produce { "" }
# Do not rely on this if you are not bundled with SQL::Translator.
# -- rjbs, 2008-09-30
## $exceptions contains an arrayref of paired values
## Each pair contains a pattern match or string, and a value to be used as
## the default if matched.
## They are special per Producer, and provide support for the old 'now()'
## default value exceptions
sub _apply_default_value {
  my ($self, $field, $field_ref, $exceptions) = @_;
  my $default = $field->default_value;
  return if !defined $default;
  if ($exceptions and ! ref $default) {
    for (my $i = 0; $i < @$exceptions; $i += 2) {
      my ($pat, $val) = @$exceptions[ $i, $i + 1 ];
      if (ref $pat and $default =~ $pat) {
          $default = $val;
          last;
      } elsif (lc $default eq lc $pat) {
          $default = $val;
          last
      }
    }
  }
  my $type = lc $field->data_type;
  my $is_numeric_datatype = ($type =~ /^(?:(?:big|medium|small|tiny)?int(?:eger)?|decimal|double|float|num(?:ber|eric)?|real)$/);
  if (ref $default) {
      $$field_ref .= " DEFAULT $$default";
  } elsif ($is_numeric_datatype && Scalar::Util::looks_like_number ($default) ) {
    # we need to check the data itself in addition to the datatype, for basic safety
      $$field_ref .= " DEFAULT $default";
  } else {
      $default = $self->_quote_string($default);
      $$field_ref .= " DEFAULT $default";
  }
}
sub _quote_string {
    my ($self, $string) = @_;
    $string =~ s/'/''/g;
    return qq{'$string'};
}
1;
# -------------------------------------------------------------------
# A burnt child loves the fire.
# Oscar Wilde
# -------------------------------------------------------------------
=pod
=head1 NAME
SQL::Translator::Producer - describes how to write a producer
=head1 DESCRIPTION
Producer modules designed to be used with SQL::Translator need to
implement a single function, called B<produce>.  B<produce> will be
called with the SQL::Translator object from which it is expected to
retrieve the SQL::Translator::Schema object which has been populated
by the parser.  It is expected to return a string.
=head1 METHODS
=over 4
=item produce
=item create_table($table)
=item create_field($field)
=item create_view($view)
=item create_index($index)
=item create_constraint($constraint)
=item create_trigger($trigger)
=item alter_field($from_field, $to_field)
=item add_field($table, $new_field)
=item drop_field($table, $old_field)
=back
=head1 AUTHORS
Darren Chamberlain E<lt>darren@cpan.orgE<gt>,
Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
=head1 SEE ALSO
perl(1), SQL::Translator, SQL::Translator::Schema.
=cut