DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars - Storage::DBI subclass for

DBIx-Class documentation Contained in the DBIx-Class distribution.

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NAME

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DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars - Storage::DBI subclass for Sybase ASE without placeholder support

DESCRIPTION

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If you're using this driver then your version of Sybase or the libraries you use to connect to it do not support placeholders.

You can also enable this driver explicitly using:

  my $schema = SchemaClass->clone;
  $schema->storage_type('::DBI::Sybase::ASE::NoBindVars');
  $schema->connect($dsn, $user, $pass, \%opts);

See the discussion in Using ? Placeholders & bind parameters to $sth->execute in DBD::Sybase for details on the pros and cons of using placeholders.

One advantage of not using placeholders is that select @@identity will work for obtaining the last insert id of an IDENTITY column, instead of having to do select max(col) in a transaction as the base Sybase driver does.

When using this driver, bind variables will be interpolated (properly quoted of course) into the SQL query itself, without using placeholders.

The caching of prepared statements is also explicitly disabled, as the interpolation renders it useless.

AUTHORS

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See CONTRIBUTORS in DBIx::Class.

LICENSE

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

DBIx-Class documentation Contained in the DBIx-Class distribution. 
package DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars;

use base qw/
  DBIx::Class::Storage::DBI::NoBindVars
  DBIx::Class::Storage::DBI::Sybase::ASE
/;
use mro 'c3';
use List::Util 'first';
use Scalar::Util 'looks_like_number';
use namespace::clean;

sub _init {
  my $self = shift;
  $self->disable_sth_caching(1);
  $self->_identity_method('@@IDENTITY');
  $self->next::method (@_);
}

sub _fetch_identity_sql { 'SELECT ' . $_[0]->_identity_method }

my $number = sub { looks_like_number $_[0] };

my $decimal = sub { $_[0] =~ /^ [-+]? \d+ (?:\.\d*)? \z/x };

my %noquote = (
    int => sub { $_[0] =~ /^ [-+]? \d+ \z/x },
    bit => => sub { $_[0] =~ /^[01]\z/ },
    money => sub { $_[0] =~ /^\$ \d+ (?:\.\d*)? \z/x },
    float => $number,
    real => $number,
    double => $number,
    decimal => $decimal,
    numeric => $decimal,
);

sub interpolate_unquoted {
  my $self = shift;
  my ($type, $value) = @_;

  return $self->next::method(@_) if not defined $value or not defined $type;

  if (my $key = first { $type =~ /$_/i } keys %noquote) {
    return 1 if $noquote{$key}->($value);
  }
  elsif ($self->is_datatype_numeric($type) && $number->($value)) {
    return 1;
  }

  return $self->next::method(@_);
}

sub _prep_interpolated_value {
  my ($self, $type, $value) = @_;

  if ($type =~ /money/i && defined $value) {
    # change a ^ not followed by \$ to a \$
    $value =~ s/^ (?! \$) /\$/x;
  }

  return $value;
}

1;


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