fix connection setup for Sybase

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / Sybase / Microsoft_SQL_Server.pm

package DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server;

use strict;
use warnings;

use base qw/
  DBIx::Class::Storage::DBI::Sybase::Common
  DBIx::Class::Storage::DBI::MSSQL
/;
use mro 'c3';

sub _rebless {
  my $self = shift;
  my $dbh  = $self->_get_dbh;

  if (not $self->_typeless_placeholders_supported) {
    bless $self,
      'DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server::NoBindVars';
    $self->_rebless;
  }
}

sub _init {
  my $self = shift;

  # LongReadLen doesn't work with MSSQL through DBD::Sybase, and the default is
  # huge on some versions of SQL server and can cause memory problems, so we
  # fix it up here (see Sybase/Common.pm)
  $self->set_textsize;
}

sub _dbh_begin_work {
  my $self = shift;

  $self->_get_dbh->do('BEGIN TRAN');
}

sub _dbh_commit {
  my $self = shift;
  my $dbh  = $self->_dbh
    or $self->throw_exception('cannot COMMIT on a disconnected handle');
  $dbh->do('COMMIT');
}

sub _dbh_rollback {
  my $self = shift;
  my $dbh  = $self->_dbh
    or $self->throw_exception('cannot ROLLBACK on a disconnected handle');
  $dbh->do('ROLLBACK');
}

1;

=head1 NAME

DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server - Support for Microsoft
SQL Server via DBD::Sybase

=head1 SYNOPSIS

This subclass supports MSSQL server connections via L<DBD::Sybase>.

=head1 DESCRIPTION

This driver tries to determine whether your version of L<DBD::Sybase> and
supporting libraries (usually FreeTDS) support using placeholders, if not the
storage will be reblessed to
L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server::NoBindVars>.

The MSSQL specific functionality is provided by
L<DBIx::Class::Storage::DBI::MSSQL>.

=head1 AUTHOR

See L<DBIx::Class/CONTRIBUTORS>.

=head1 LICENSE

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

=cut